This assessment assumes the alignment remains within disturbed ROW, the coastal‑zone boundary is verified to confirm CDP applicability, and the project remains dependent on downstream system conditions (DG10.1) without modifying outfalls.
DG4.2 is classified as a Second‑priority equity project based on its location within a Census Block Group with an equity score of 18.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 44 Figure 7.15 CIP DG4.2
7.4.15 DG4.3
Capital Improvement Project DG4.3 consists of approximately 1650 linear feet of pipe upgrade shown below in Figure 7.16. This project is hydraulically dependent on the downstream capacity provided by DG10.1.Pipe upsizing varies along the alignment based on local hydraulic constraints. The following improvements are included in the CIP:
– Upsizing approximately 100 linear feet of existing pipe to 3-foot diameter HDPE pipe – Upsizing approximately 700 linear feet of existing pipe to 2-foot diameter HDPE pipe – Upsizing approximately 600 linear feet of existing pipe to 1-foot diameter HDPE pipe – Replacing approximately 350 linear feet of existing lateral pipes – Installing 9 new drainage inlets and 4 new manholes for maintenance access DG4.3 is anticipated to require only minimal CEQA documentation because it is standard pipe upsizing within developed ROW and outside the Coastal Zone per screening. No coastal or resource‑agency permits are anticipated if the work remains within existing disturbed corridors and avoids jurisdictional waters. This assessment assumes permitting can be bundled with DG4.2 where practical, and no outfall modifications or new discharge points are included in the scope.
DG4.3 is classified as a Second‑priority equity project based on its location within a Census Block Group with an equity score of 18.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 45 Figure 7.16 CIP DG4.3
7.4.16 DG5.1
Capital Improvement Project DG5.1 consists of approximately 4400 linear feet of pipe addition or upgrade shown below in Figure 7.17. This CIP adds a cross-town interceptor that routes the Northwestern drainage groups to Outfall
5. Pipe upsizing varies along the alignment based on local hydraulic constraints. The following improvements are included in the CIP:
– Adding approximately 2200 linear feet of 4.5-foot diameter HDPE pipe down 9th Street running West from D street to Outfall 5
– Adding approximately 600 linear feet of 4-foot diameter HDPE pipe – Adding approximately 1300 linear feet of existing pipe to 3-foot diameter HDPE pipe – Upsizing approximately 200 linear feet of existing pipe to 2.5-foot diameter HDPE pipe – Replacing approximately 100 linear feet of existing lateral pipes – Installing 8 new drainage inlets and 5 new manholes for maintenance access DG5.1 is anticipated to require CEQA Categorical Exemption but with heightened coastal review due to its downstream segment within the City Coastal Zone and proximity to coastal resources near Outfall 5. Anticipated approvals include a City CDP (potentially appealable) and supporting biological/cultural documentation if sensitive habitat (ESHA) or coastal bluff considerations are confirmed near the outfall vicinity. This assessment assumes the GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 46 interceptor is constructed within paved roadway, the existing outfall is protected in place, and coastal resource effects can be avoided or minimized through alignment and standard BMPs.
DG5.1 spans multiple Census Block Groups with equity scores of 12 and 18 and is classified as a First‑ to Second‑priority equity project.
Figure 7.17 CIP DG5.1
7.4.17 DG5.2
Capital Improvement Project DG5.2 consists of approximately 3050 linear feet of pipe upgrade shown below in Figure 7.18. This CIP addresses flooding on Pacific Ave and is hydraulically dependent on the downstream capacity provided by DG5.1. Pipe upsizing varies along the alignment based on local hydraulic constraints. The following improvements are included in the CIP:
– Upsizing approximately 900 linear feet of existing pipe to 3-foot diameter HDPE pipe – Upsizing approximately 1000 linear feet of existing pipe to 2.5-foot diameter HDPE pipe – Upsizing approximately 600 linear feet of existing pipe to 2-foot diameter HDPE pipe – Replacing approximately 550 linear feet of existing lateral pipes – Installing 14 new drainage inlets and 3 new manholes for maintenance access DG5.2 is anticipated to have minimal incremental environmental review because it is a developed ROW upsizing project that is hydraulically tied to DG5.1. Environmental compliance is expected to be addressed by bundling DG5.2 under the DG5.1 CDP and CEQA package, with no separate resource‑agency permits anticipated. This assessment GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 47 assumes DG5.2 remains outside the Coastal Zone, stays within existing ROW, and does not add outfall work or new environmental triggers beyond DG5.1.
DG5.2 spans multiple Census Block Groups with equity scores of 23, 18, and 12 and is classified as a First‑ to Fourth‑priority equity project.
Figure 7.18 CIP DG5.2
7.4.18 DG5.3
Capital Improvement Project DG5.3 consists of approximately 1500 linear feet of pipe upgrade shown below in Figure 7.19. This drainage group drains flooding in the neighborhood along Gary St. This project is hydraulically dependent on the downstream capacity provided by DG5.1. Pipe upsizing varies along the alignment based on local hydraulic constraints. The following improvements are included in the CIP:
– Upsizing approximately 1000 linear feet of existing pipe to 2.5-foot diameter HDPE pipe – Upsizing approximately 450 linear feet of existing pipe to 2-foot diameter HDPE pipe – Replacing approximately 50 linear feet of existing lateral pipes – Installing 6 new drainage inlets and 1 new manhole for maintenance access DG5.3 is anticipated to require streamlined CEQA (likely Categorical Exemption) as a developed residential ROW upsizing project dependent on DG5.1. Environmental permitting is expected to be managed through bundling with DG5.1 if the group is permitted together, with limited incremental scope added to the lead submittal. This assessment GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 48 assumes the work remains within disturbed ROW, avoids sensitive resources, and does not modify the outfall or create new coastal‑zone triggers.
DG5.3 is classified as a First‑priority equity project based on its location within a Census Block Group with an equity score of 12.
Figure 7.19 CIP DG5.3
7.4.19 DG5.4
Capital Improvement Project DG5.4 consists of approximately 3300 linear feet of pipe upgrade shown below in Figure 7.20. Pipe upsizing varies along the alignment based on local hydraulic constraints. The following improvements are included in the CIP:
– Upsizing approximately 1400 linear feet of existing pipe to 3-foot diameter HDPE pipe – Upsizing approximately 850 linear feet of existing pipe to 2.5-foot diameter HDPE pipe – Upsizing approximately 700 linear feet of existing pipe to 2-foot diameter HDPE pipe – Replacing approximately 350 linear feet of existing lateral pipes – Installing 15 new drainage inlets and 5 new manholes for maintenance access DG5.4 is anticipated to require CEQA documentation consistent with ROW improvements, with the permitting approach expected to be most efficient if bundled with the DG5 package. No standalone coastal or resource‑agency permits are anticipated based on screening if the alignment remains outside the Coastal Zone and avoids jurisdictional GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 49 waters. This assessment assumes the increased project length does not, by itself, trigger additional permits, and that DG5.4 can be included as a “ride‑along” under DG5.1’s environmental documentation where applicable.
DG5.4 is classified as a First‑priority equity project based on its location within a Census Block Group with an equity score of 12.
Figure 7.20 CIP DG5.4
7.4.20 DG5.5
Capital Improvement Project DG5.5 consists of approximately 550 linear feet of pipe upgrade shown below in Figure 7.21. This project is hydraulically dependent on the downstream capacity provided by DG5.1 and DG5.4. The following improvements are included in the CIP:
– Upsizing approximately 450 linear feet of existing pipe to 1.5-foot diameter HDPE pipe – Replacing approximately 100 linear feet of existing lateral pipes – Installing 3 new drainage inlets and 1 new manhole for maintenance access DG5.5 is anticipated to require minimal CEQA documentation (likely Categorical Exemption) because it is a small-scale developed residential ROW improvement. Environmental permitting is expected to be addressed most efficiently by bundling with DG5.1 and other DG5 CIPs, with no separate coastal or resource-agency permits anticipated. This assessment assumes the work remains fully within disturbed ROW, does not modify the outfall, and adds only minor incremental description to the bundled environmental package.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 50 DG5.5 is classified as a First‑priority equity project based on its location within a Census Block Group with an equity score of 12.
Figure 7.21 CIP DG5.5
7.4.21 DG6.1
Capital Improvement Project DG6.1 consists of approximately 650 linear feet of pipe upgrade shown below in Figure 7.22. Pipe upsizing varies along the alignment based on local hydraulic constraints. The following improvements are included in the CIP:
– Upsizing approximately 50 linear feet of existing pipe to 2-foot diameter HDPE pipe – Upsizing approximately 450 linear feet of existing pipe to 1.5-foot diameter HDPE pipe – Replacing approximately 150 linear feet of existing lateral pipes – Installing 8 new drainage inlets and 3 new manholes for maintenance access DG6.1 is anticipated to require coastal‑zone environmental review due to its location within one block of the Pacific Ocean, with CEQA documentation and a City CDP that may be appealable depending on final limits near the beach.
Additional considerations may include cultural resources review and potential tribal coordination because the Brother Jonathan Cemetery is identified as a historic/cultural resource in the project vicinity. This assessment assumes the work remains within mostly urban ROW, the existing outfall is not modified, and any cultural requirements are addressed through standard CEQA cultural screening and consultation protocols if triggered.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 51 DG6.1 spans multiple Census Block Groups with equity scores of 12 and 18 and is classified as a First‑ to Second‑priority equity project.
Figure 7.22 CIP DG6.1
7.4.22 DG7.1
Capital Improvement Project DG7.1 consists of approximately 400 linear feet of pipe upgrade shown below in Figure 7.23. This CIP repairs failed pipe sections leading to Outfall 7 and adds relief from flow to DG2.2 The following improvements are included in the CIP:
– Replace approximately 400 linear feet of existing pipe with 1-foot diameter HDPE pipe – Installing 2 new drainage inlets and 1 new manhole for maintenance access DG7.1 is anticipated to require CEQA documentation potentially at the Initial Study/Negative Declaration level due to its coastal bluff/ESHA setting and Coastal Zone location near Outfall 7. Anticipated approvals include an appealable City CDP, biological survey/ESHA verification, and potentially USACE 404 with RWQCB 401 if any portion of work is determined to occur within federal/jurisdictional areas. This assessment assumes the work is limited to pipe repair in a small footprint, the outfall is protected in place, and any separate sediment/debris cleanout seaward of the mean high tide line would be evaluated and permitted separately if pursued.
DG7.1 is classified as a Second‑priority equity project based on its location within a Census Block Group with an equity score of 18.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 52 Figure 7.23 CIP DG 7.1
7.4.23 DG8.1
Capital Improvement Project DG8.1 consists of approximately 550 linear feet of pipe upgrade shown below in Figure 7.24. The following improvements are included in the CIP:
– Adding approximately 300 linear feet of 1-foot diameter HDPE pipe connecting the corner of West 5th Street & Wendell Street to Outfall 8
– Upsizing approximately 100 linear feet of existing pipe to 2-foot diameter HDPE pipe – Replacing approximately 150 linear feet of existing lateral pipes – Installing 7 new drainage inlets and 2 new manholes for maintenance access DG8.1 is anticipated to require CEQA documentation potentially at the Initial Study/Negative Declaration level because it installs a new connection to an existing outfall within the Coastal Zone. Anticipated approvals include an appealable City CDP, biological survey/ESHA verification near the coastal bluff/outfall vicinity, and potential USACE 404/RWQCB 401 depending on the exact connection point relative to coastal jurisdictional boundaries. This assessment assumes the project connects to an existing outfall without modifying it, and that the final terminus is landward of the mean high tide line (if the connection occurs seaward, the permitting tier and agencies could escalate).
DG8.1 spans multiple Census Block Groups with equity scores of 12 and 18 and is classified as a First‑ to Second‑priority equity project.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 53 Figure 7.24 CIP DG8.1
7.4.24 DG9.1
Capital Improvement Project DG9.1 consists of approximately 700 linear feet of pipe upgrade shown below in Figure 7.25. The following improvements are included in the CIP:
– Upsizing approximately 600 linear feet of existing pipe to 2-foot diameter HDPE pipe – Replacing approximately 150 linear feet of existing lateral pipes – Installing 5 new drainage inlets and 2 new manholes for maintenance access DG9.1 is anticipated to require CEQA documentation with coastal review because the alignment lies within the Coastal Zone strip near Wendell/A Street and may intersect native vegetation near the western terminus. Anticipated approvals include an appealable City CDP and biological survey/ESHA verification, with no outfall modification assumed. This assessment assumes construction stays within existing ROW, avoids unnecessary disturbance of coastal bluff vegetation, and the existing outfall is protected in place.
DG9.1 is classified as a Second‑priority equity project based on its location within a Census Block Group with an equity score of 18.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 54 Figure 7.25 CIP DG9.1
7.4.25 DG10.1
Capital Improvement Project DG10.1 consists of approximately 600 linear feet of pipe upgrade shown below in Figure 7.26. It is recommended to protect the existing outfall in place. Pipe upsizing varies along the alignment based on local hydraulic constraints. The following improvements are included in the CIP:
– Adding approximately 300 linear feet of 4-foot diameter HDPE pipe connecting the Front Street system to Outfall 10 – Upsizing approximately 250 linear feet of existing pipe to 4-foot diameter HDPE pipe – Replacing approximately 50 linear feet of existing lateral pipes – Installing 5 new drainage inlets and 1 new manhole for maintenance access DG10.1 is anticipated to require CEQA Initial Study/Mitigated Negative Declaration‑level review because it occurs in the Beachfront Park/Elk Creek mouth corridor, which is a high‑resource setting with floodplain mapping and potential sensitive species/habitat concerns. Anticipated approvals include an appealable City CDP, biological assessment (with potential ESA/CESA considerations), possible CDFW 1602 and USACE 404/RWQCB 401 depending on any work in or near Elk Creek, a FEMA Floodplain Development Permit, and cultural resources screening (Phase I if warranted). This assessment assumes the outfall is protected in place, the design can avoid direct in‑channel work and habitat impacts to the maximum extent feasible, and permit needs will be refined once final construction limits and avoidance measures are defined during design.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 55 DG10.1 is classified as a Second‑priority equity project based on its location within a Census Block Group with an equity score of 18.
Figure 7.26 CIP DG10.1
7.5 Model Results with Proposed Improvements
To assess the efficacy of the proposed CIPs, 2D modelled flood depths and extents were generated with the assumption that all CIPs would be constructed. The figures below show the modelled 2D maximum flood depth and extent results after implementation of the proposed improvements for a 10-year, 24-hour duration SCS Type 1A storm event under present day (Figure 7.27) and the mid-century (Figure 7.28) and late century climate projections (Figure 7.29). The present-day results show a significant reduction in flood extent relative to existing conditions, however, there is a notable increase in the maximum flood extents and depths in Drainage Group 1 and Drainage Group 3 in the mid-century and late-century climate projected increase in precipitation intensity relative to present-day conditions. Table 7.1 summarized the change in flood results by drainage group between Existing Conditions and Proposed Improvements for the 10-year, 24-hour SCS Type 1A storm event for present day as well as mid-century and late-century climate projections.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 56 Figure 7.27 Flooding Extent and Depth under Proposed Condition – Present Day 10-year, 24-hour SCS Type 1A Storm GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 57 Figure 7.28 Flooding Extent and Depth under Proposed Condition – Mid-Century Climate Projection 10-year, 24-hour SCS Type 1A Storm
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 58 Figure 7.29 Flooding Extent and Depth under Proposed Condition – Late-Century Climate Projection 10-year, 24-hour SCS Type 1A Storm
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 59 Table 7.1 Comparison of Model Results between Existing Conditions and Proposed Improvements Drainag
e Group
Existing Conditions
Present Day 10-Year Storm
Event
Proposed Conditions
Present Day 10-Year Storm
Event
Proposed Conditions
Mid-Century 10-Year Storm
Event
Proposed Conditions
Late Century 10-Year Storm
Event
Total
Flood
Volum
e (MG)
Maximu
m Flood
Rate
(cfs)
Maximum
Duration
of
Flooding
(hrs)
Total
Flood
Volum
e (MG)
Maximu
m Flood
Rate
(cfs)
Maximum
Duration
of
Flooding
(hrs)
Total
Flood
Volume
(MG)
Maximu
m Flood
Rate
(cfs)
Maximu
m
Duration
of
Floodin
g (hrs)
Total
Flood
Volum
e (MG)
Maximum
Flood
Rate (cfs)
Maximu
m
Duration
of
Flooding
(hrs)
DG1 9.8 65.8 22.4 0 0 0 0 0 0 0 0.2 0
DG2 6.8 14.7 22.6 0 0.3 0.1 0.1 6.1 0.5 315.2 4679.3 3.6 DG3 20.1 19.4 23.2 7.7 19.4 23.1 10.0 20.9 23.1 80.0 5051.1 23.2 DG4 12.3 42.9 23.2 0.9 9.1 22.8 1.4 11.8 22.9 242.7 1883.8 22.9 DG5 1.9 11.4 15.7 0 10.4 0.2 0.1 12.3 0.3 0.1 13.3 0.4
DG6 0.2 5.9 2.3 0 0 0 0 0 0 0 0.1 0.1
DG7 0 0 0 0 0 0 0 0 0 0 0 0
DG8 0 1.4 0.7 0 0 0 0 0 0 0 0 0
DG9 0.1 7.1 0.8 0 0 0 0 0 0 0 0 0
DG10 0 0 0 0 0 0 0 0 0 12.0 144.2 4.9
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 60
7.6 CIP Opinion of Probable Costs
Opinions of probable construction costs were primarily estimated based on estimated quantity of storm drain pipe and catch basins and manholes added or replaced by each CIP. These quantities were also used to estimate costs associated with pipe removal, AC pavement removal, and AC pavement restoration. Traffic control, dewatering, and excavation shoring/bracing costs were also estimated. Based on the percentages of the construction subtotal, mobilization/demobilization, bonds and insurance, contractor overhead and profit, and construction contingency were estimated. Engineering services and construction management was estimated by calculating a percentage of the total probably construction cost estimate. A summary of estimated costs for opinion of probable construction, engineering/construction management, and permitting & environmental compliance for each CIP and Drainage Group is presented in Table 7.2.
Table 7.2 Cost Estimate Summary by CIP and Drainage Group Drainage Group CIP Opinion of Probable
Construction Cost
Engineering/C
onstruction
Management
Environmental
Compliance &
Permitting
Total
DG1 DG1.1 $663,000 $225,000 $10,000 $898,000
DG2
DG2.1B $1,485,000 $505,000 $5,000 $1,995,000
DG2.2 $1,236,000 $420,000 $25,000 $1,681,000
DG2.2B $863,000 $293,000 $5,000 $1,161,000
DG 2 Subtotals $3,584,000 $1,218,000 $35,000 $4,837,000 DG3
DG3.1A $2,295,000 $780,000 $60,000 $3,135,000
DG3.1B $1,560,000 $530,000 $45,000 $2,135,000
DG3.2A $1,685,000 $573,000 $3,000 $2,261,000
DG3.2B $3,545,000 $1,205,000 $50,000 $4,800,000
DG3.2C $718,000 $244,000 $80,000 $1,042,000
DG3.3A $331,000 $112,000 $60,000 $503,000
DG3.3B $1,182,000 $402,000 $50,000 $1,634,000
DG 3 Subtotals $11,316,000 $3,846,000 $348,000 $15,510,000 DG4
DG4.1A $2,409,000 $819,000 $5,000 $3,233,000
DG4.1B $1,779,000 $605,000 $2,000 $2,386,000
DG4.2 $1,280,000 $435,000 $10,000 $1,725,000
DG4.3 $1,332,000 $453,000 $3,000 $1,788,000
DG 4 Subtotals $6,800,000 $2,312,000 $20,000 $9,132,000 DG5
DG5.1 $5,390,000 $1,833,000 $40,000 $7,263,000
DG5.2 $2,277,000 $774,000 $5,000 $3,056,000
DG5.3 $1,273,000 $433,000 $5,000 $1,711,000
DG5.4 $3,024,000 $1,028,000 $8,000 $4,060,000
DG5.5 $519,000 $176,000 $2,000 $697,000
DG 5 Subtotals $12,483,000 $4,244,000 $60,000 $16,787,000 DG6 DG6.1 $942,000 $320,000 $10,000 $1,272,000
DG7 DG7.1 $243,000 $83,000 $60,000 $386,000
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 61 Drainage Group CIP Opinion of Probable
Construction Cost
Engineering/C
onstruction
Management
Environmental
Compliance &
Permitting
Total
DG8 DG8.1 $554,000 $188,000 $60,000 $802,000
DG9 DG9.1 $696,000 $237,000 $40,000 $973,000
DG10 DG10.1 $1,692,000 $575,000 $80,000 $2,347,000
8. Evaluation and Prioritization of Capital
Improvement Projects (CIP)
8.1 Prioritization Framework
To support in the development of drainage enhancement projects for the Storm Drain Master Plan, a list of project criteria has been developed to support in proposed project prioritization, and to be utilized as a tool to highlight opportunities for grant funding to support further project development. Project criteria were determined in collaboration with the City. Table 8.1 below presents the weighted project criteria.
Table 8.1 Prioritization Scoring Criteria
Prioritization
Criteria Criteria Description Evaluation Criteria Score Criteria
Scoring
Weight2
Health and Safety
Impact to Life /
Access to Critical
Roads
The risk of human life and safety
the proposed project would
mitigate. Do current flooding
extents limit access to critical
roads? Critical roads can be
roads that allow access into and
out of the City and roads for first
responders to hospitals.
Flooding extent is
reduced to shoulder of
arterials.
OR
Flooding extent is
reduced to ½ driving
lane on collector.
Meets Criteria = 1
Does not meet criteria = 0
5 Private and Public Property
Impact to Property /
Flooding near
Houses
The risk to property the
proposed project would mitigate.
Is flooding extent reduced to the
right-of-way by the proposed
project?
Flooding extent does not
intersect with private
property lines.
Meets Criteria = 1
Does not meet criteria = 0
4 Environment
2 Criteria Scoring Weight:
1 – Least Important
5 – Most Important
Data Collection → Model → Analysis → Project → Priority → Phase GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 62 Prioritization
Criteria Criteria Description Evaluation Criteria Score Criteria
Scoring
Weight2
Water Quality
Does the proposed project have
opportunities to address water
quality?
At least one catch basin
insert in proposed
project.
Meets Criteria = 1
Does not meet criteria = 0
2 Regulatory
Protected Areas
What permits are anticipated for
the project implementation?
Project is not in a
floodplain or a natural,
undisturbed area.
Meets Criteria = 1
Does not meet criteria = 0
3 Special Species
Protection (ESA
potential)
Does project have the potential
to encounter protected species?
Project is not on the
beach, does not
discharge on the beach,
or is in a natural,
undisturbed area.
Meets Criteria = 1
Does not meet criteria = 0
2 Trash Capture Opportunities to incorporate
trash capture devices.
Feasibility of installing at
least one trash capture
device within the
proposed CIP (catch
basin or pipe end).
Meets Criteria = 1
Does not meet criteria = 0
2 Feasibility
Proposed Pipe
under Pavement
Do project components cross
under pavement?
No storm drain pipes
under pavement with
flooding/surcharging
junctions.
Meets Criteria = 1
Does not meet criteria = 0
4 Existing Pipe under
Private Property
Do existing storm drain pipes run
under private property parcels?
Does the CIP propose a
redundant conveyance in City’s
right-of-way.
Existing storm drain
pipes are under private
property. Proposed CIP
provides redundant
conveyance in right-ofway.
Meets Criteria = 1
Does not meet criteria = 0
3 Infrastructure Properties
Condition Overall condition of the existing
stormwater infrastructure.
Stormwater
infrastructure in critical
condition or has
emerging issues.
1 – Critical
0.5 – Emerging
0 - Good
5 8.2 Application of Prioritization Criteria
The mitigation of flooding in one area of a drainage group could cause additional flooding in another area of a drainage group. For example, any conveyance upgrade to increase hydraulic capacity such as a larger diameter pipe in an upstream area of a drainage group could cause unintended flooding downstream. To reduce the risk of unintended flooding caused by improvements and to support the sequencing approach further illustrated in Section 9, the prioritization scoring was applied to full drainage groups as opposed to individuals CIPs within a drainage group.
The prioritization scoring based on the criteria presented in Table 8.1 was applied primarily by review of the modelling results, locations of proposed improvements, and other available GIS data:
Health and Safety – To evaluate if a potential CIP could mitigate the risk of flooding to health and safety, the maps of the drainage groups were reviewed to determine if Highway 101 or major arterials connecting residential areas to Highway 101 are present. Then under existing conditions, the modeled flood extent under a 10-year, 24-hour durations storm event in the drainage group was reviewed to determine if the flooding extends into these critical roads.
Lastly, under proposed conditions, the modeled flood extent under the same storm event was reviewed to evaluate if the change in flood extent is reduced based on the evaluation criteria above.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 63 Private and Public Property – The maps of the drainage groups were reviewed to determine if private or public property are present. Then under existing conditions, the modeled flood extent under a 10-year, 24-hour durations storm event in the drainage group was reviewed to determine if the flooding intersects with the parcels of private and public property. Lastly, under proposed conditions, the modeled flood extent under the same storm event was reviewed to evaluate if the change in flood extent is reduced based on the evaluation criteria above.
Water Quality – To determine if the CIPs within a drainage group had opportunities to improve water quality, the maps of the drainage groups were reviewed to determine the presence of one proposed catch basin. A new catch basin offers the opportunity to install a new catch basin insert designed to treat water before entering the storm drain system.
Regulatory Protected Areas – The maps of the drainage groups were reviewed to identify the presence of natural, undisturbed areas and floodplains intersecting with the potential CIPs. The permitting process for CIPs within this drainage group would take longer and be more challenging.
Special Species Protection – The maps of the drainage groups were reviewed to identify if potential CIPs were on a beach, discharge to a beach, or were in a natural, undisturbed area. Any drainage groups with CIPs that meet these criteria could require Endangered Species Act (ESA) permitting which could extend the complexity and duration of the environmental permitting process.
Trash Capture – To determine if the CIPs within a drainage group had opportunities to incorporate trash capture devices in accordance with the Trash Provisions to the NPDES Phase II MS4 permit (Section 2.2.2), the maps of the drainage groups were reviewed to determine the presence of one proposed catch basin. A new catch basin offers the opportunity to install a trash capture device.
Proposed Pipe under Pavement – The maps of the drainage groups were reviewed to identify if the potential CIPs were located in the paved right-of-way. These CIPs would be slightly more challenging to construct than CIPs in parks because they would require traffic control and patch paving.
Existing Pipe under Private Property – The maps of the drainage groups were reviewed to determine if the existing pipes ran under private property parcels and the proposed CIPs provided redundant conveyance along the City’s rightof-ways.
Condition – The maps of the drainage groups were reviewed to determine if there were existing stormwater infrastructure assessed to have emerging issues or in critical condition during field survey. Drainage groups with CIPs that propose replacement of this infrastructure scored higher in the prioritization.
8.3 CIP Prioritization Results
8.3.1 Drainage Group 1
Drainage Group 1 includes CIP DG1.1. Based on the prioritization scoring criteria, Drainage Group 1 scores 15/30. A key map of the CIP in Drainage Group 1 is presented in Figure 8.1. The summary of the weighted prioritization scoring criteria, opinion of probable construction cost, engineering/construction management cost, and permitting/environmental compliance cost is presented in Table 8.2.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 64 Figure 8.1 Drainage Group 1 – CIP Key Map
Table 8.2 Drainage Group 1 Prioritization Score
Prioritization Criteria Notes/Comments Weighted
Score
Impact to Life / Access to Critical
Roads Flooding extent reduced on Highway 101. 5
Impact to Property / Flooding near
Houses Flood extent does not intersect with private property lines. 4 Water Quality New drainage inlets offer the opportunity to install catch basin inserts. 2
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 65 Prioritization Criteria Notes/Comments Weighted
Score
Regulatory Protected Areas Proposed project drains to regulatory floodplain (Elk Creek basin). 0
Special Species Protection (ESA
potential) No outfalls on beaches. 2
Trash Capture New drainage inlets offer the opportunity to install trash capture devices. 2
Proposed Pipe under Pavement All proposed improvements are located under pavement. 0 Existing Pipe under Private Property No existing pipes are located under private property. 0 Condition All existing drainage features are in good condition. 0 TOTAL PRIORITIZATION SCORE 15/30
Opinion of Probable Construction Cost $663,000
Engineering/Construction Management $225,000
Environmental Compliance & Permitting $10,000
TOTAL COST $898,000
8.3.2 Drainage Group 2
Drainage Group 2 includes CIP DG2.1B, DG2.2, and DG2.2B. Based on the prioritization scoring criteria, Drainage Group 2 scores 21.5/30. A key map of the CIPs in Drainage Group 2 is presented in Figure 8.2. The summary of the weighted prioritization scoring criteria, opinion of probable construction cost, engineering/construction management cost, and permitting/environmental compliance cost is presented in Table 8.3.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 66 Figure 8.2 Drainage Group 2 – CIP Key Map
Table 8.3 Drainage Group 2 Prioritization Score
Prioritization Criteria Notes/Comments Weighted
Score
Impact to Life / Access to Critical
Roads
Flooding elimination on 9th St, a major arterial connecting residential areas to Highway 101. 5
Impact to Property / Flooding near
Houses Flood extent does not intersect with private property lines. 4 Water Quality New drainage inlets offer the opportunity to install catch basin inserts. 2
Regulatory Protected Areas Project does not intersect with natural, undisturbed area. 3 Special Species Protection (ESA
potential) Drainage Group discharges onto a beach. 0
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 67 Prioritization Criteria Notes/Comments Weighted
Score
Trash Capture New drainage inlets offer the opportunity to install trash capture devices. 2
Proposed Pipe under Pavement All proposed improvements are located under pavement. 0 Existing Pipe under Private Property Existing storm drain pipes are under private property.
Proposed CIP provides redundant conveyance in right-of-way. 3 Condition Some existing drainage features were assessed to have emerging issues. 2.5
TOTAL PRIORITIZATION SCORE 21.5/30
Opinion of Probable Construction Cost $3,584,000
Engineering/Construction Management $1,218,000
Environmental Compliance & Permitting $35,000
TOTAL COST $4,837,000
8.3.3 Drainage Group 3
Drainage Group 3 includes CIP DG3.1A, DG3.1B, DG3.2A, DG3.2B, DG3.2C, DG3.3A, and DG3.3B. Based on the prioritization scoring criteria, Drainage Group 3 scores 18/30. A key map of the CIPs in Drainage Group 3 is presented in Figure 8.3. The summary of the weighted prioritization scoring criteria, opinion of probable construction cost, engineering/construction management cost, and permitting/environmental compliance cost is presented in Table 8.4.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 68 Figure 8.3 Drainage Group 3 – CIP Key Map
Table 8.4 Drainage Group 3 Prioritization Score
Prioritization Criteria Notes/Comments Weighted
Score
Impact to Life / Access to Critical
Roads
Flooding extent along Highway 101 North through downtown nearly eliminated; minor flooding is projected to continue near the intersection with 5th St.
5 Impact to Property / Flooding near
Houses Flood extent does not intersect with private property lines. 4 Water Quality New drainage inlets offer the opportunity to install catch basin inserts. 2
Regulatory Protected Areas Proposed project drains to regulatory floodplain (Elk Creek basin). 0
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 69 Prioritization Criteria Notes/Comments Weighted
Score
Special Species Protection (ESA
potential) Drainage Group discharges into a natural, undisturbed area. 0 Trash Capture New drainage inlets offer the opportunity to install trash capture devices. 2
Proposed Pipe under Pavement All proposed improvements are located under pavement. 0 Existing Pipe under Private Property Existing storm drain pipes are under private property.
Proposed CIP remains under private property. 0
Condition Some existing drainage features were assessed to be in critical condition. 5
TOTAL PRIORITIZATION SCORE 18/30
Opinion of Probable Construction Cost $11,316,000
Engineering/Construction Management $3,846,000
Environmental Compliance & Permitting $348,000
TOTAL COST $15,510,000
8.3.4 Drainage Group 4
Drainage Group 4 includes CIP DG4.1A, DG4.1B, DG4.2, and DG4.3. Based on the prioritization scoring criteria, Drainage Group 4 scores 24/30. A key map of the CIPs in Drainage Group 4 is presented in Figure 8.4. The summary of the weighted prioritization scoring criteria, opinion of probable construction cost, engineering/construction management cost, and permitting/environmental compliance cost is presented in Table 8.5.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 70 Figure 8.4 Drainage Group 4 – CIP Key Map
Table 8.5 Drainage Group 4 Prioritization Score
Prioritization Criteria Notes/Comments Weighted
Score
Impact to Life / Access to Critical
Roads
Flooding extent along multiple arterials connected to Highway 101 and downtown are significantly reduced or eliminated. 5 Impact to Property / Flooding near
Houses
Flooding extent under existing conditions extensively
intersects with private property. Proposed improvements significantly reduce the flooding extent.
4 Water Quality New drainage inlets offer the opportunity to install catch basin inserts. 2
Regulatory Protected Areas Project does not intersect with natural, undisturbed area. 3 GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 71 Prioritization Criteria Notes/Comments Weighted
Score
Special Species Protection (ESA
potential) Drainage Group discharges onto a beach. 0
Trash Capture New drainage inlets offer the opportunity to install trash capture devices. 2
Proposed Pipe under Pavement All proposed improvements are located under pavement. 0 Existing Pipe under Private Property Existing storm drain pipes are under private property.
Proposed CIP provides redundant conveyance in right-of-way. 3 Condition Some existing drainage features were assessed to be in critical condition. 5
TOTAL PRIORITIZATION SCORE 24/30
Opinion of Probable Construction Cost $6,800,000
Engineering/Construction Management $2,312,000
Environmental Compliance & Permitting $20,000
TOTAL COST $9,132,000
8.3.5 Drainage Group 5
Drainage Group 5 includes CIP DG5.1, DG5.2, DG5.3, DG5.4, and DG5.5. Based on the prioritization scoring criteria, Drainage Group 5 scores 24/30. A key map of the CIPs in Drainage Group 5 is presented in Figure 8.5. The summary of the weighted prioritization scoring criteria, opinion of probable construction cost, engineering/construction management cost, and permitting/environmental compliance cost is presented in Table 8.6.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 72 Figure 8.5 Drainage Group 5 – CIP Key Map
Table 8.6 Drainage Group 5 Prioritization Score
Prioritization Criteria Notes/Comments Weighted
Score
Impact to Life / Access to Critical
Roads
Flooding elimination on 9th St, a major arterial connecting residential areas to Highway 101. Flooding is also eliminated along Pacific Ave and E St, major collectors to 9th Ave. 5 Impact to Property / Flooding near
Houses
Flooding extent under existing conditions extensively
intersects with private property. Proposed improvements significantly reduce the flooding extent.
4 Water Quality New drainage inlets offer the opportunity to install catch basin inserts. 2
Regulatory Protected Areas Project does not intersect with natural, undisturbed area. 3 GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 73 Prioritization Criteria Notes/Comments Weighted
Score
Special Species Protection (ESA
potential) Drainage Group discharges onto a beach. 0
Trash Capture New drainage inlets offer the opportunity to install trash capture devices. 2
Proposed Pipe under Pavement All proposed improvements are located under pavement. 0 Existing Pipe under Private Property
Existing storm drain pipes are under private property.
Proposed pipes provides redundant conveyance in right-ofway.3 Condition Some existing drainage features were assessed to be in critical condition. 5
TOTAL PRIORITIZATION SCORE 24/30
Opinion of Probable Construction Cost $12,483,000
Engineering/Construction Management $4,244,000
Environmental Compliance & Permitting $120,000
TOTAL COST $16,787,000
8.3.6 Drainage Group 6
Drainage Group 6 includes CIP DG6.1. Based on the prioritization scoring criteria, Drainage Group 6 scores 11/30. A key map of the CIP in Drainage Group 6 is presented in Figure 8.6. The summary of the weighted prioritization scoring criteria, opinion of probable construction cost, engineering/construction management cost, and permitting/environmental compliance cost is presented in Table 8.7.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 74 Figure 8.6 Drainage Group 6 – CIP Key Map
Table 8.7 Drainage Group 6 Prioritization Score
Prioritization Criteria Notes/Comments Weighted
Score
Impact to Life / Access to Critical
Roads
Though flooding is projected to occur under existing
conditions, there are no major arterials nor other critical roads. 0 Impact to Property / Flooding near
Houses
Proposed improvements eliminates the flooding extent
projected to intersect with private property under existing conditions
4 Water Quality New drainage inlets offer the opportunity to install catch basin inserts. 2
Regulatory Protected Areas Project does not intersect with natural, undisturbed area. 3 GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 75 Prioritization Criteria Notes/Comments Weighted
Score
Special Species Protection (ESA
potential) Drainage Group discharges onto a beach. 0
Trash Capture New drainage inlets offer the opportunity to install trash capture devices. 2
Proposed Pipe under Pavement Most proposed improvements are located under pavement. 0 Existing Pipe under Private Property
Existing pipe to outfall is aligned under private property. No proposed pipes provide redundant conveyance or realigns outfall.
0 Condition No existing infrastructure is in emerging nor critical condition. 0 TOTAL PRIORITIZATION SCORE 11/30
Opinion of Probable Construction Cost $942,000
Engineering/Construction Management $320,000
Environmental Compliance & Permitting $10,000
TOTAL COST $1,272,000
8.3.7 Drainage Group 7
Drainage Group 7 includes CIP DG7.1. Based on the prioritization scoring criteria, Drainage Group 7 scores 12/30. A key map of the CIP in Drainage Group 7 is presented in Figure 8.7. The summary of the weighted prioritization scoring criteria, opinion of probable construction cost, engineering/construction management cost, and permitting/environmental compliance cost is presented in Table 8.8.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 76 Figure 8.7 Drainage Group 7 – CIP Key Map
Table 8.8 Drainage Group 7 Prioritization Score
Prioritization Criteria Notes/Comments Weighted
Score
Impact to Life / Access to Critical
Roads No flooding is projected under existing conditions. 0 Impact to Property / Flooding near
Houses No flooding is projected under existing conditions. 0 Water Quality New drainage inlets offer the opportunity to install catch basin inserts. 2
Regulatory Protected Areas Project does not intersect with natural, undisturbed area. 3 Special Species Protection (ESA
potential) Drainage Group discharges onto a beach. 0
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 77 Prioritization Criteria Notes/Comments Weighted
Score
Trash Capture New drainage inlets offer the opportunity to install trash capture devices. 2
Proposed Pipe under Pavement Some proposed improvements are located under pavement. 0 Existing Pipe under Private Property Existing piping are located under private property. No proposed pipes provide redundant conveyance. 0
Condition Most existing infrastructure is in critical condition. 5 TOTAL PRIORITIZATION SCORE 12/30
Opinion of Probable Construction Cost $243,000
Engineering/Construction Management $83,000
Environmental Compliance & Permitting $60,000
TOTAL COST $386,000
8.3.8 Drainage Group 8
Drainage Group 8 includes CIP DG8.1. Based on the prioritization scoring criteria, Drainage Group 8 scores 16/30. A key map of the CIP in Drainage Group 8 is presented in Figure 8.8. The summary of the weighted prioritization scoring criteria, opinion of probable construction cost, engineering/construction management cost, and permitting/environmental compliance cost is presented in Table 8.9.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 78 Figure 8.8 Drainage Group 8 – CIP Key Map
Table 8.9 Drainage Group 8 Prioritization Score
Prioritization Criteria Notes/Comments Weighted
Score
Impact to Life / Access to Critical
Roads
Though flooding is projected under existing conditions, the roads are not significant arterials nor critical roads. 0 Impact to Property / Flooding near
Houses
Flooding extent is eliminated from private property under proposed conditions. 4
Water Quality New drainage inlets offer the opportunity to install catch basin inserts. 2
Regulatory Protected Areas Project does not intersect with natural, undisturbed area. 3 Special Species Protection (ESA
potential) Drainage Group discharges onto a beach. 0
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 79 Prioritization Criteria Notes/Comments Weighted
Score
Trash Capture New drainage inlets offer the opportunity to install trash capture devices. 2
Proposed Pipe under Pavement Most proposed improvements are located under pavement. 0 Existing Pipe under Private Property No existing/proposed pipes are located under private property. 0 Condition Some existing infrastructure is in critical condition. 5 TOTAL PRIORITIZATION SCORE 16/30
Opinion of Probable Construction Cost $554,000
Engineering/Construction Management $188,000
Environmental Compliance & Permitting $60,000
TOTAL COST $802,000
8.3.9 Drainage Group 9
Drainage Group 9 includes CIP DG9.1. Based on the prioritization scoring criteria, Drainage Group 9 scores 16/30. A key map of the CIP in Drainage Group 9 is presented in Figure 8.9. The summary of the weighted prioritization scoring criteria, opinion of probable construction cost, engineering/construction management cost, and permitting/environmental compliance cost is presented in Table 8.10.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 80 Figure 8.9 Drainage Group 9 – CIP Key Map
Table 8.10 Drainage Group 9 Prioritization Score
Prioritization Criteria Notes/Comments Weighted
Score
Impact to Life / Access to Critical
Roads
Though flooding is projected under existing conditions, the roads are not significant arterials nor critical roads. 0 Impact to Property / Flooding near
Houses
Flooding extent is eliminated from private property under proposed conditions. 4
Water Quality New drainage inlets offer the opportunity to install catch basin inserts. 2
Regulatory Protected Areas Project does not intersect with natural, undisturbed area. 3 Special Species Protection (ESA
potential) Drainage Group discharges onto a beach. 0
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 81 Prioritization Criteria Notes/Comments Weighted
Score
Trash Capture New drainage inlets offer the opportunity to install trash capture devices. 2
Proposed Pipe under Pavement Most proposed improvements are located under pavement. 0 Existing Pipe under Private Property No existing/proposed pipes are located under private property. 0 Condition Some existing infrastructure is in critical condition. 5 TOTAL PRIORITIZATION SCORE 16/30
Opinion of Probable Construction Cost $696,000
Engineering/Construction Management $237,000
Environmental Compliance & Permitting $40,000
TOTAL COST $973,000
8.3.10 Drainage Group 10
Drainage Group 10 includes CIP DG10.1. Based on the prioritization scoring criteria, Drainage Group 10 scores 16/30.
A key map of the CIP in Drainage Group 10 is presented in Figure 8.10. The summary of the weighted prioritization scoring criteria, opinion of probable construction cost, engineering/construction management cost, and permitting/environmental compliance cost is presented in Table 8.11.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 82 Figure 8.10 Drainage Group 10 – CIP Key Map
Table 8.11 Drainage Group 10 Prioritization Score
Prioritization Criteria Notes/Comments Weighted
Score
Impact to Life / Access to Critical
Roads
Though no flooding in drainage group is projected under existing conditions, it would be connected to Drainage Group 4 to relieve its significant flooding along arterials and critical roads under existing conditions. Flooding is nearly eliminated under proposed conditions.
5 Impact to Property / Flooding near
Houses
Flooding extent is eliminated from private property under proposed conditions. 4
Water Quality New drainage inlets offer the opportunity to install catch basin inserts. 2
Regulatory Protected Areas Project does not intersect with natural, undisturbed area. 3 Special Species Protection (ESA
potential) Drainage Group discharges onto a beach. 0
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 83 Prioritization Criteria Notes/Comments Weighted
Score
Trash Capture New drainage inlets offer the opportunity to install trash capture devices. 2
Proposed Pipe under Pavement Most proposed improvements are located under pavement. 0 Existing Pipe under Private Property No existing/proposed pipes are located under private property. 0 Condition No existing infrastructure is in critical condition or has an emerging issue. 0
TOTAL PRIORITIZATION SCORE 16/30
Opinion of Probable Construction Cost $1,692,000
Engineering/Construction Management $575,000
Permitting & Environmental Compliance $80,000
TOTAL COST $2,347,000
8.4 Summary of Prioritization Outcomes
The prioritization analysis grouped the City’s drainage groups into High, Medium, and Low priority levels based on total weighted scores derived from flooding impacts, infrastructure condition, regulatory considerations, and feasibility.
These prioritization levels provide a clear, systemwide framework for sequencing investments and focusing near‑term resources on projects that deliver the greatest benefit to public safety, property protection, and stormwater system performance. Table 8.12 presents a summary of the prioritization scoring by drainage group.
High Priority Drainage Groups
Drainage Groups 5, 2, 4, and 3 were classified as High Priority, with total scores ranging from 18 to 24. These drainage groups consistently scored high in categories related to impacts to critical roadways and access, flooding near homes, and poor or deteriorating infrastructure condition. Drainage Group 5 ranked highest overall due to extensive flooding impacts affecting both private property and major arterial corridors, combined with multiple CIPs that significantly improve system capacity. Drainage Groups 2 and 4 also scored strongly as their proposed improvements substantially reduce flooding along key transportation routes and within dense residential and commercial areas. Drainage Group 3, while subject to greater regulatory constraints and feasibility challenges, remains a high priority due to widespread flooding along Highway 101 and the presence of aging infrastructure in critical condition.
Medium Priority Drainage Groups
Drainage Groups 8, 9, 10, and 1 were identified as Medium Priority, with total scores clustering around 15 to 16.
These drainage groups generally experience localized flooding impacts that affect neighborhood streets and limited private property, but they do not consistently impact critical roadways or emergency access routes. While the proposed improvements in these areas are effective at reducing modeled flooding and often address aging infrastructure, the overall severity, extent, and consequences of flooding are lower relative to the high‑priority drainage groups. As a result, these projects are well suited for implementation in later program phases or as funding opportunities become available.
Low Priority Drainage Groups
Drainage Groups 7 and 6 were categorized as Low Priority, with the lowest total scores in the prioritization framework.
These drainage groups have relatively limited flooding impacts under existing conditions, minimal effects on critical transportation corridors or private property, and fewer infrastructure condition concerns compared to other areas of the GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 84 system. While improvements in these drainage groups provide localized benefits and may support long‑term system resiliency, they do not currently warrant near‑term implementation when compared to higher‑risk areas elsewhere in the City.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 85 Table 8.12 Drainage Group Prioritization Summary
Drainag
e Group
Weighted Prioritization Score Final Assessment
Impact to
Life /
Access to
Critical
Roads
Impact
to
Property
/
Flooding
near
Houses
Water
Quality
Regulator
y
Protected
Areas
Special
Species
Protectio
n (ESA
potential)
Trash
Capture
Proposed
Pipe
under
Pavemen
t
Existing
Pipe
under
Private
Property
Conditio
n
TOTAL
SCOR
E
Prioritizatio
n Level
DG5 5 4 2 3 0 2 0 3 5 24
HIGH
DG4 5 4 2 3 0 2 0 3 5 24
DG2 5 4 2 3 0 2 0 3 2.5 21.5
DG3 5 4 2 0 0 2 0 0 5 18
DG8 0 4 2 3 0 2 0 0 5 16
MEDIUM
DG9 0 4 2 3 0 2 0 0 5 16
DG10 5 4 2 3 0 2 0 0 0 16
DG1 5 4 2 0 2 2 0 0 0 15
DG7 0 0 2 3 0 2 0 0 5 12
LOW
DG6 0 4 2 3 0 2 0 0 0 11
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 86
9. Recommended Phasing of Capital
Improvement Program
9.1 Recommended CIP Phasing and Sequencing
The prioritization score and level assessed for each drainage group was used to inform the recommended phasing. As stated in Section 8, the prioritization was applied to full drainage groups as opposed to CIPs due to the hydraulic connectivity of CIPs within a drainage group. The recommended CIP sequencing within a drainage group phase factored in other considerations such as hydraulic constraints, constructability, and coordination with other CIPs.
The recommended drainage group phasing is divided into Near-Term (Phase A), Mid-Term (Phase B), and LongTerm (Phase C) projects.
9.1.1 Near-Term – Phase A
9.1.1.1 Drainage Group 10
CIP DG10.1 is recommended to be the first project in the Near-Term Phase. Although Drainage Group 10 was assessed to be medium priority based on the prioritization scoring criteria, the flood relief benefits of the proposed CIPs in high priority Drainage Group 2 and Drainage Group 4 are dependent on the improvements proposed under CIP DG10.1. In addition to an intertie between Drainage Group 10 and Drainage Group 2 and 4, the increase in hydraulic capacity under CIP DG10.1 would increase the downstream hydraulic capacity to convey stormwater to another outfall (OF10), providing significant relief for OF2 and OF4. Furthermore, the constructability and permitting complexity is anticipated to be lower than many other proposed CIPs and would provide the most benefit for the lowest cost compared to any other CIP.
9.1.1.2 Drainage Group 5
As the highest-ranking drainage group in the prioritization scoring (tied with Drainage Group 4), the CIPs proposed under Drainage Group 5 are recommended as the second set of projects in the Near-Term Phase. The new stormwater main along 9th St proposed under CIP DG5.1 intercepts stormwater from the upper reaches of Drainage Group 2 and 4 and re-routes it to OF5. This improvement alone would not only reduces flooding on a critical road connecting residential areas to Highway 101 (critical for health and safety/emerging vehicle access) but also provides additional flood relief to the Drainage Group 2 and 4. The existing outfall OF5 has sufficient capacity to convey the maximum projected stormwater rate from the upper reaches of these drainage groups under a 10-year, 24-hour storm event (present day). The recommended sequence of CIPs in each drainage group is primarily based on the “start downstream, then work upstream” best practice to ensure downstream capacity is sufficient for the proposed upstream improvements. However, to provide immediate flood relieve benefits to Drainage Group 4, some upstream CIPs are prioritized in the sequence. Based on this best practice and need for immediate flood relief to the downtown core (Drainage Group 4), the recommended sequencing of CIP construction in Drainage Group 5 is:
DG5.1 → DG5.2 → DG5.3 → DG5.4 → DG5.5
9.1.1.3 Drainage Group 4
As the highest-ranking drainage group in the prioritization scoring (tied with Drainage Group 5), the CIPs proposed under Drainage Group 4 are recommended as the third set of projects in the Near-Term Phase. As stated previously, Data Collection → Model → Analysis → Project → Priority → Phase GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 87 the CIPs in Drainage Group 5 are recommended for sequencing first because the projects provide of the benefits it provides for Drainage Group 4 in addition to Drainage Group 5. The improvements proposed under CIP DG 4.1A, DG4.1B, and DG4.2 would significantly reduce the remaining flooding in the downtown core and improve accessibility to and from the City’s municipal facilities such as the fire station, police department, and public works during major storm events. The reduction of flooding as much as possible in Drainage Group 4 is high priority because many arterials connecting the City to Highway 101 run through the drainage group. To ensure downstream capacity is sufficient for the proposed upstream improvements, the “start downstream, then work upstream” best practice is recommended for CIP sequencing. The recommended sequencing of CIP construction in Drainage Group 4 is:
DG4.1A → DG4.1B → DG4.2 → DG4.3
9.1.2 Mid-Term – Phase B
9.1.2.1 Drainage Group 2
As the second highest-ranking drainage group in the prioritization scoring, the CIPs proposed under Drainage Group 2 are recommended as the first set of projects in the Mid-Term Phase. As stated previously, the CIPs in Drainage Group 5 are recommended for sequencing first because the projects provide of the benefits it provides for Drainage Group 2 in addition to Drainage Group 5. The reduction of flooding as much as possible in Drainage Group 2 is high priority because many arterials connecting the City to Highway 101 run through the drainage group. Furthermore, the improvements proposed under CIP DG2.1B, DG2.2, and DG2.2B would significantly reduce the risk of flooding to private property the residential areas in Drainage Group 2. Following the best practices discussed for the sequencing of the CIPs in other drainage groups, the recommended sequencing of CIP construction in Drainage Group 2 is:
DG2.2 → DG2.1B → DG2.2B
9.1.2.2 Drainage Group 3
As the third highest-ranking drainage group in the prioritization scoring, the CIPs proposed under Drainage Group 3 are recommended as the second set of projects in the Mid-Term Phase. The CIPs proposed in Drainage Group 3 are of high priority because they would significantly reduce the flooding risk on Highway 101, which serves as a major route to the County’s primary medical facilities and for evacuation. The CIPs would also reduce flooding in residential and commercial areas along Hoover Ave and Harding Ave in the northern jurisdiction of the City and key grocery stores/pharmacies like Safeway and Rite Aid in the downtown area. The recommended sequence of CIPs in each drainage group is primarily based on the “start downstream, then work upstream” best practice to ensure downstream capacity is sufficient for the proposed upstream improvements. However, to provide immediate flood relieve benefits to Drainage Group 3, some upstream CIPs are prioritized in the sequence. The best practice approach is less critical due to interconnected natural storage areas in between sections of the drainage group (i.e. Elk Creek and its tributaries) that detain stormwater. In addition, given that the proposed CIPs could increase the quantity of stormwater contributions to these natural storage areas during a storm event and intersect with a FEMA Special Flood Hazard Area, the environmental and hydraulic permitting process is expected to be more complex and require a longer timeline. Following the best practices discussed for the sequencing of the CIPs in other drainage groups, the recommended sequencing of CIP construction in Drainage Group 3 is:
DG3.1A → DG3.1B → DG3.2A → DG3.2B → DG3.2C → DG3.3A → DG3.3B
9.1.3 Long-Term – Phase C
The CIPs in the Long-Term Phase are generally lower priority projects with significantly smaller footprints than those in the Near-Term Phase. As many of these projects can happen in parallel and are not hydraulically interdependent, the recommended sequencing of CIPs in the Long-Term Phase is:
DG1.1, DG8.1, & DG9.1 → DG6.1 → DG7.1
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 88
9.1.3.1 Drainage Group 1
CIP DG1.1 is recommended to be the first project in the Long-Term Phase. Although Drainage Group 1 was assessed to be the lowest of the medium priority drainage groups in the prioritization scoring criteria, the flood relief benefits of the proposed CIP DG1.1 would significantly reduce flooding along Highway 101, which serves as a major route to the County’s primary medical facilities and for evacuation. Given that the existing stormwater infrastructure in Drainage Group 1 is within Caltrans right-of-way, any improvements or modifications to the stormwater infrastructure falls under the jurisdiction of Caltrans. Coordination with Caltrans to advance this CIP to design and construction is recommended to occur in parallel with other projects in the Mid-Term Phase.
9.1.3.2 Drainage Group 8 and 9
Tied for the highest-ranking medium priority drainage groups, the CIP DG8.1 and CIP DG9.1 proposed under Drainage Group 8 and Drainage Group 9, respectively, are recommended to be implemented in parallel in the LongTerm Phase due their small extent and proximity to one another. Both drainage groups have existing stormwater infrastructure in poor condition and minor flooding of residential areas is observed in both drainage groups under existing conditions. However, these drainage groups ranked lower primarily due to their small catchment area, their location on the western edge of the City bordering the Pacific Ocean, and their lack of major arterials connecting residential areas to Highway 101 and the downtown core.
9.1.3.3 Drainage Group 6 and 7
As the lowest priority drainage groups, the CIPs proposed under Drainage Group 6 and Drainage Group 7 are recommended to be implemented last due to their small extent and lack of significant flooding. Although Drainage Group 7 scored 1 point higher than Drainage Group 6, the implementation of CIP DG6.1 is recommended for implementation before CIP DG7.1 because it would reduce minor flooding to residential areas. Though CIP DG7.1 would provide some minor flood relief to Drainage Group 2, the modelling results showed no flooding in Drainage Group 7 in existing conditions under a 10-year, 24-hour during storm event.
9.1.4 Summary of Recommended CIP Phasing and Sequencing The recommended phasing of CIP implementation by drainage group is summarized in Figure 9.1. The recommended sequence of CIP implementation by drainage group for Phase A is summarized in Figure 9.2. The recommended sequence of CIP implementation for Phase B is summarized in Figure 9.3. The recommended sequence of CIP implementation for Phase C is summarized in Figure 9.4.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 89 Figure 9.1 Recommended Phasing of CIP Implementation by Drainage Group Figure 9.2 Phase A – Recommended Sequence of CIP Implementation GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 90 Figure 9.3 Phase B – Recommended Sequence of CIP Implementation Figure 9.4 Phase C – Recommended Sequence of CIP Implementation
9.2 Conclusion and Recommendations
This Storm Drain Master Plan provides Crescent City with a robust framework for understanding existing stormwater system performance, identifying drainage deficiencies, and guiding long‑term capital investment decisions. Through extensive field data collection, development of a citywide hydrologic and hydraulic model, and evaluation of existing and future climate‑informed design storms, the study documents the locations, causes, and consequences of flooding across the City’s drainage system.
The analyses confirm that flooding in Crescent City is driven by a combination of flat coastal topography, tidally influenced outfalls, undersized and aging infrastructure, and increasing precipitation intensity. Flooding impacts are most pronounced along critical transportation corridors, including Highway 101 and major arterials, as well as within older residential and commercial areas where limited hydraulic capacity and degraded infrastructure reduce system performance. The modeling results demonstrate that these vulnerabilities are expected to become more severe under mid‑ and late‑century climate conditions if no improvements are implemented.
To address these challenges, the Master Plan identifies a set of CIPs developed through a deficiency analysis and refined through iterative modeling. The proposed projects collectively provide substantial reductions in flood extent, depth, and duration under present‑day design storms and meaningfully improve system resilience under projected future conditions. The prioritization framework established in this plan integrates flooding impacts, public safety, infrastructure condition, regulatory considerations, feasibility, and equity to ensure that the most critical needs are addressed first.
Based on the prioritization results and hydraulic interdependencies, the recommended phasing strategy organizes implementation into near‑term, mid‑term, and long‑term phases. This sequencing emphasizes early construction of projects that unlock downstream capacity, provide systemwide benefits, and reduce flooding along critical access routes and in high‑risk neighborhoods. The accompanying planning‑level cost estimates establish a realistic capital investment outlook and provide a foundation for budgeting, grant applications, and coordination with partnering agencies.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 91 Overall, this Master Plan equips Crescent City with a clear, flexible roadmap to incrementally improve stormwater system performance, reduce flood risk to people and property, support regulatory compliance, and enhance long‑term climate resilience. As projects advance to design and construction, continued model refinement, coordination with regulatory agencies, and periodic updates to the Master Plan are recommended to incorporate new data, completed improvements, and evolving climate and funding conditions.
Based on the work conducted to prepare this Master Plan, the City should consider these additional planning documents in the future:
CIP Implementation & Funding Strategy
A focused implementation plan would refine the prioritized CIP list by identifying near‑term funding opportunities (e.g., grants, loans, cost‑sharing), project delivery approaches, and permitting pathways. This would help the City move efficiently from planning to design and construction.
Climate Adaptation & Flood Resilience Plan
A standalone resilience plan could expand on the climate change analysis by integrating sea level rise, compound flooding (rainfall & tides), emergency access, and community vulnerability. This document would also strengthen eligibility for state and federal resilience funding.
Storm Drainage Inventory Asset Management Plan
Use the drainage inventory database from this CIP to create an asset management plan that proactively rehabilitates and replaces infrastructure, preventing emergency failures. The plan should detail documentation, assessment, and maintenance of stormwater systems (pipes, culverts, catch basins) for long-term function and financial stability.
Periodic Master Plan Update (5–10 Years)
Finally, the City should plan for periodic updates to the Storm Drain System Master Plan to incorporate completed CIPs, refined cost estimates, updated climate projections, new development, and additional field data.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 92 GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 93 Appendices
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 94 Appendix A
Assumptions
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 95 Assumptions made to prepare the Hydrology and Hydraulics (H&H) analysis to develop the CIPs include outfall conditions and reliance on the accuracy of the GPS equipment used in field data collection. Outfall boundary conditions and assumptions are further described below in Section D-3.
The accuracy of the model results is dependent on the accuracy of the provided data for the planned and in construction elements. The preliminary existing storm drainage infrastructure data was utilized to locate the existing storm drainage infrastructure during field data collection and was expanded upon. See Table 9.1 below for the received data utilized in the development of the H&H analysis.
Table 9.1 Flow routing metadata
Name Description File Type Source
2006-02 Drain Basin 500
Study
List of drainage inlet locations and depths
for the K-Street Outfall (Outfall 2)
.xls City of Crescent City
2013-06 Drainage Study Drainage study near C St memorandum, volumes, and location maps.
.dwg; .pdf By Mike Young, provided by
City of Crescent City
2014-06-18 Drainage Survey
for Augustine Meeting
Further assessment of drainage study on
C St.
.xls; .dwg; .pdf By Mike Young, provided by
City of Crescent City
Historic ‘as-builts’ of Storm
Drain Infrastructure
Piecewise hand-drawn as-builts of storm
drain infrastructure from 1965 – 2013
.pdf City of Crescent City
MS4 Permit Most recent MS4 Permit .pdf City of Crescent City As-builts and plans of Front
St., C St., D St., and F St.
Planned and partially in-construction
drainage improvement projects to take
place on Front St., C St., D St., and F St.
.pdf City of Crescent City
As-builts of Harding St.
Culvert
As-builts of Harding Ave Culvert Repair
Project
.pdf City of Crescent City
Storm Drain Capacity
Analysis 3rd St Drainage from
J to K St.
Rational Method analysis assessing the
existing storm drainage capacity on 3rd St.
from J to K St.
.xls City of Crescent City
2024.02.23 Front Street Play
to L Plans
Plans for storm drain infrastructure
projects on Front Street.
.pdf City of Crescent City
City Priority Criteria A ranked list of criteria the City wants considered in project development and
prioritization.
.docx City of Crescent City
Critical Facilities A shape file delineating buildings of high importance to the City.
.shp City of Crescent City
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 96 Appendix B
Equity Analysis
Technical Memorandum
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way.
The Power of Commitment
12588710 1
May 01, 2026
To James Queen, City of Crescent City Contact No. 707-267-2202 Copy to n/a Email [email protected]
From Amber Shows, GHD Project No. 12588710
Project Name Crescent City Storm Drain Master Plan
Subject Equity Analysis
1. Introduction
Understanding the locations of and impacts to disadvantaged populations and communities with equity concerns is an important aspect of city planning in general and is necessary to be in alignment with the ultimate goal of supporting communities to not only survive, but to thrive.
This Equity Analysis applied data analysis and geospatial mapping tools to public data to provide a contextual presentation of disadvantaged1 populations and communities with equity concerns, including physical and socioeconomic vulnerabilities (see Section 4). Opportunities for further analysis include the refined hydraulic and hydrologic model outputs of existing flood risk and the proportional population density of block groups that were used in this analysis. Population density across block groups can be obtained for a fee from the Del Norte County Assessor’s office.
1.1 Purpose of this Memorandum
This Equity Analysis report is designed to fulfill the agreed-upon deliverable requirement set forth in the Storm Drain Master Plan It is designed to provide an input for decision-making as deemed appropriate by the City and provide an additional level of refinement to the understanding of social equity in Crescent City, which meets state and federal definitions of disadvantaged at the city- and census block-group- levels. The results of this analysis will be referenced during storm drain improvement project prioritization to ensure equitable distribution of project benefits.
1 Disadvantaged as defined in accordance with Final Designation of Disadvantaged Communities Pursuant to Senate Bill 535. May 2022. *Final Designation of Disadvantaged Communities Pursuant to SB535, 2022 (ca.gov). Accessed 3/26/2024. More information: LowIncome or Disadvantaged Communities Designated by California - Dataset - California Natural Resources Agency Open Data.
Accessed 3/26/2024.
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 2
2. Assumptions
The assumptions for this deliverable are listed below.
• Population distribution is assumed to be uniform through the block group. • Prioritization based on equity analytics was done before the hydraulic model was developed and hence does not consider the findings of the existing conditions hydraulic model. • American Community Survey demographic data comes from surveys which have some inherent measuring error built in due to it not being a full census of all households. For example, estimates of low-income percentage for a particular block group could be inaccurate.
3. Background
The Federal government has made it a goal that 40 percent of the overall benefits of certain Federal climate, clean energy, affordable and sustainable housing, and other investments flow to disadvantaged communities that are marginalized by underinvestment and overburdened by pollution. This commitment was made through Executive Order (EO) 14008, “Tackling the Climate Crisis at Home and Abroad” and EO 14096, “Revitalizing Our Nation’s Commitment to Environmental Justice for All”. These goals are expressed through the “Justice40 Initiative”. EO 14008 references the term “disadvantaged communities,” which has been used in existing federal and California state programs to prioritize funding for environmental justice.2 Similarly, through grants, programs, and funding, the Inflation Reduction Act (IRA) makes investments in climate action that are designed to reduce U.S. greenhouse gas emissions approximately 40% by 2030 with a focus on tackling climate pollution, advancing environmental justice, and delivering clean air.3,4 Justice40 defines overburdened and underserved communities as disadvantaged at the census tract-level.
Communities are considered disadvantaged if they are:
• in census tracts that meet the thresholds for at least one category of burden, or • on land within the boundaries of Federally Recognized Tribes.
This designation is based on an analysis of burdens at thresholds using percentiles in comparison to the US population. The Justice40 initiative supplies a geospatial tool which provides the determination based on census tract data. The Climate and Economic Justice Screening Tool (CEJST) uses datasets as indicators of burdens. The burdens are organized into categories. A community is highlighted as disadvantaged on the CEJST map if it is in a census tract that is (1) at or above the threshold for one or more environmental, climate, or other burdens, and (2) at or above the threshold for an associated socioeconomic burden5. In addition, a census tract that is completely surrounded by disadvantaged communities and is at or above the 50% percentile for low income is also considered disadvantaged.
The Environmental and Climate Justice Program (ECJ Program), created by the IRA, provides funding for financial and technical assistance to carry out environmental and climate justice activities to benefit disadvantaged communities. The US Environmental Protection Agency (EPA) has created the EPA IRA Disadvantaged Communities map layer to assist potential applicants seeking to identify whether a community 2 Disadvantaged Communities Nomenclature Within the State of California: Findings and Conclusions — A Recommendation Document. Accessed on 4/9/2024. 3 Inflation Reduction Act | US EPA. Accessed 4/9/2024. 4 Inflation Reduction Act Overview (epa.gov). Accessed 4/9/2024. 5 Methodology & data - Climate & Economic Justice Screening Tool (geoplatform.gov). This link provides definitions for categories of burdens and percentile thresholds under Justice40 criteria depicted in CEJST.
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 3
is disadvantaged for the purposes of implementing programs under the IRA. The EPA IRA Disadvantaged Communities map combines multiple datasets that individually can be used to determine whether a community is disadvantaged for the purposes of implementing programs under the IRA. All data sets are assigned values at the Census block group level. The criteria and associated datasets used in the map are:6 • Any census tract that is included as disadvantaged in the CEJST. • Any census block group at or above the 90th percentile for any of US EPA’s Environmental Justice Screening Tool (EJScreen) Supplemental Indexes when compared to the nation or state, • and/or any of the following geographic areas within the Tribal lands category in EJScreen:
o Alaska Native Allotments
o Alaska Native Villages
o American Indian Reservations
o American Indian Off-reservation Trust Lands
o Oklahoma Tribal Statistical Areas
The supplemental indexes are a combination of EJScreen’s socioeconomic and environmental indicators calculated at the census block group-level and provide flexibility and additional functionality to the EJScreen tool for use in specific situations, including obtaining grant funding.
The state of California set forth indicators, thresholds, and definitions for the determination of disadvantaged populations and disadvantaged communities (DACs) through Assembly Bill (AB) 1550 and Senate Bill (SB) 535.7 AB 1550 defines “low-income” as 80% of the California median income. Under California water code 79505.5 a Small Disadvantaged Community refers to a Disadvantaged Community that has a year-long population of no more than 10,000 persons and a combined median household income (MHI) of less than 80% of the state MHI and a Severely Disadvantaged Community (SDAC) has a population under 10,000 and a combined MHI under 60% of the statewide MHI 8.
DAC definitions and thresholds are as follows:
• Low-Income or Disadvantaged Communities:
o These are census tracts with median household incomes at or below 80 percent of the statewide median income.
o They can also include areas with incomes below the threshold designated as low income by the Department of Housing and Community Development.
o Additionally, census tracts receiving the highest 25 percent of overall scores in CalEnviroScreen 4.0 fall into this category.
o Even census tracts lacking overall scores in CalEnviroScreen 4.0 due to data gaps but receiving the highest 5 percent of cumulative population burden scores are considered disadvantaged.
o Lands under the control of federally recognized Tribes are also part of this designation.9 • Income Thresholds:
o A (DAC) in California is defined as a community with an annual median household income less than 80% of the statewide annual median household income. o A Severely Disadvantaged Community has a median household income below 60% of the statewide average.10
6 Inflation Reduction Act Disadvantaged Communities Map | US EPA. Accessed 4/9/2024. 7 SB 535 Disadvantaged Communities | OEHHA (ca.gov). Accessed 4/9/2024. 8 Disadvantaged Communities in Northern California (norcalwater.org). Accessed 4/9/2024. 9 Low-Income or Disadvantaged Communities Designated by California - Dataset - California Open Data. Accessed 4/9/2024. 10 California Disadvantaged Communities Mapping Tool | Adaptation Clearinghouse. Accessed 4/9/2024.
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 4
Crescent city has 3 zip codes and 5 main block groups, most of which lie partially within the city boundary, as illustrated in Figure 1 (below).
Figure 1 Crescent City Boundary and Census Block Groups This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 5
Crescent City meets the California definition of a small, disadvantaged community as defined under California water code 79505.511 and is considered low-income in accordance with state definitions as defined by AB 155012 as well as qualifying as disadvantaged under the Justice40 and IRA Disadvantaged Communities definitions at the census block group-level (for all block groups that intersect with the city boundaries), as depicted in the table below13 (see also Attachment 1).
Table 1 Justice40 and IRA Designations by Block Group
Block Group Justice40 IRA
060150001011 Disadvantaged Disadvantaged
060150001022 Disadvantaged Disadvantaged
060150001072 Disadvantaged Disadvantaged
060150001012 Disadvantaged Disadvantaged
060150001021 Disadvantaged Disadvantaged
The “disadvantaged” designations are important for determinations of eligibility for grant funding through Justice40 and IRA Federal agency administered programs as well as through state agencies. However, additional detailed analysis was conducted to provide a higher level of refinement to the understanding of social equity in Crescent City so that the findings may be used to support project-specific decision-making. The results of this analysis will be referenced during storm drain improvement project prioritization to ensure equitable distribution of project benefits.
4. Definitions and References
For the purposes of this analysis, California state and US federal data sources and references were used.
Analyses were performed at the US census block group-level. Statistical analysis and subsequent scoring were performed for an entire block group, even if that block group only partially resides within the City boundary (see Figure 1, Section 6).
A demographic index was calculated for block groups applying socioeconomic indicators to determine the location and concentration of populations with equity concerns in comparison to the California state mean. The indicators comprising the demographic index are in alignment with the socioeconomic indicators recognized by the US EPA14 for environmental, economic, and climate justice screening (see Table 1). Additional selected and relevant potential environmental release and exposure indicators and social and economic vulnerability indicators were then considered to further refine the context and help identify the vulnerabilities of the communities with equity concerns identified at the block group level in Crescent City. Potential flood-related climate hazards were also briefly reviewed and qualitative information was provided.
The following table provides the definitions, reference areas, and data sources applied and used for indicator comparison and index calculation and climate hazard review. 11 California Small Disadvantaged Community is a community with no more than 10,000 persons with a combined mean household income (MHI) of less than 80% of the state MHI. Low-Income or Disadvantaged Communities Designated by California - Dataset - California Natural Resources Agency Open Data. Accessed 3/27/2024 12 Priority Populations 2023 (ca.gov) 13 Explore the map - Climate & Economic Justice Screening Tool (geoplatform.gov) 14 Based on the US EPA’s Screening and Mapping Tool EJScreen (epa.gov) demographic and supplemental indexes as defined in EJScreen Technical Documentation, October 2022. https://www.epa.gov/sites/default/files/2021- 04/documents/ejscreen_technical_document.pdf Accessed 3/26/2024 This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 6
Table 2 Demographic Index Scoring and External Vulnerabilities and Hazards Considered Indicator/Index/Hazard Definition Reference Area Data Source Demographic Index Scoring
People of color Individuals who listed their
racial status as a race
other than white alone
and/or as Latino or
Hispanic. The word
"alone" in this case
indicates that the person
is of a single race, not
multiracial.
Percentage of people of
color in the block group
The United States (US)
Environmental Protection
Agency (EPA) Screening
and Mapping Tool15 (from
American Community
Survey16)
Low-income Households with income
levels less than 200% of
the Federal Poverty Level
(FPL)
Percentage of households in
the block group with incomes
less than 200% of the FPL
(by household) in the block
group
EJScreen15
Over age 64 Percentage of the
population over age 64
Percentage people over age
64 in the block group
EJScreen15
Under age 5 Percentage of the
population under age 5
Percentage people under
age 5 in the block group
EJScreen15
Less than high school
education
Percentage of the
population age 25 or older
with less than a high
school education
Percent of people age 25 or
older in a block group whose
education is short of a high
school diploma in the block
group
EJScreen15
Low Life Expectancy Low Life Expectancy—
Life Expectancy at Birth
from Centers for Disease
Control and Prevention
(CDC), National Center
for Health Statistics
(NCHS): % Low Life
Expectancy is defined as
“1 – (Life Expectancy /
Max Life Expectancy
Percent of people in the
block group with a life
expectancy at or below the
30th percentile of the US
EJScreen (from National
Vital Statistics System17)
Demographic Index Calculated index score of
the demographic
indicators above
Calculated for each block
group
Indicator inputs
Environmental Release and Exposure Indicators
Underground storage tank
(UST) locations
Underground Storage
Tank system is a tank and
any underground piping
connected to the tank that
has at least 10 percent of
its combined volume
underground. The federal
UST regulations apply
only to UST systems
storing either petroleum or
Count applied at the block
group level
EJScreen (Calculated
from EPA UST Finder18)
15 EJScreen (epa.gov) 16 The data can be downloaded from the US Census Bureau’s FTP Server. 17 NVSS - National Vital Statistics System Homepage (cdc.gov). Accessed on 4/9/2024. 18 Calculated from EPA UST Finder, retrieved 2/2/2023 This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 7
Indicator/Index/Hazard Definition Reference Area Data Source certain hazardous
substances.
Traffic proximity and
volume
Count of vehicles
(“AADT”, avg. annual
daily traffic) at major
roads within 500 meters,
divided by distance in
meters (not km). Indicator
for potential safety and air
quality exposures.
Count applied at the block
group level
EJScreen (Department of
Transportation traffic
data19)
Social and Economic Indicators
Renter-occupancy Count of renter-occupied
households. Functions as
an indicator of housing
burden and economic
burden
Count applied at the block
group level
American Community
Survey20
Physical Climate Hazards
Flood Zone Boundaries Shows boundary lines of
flood zones
This category is comprised of
100-year annual chance
flood event hazard
boundaries
FEMA21
Sea Level Rise Sea level rise
risk signifies the overall
risk of inundation from
projected sea level rise
between one to six feet
over the next ~90 years.
The indicator represents
the possibility of
inundation based upon
the combined projections
at each stage of sea level
rise and could vary
depending upon future
circumstances. A high
rank indicates a
community more
vulnerable to sea level
rise.
Reviewed at the City-level NOAA Fisheries
Community Social
Vulnerability Index (CSVI)22
Commercial activity Count of unemployed
adults and the total
number of low-income
individuals
A combined indicator
consisting of unemployed
people in the block group
plus the total number of lowincome individuals in the
block group
EJScreen15
19 Data Inventory | US Department of Transportation, Accessed on 4/9/2024 20 The data can be downloaded from the US Census Bureau’s FTP Server. 21 Hazus | FEMA.gov. Accessed 4/9/2024. 22 Social Indicators Tool (noaa.gov), accessed 3/27/2024.
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 8
5. Methodologies
5.1 Demographic Index Statistical Methodology
The demographic index is the scoring mechanism used to identify communities with equity concerns within the City. Scores are typically calculated at the US census block group level using the following approach.
Each demographic variable (indicator value) is normalized using the z-score formula for each variable in the block group:
(x-μ)/σ
Where,
X is the variable value in the block group
μ is the mean of that variable across all block groups in the region (for the Crescent City analysis the state of California was used)
σ is the standard deviation
Normalized demographic variable values are then added together to calculate the demographic index (consisting of the normalized demographic indicator values).
5.2 Scoring Methodology
Demographic index scores are provided to reflect the socioeconomic characteristics of the population in a particular block group. The index also anonymizes the data to support protection of individual privacy. This score provides a relative measure against the California mean for each indicator comprising the demographic index (see Table 2) and are descriptively ranked relative to one another. The demographic index scoring scale is presented in Table 3.
Table 3 Demographic Index Scoring Scale
Score Range* Definition Rank
2.97 – 3.31 Higher Level of Potential
Social Vulnerability 1
2.39 – 2.96 2
1.30 – 2.39 3
0.56 – 1.29 4
0 – 0.55 Lower Level of Potential
Social Vulnerability 5
* – where a score of 0 is the California mean and the range is based on the distribution of the scores When interpreting the demographic index score, a score above zero indicates that the block group exhibits a higher level of social vulnerability - as it is represented by the calculated demographic index - than the average in California. As scores increase, the level of relative social vulnerability - as it is represented by the indicators comprising the demographic index - increases.23
23 The intent of this ranking is to provide more stratification and granularity to the available data for the purposes of descriptive clarity.
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 9
To provide additional descriptive analyses, the following environmental and socioeconomic indicators were reviewed:
• Underground storage tank locations – potential environmental release exposure events, legacy pollution
• Traffic proximity and volume – potential air quality exposure and public safety concerns, legacy pollution, displacement
• Renter-occupancy – potential economic and social vulnerability, housing burden • Commercial activity – potential economic vulnerability Underground storage tank locations were reviewed due to the potential for environmental release, and traffic proximity and volume were reviewed as an indicator of pollution burden and public safety. Renter occupancy and commercial activity provide additional information about socioeconomic conditions and potential vulnerabilities. Supplemental indicator selection is based on standard indicators for environmental and economic justice screening24 and as indicative of issues which are potentially relevant to the activity of storm drain planning and management. In addition, the following climate-related hazards were reviewed based on available public data:
• Flod risk areas – potential climate hazard, property damage, and public safety hazard • Flood zone boundaries – potential climate and public safety hazard • Sea level rise (SLR) – potential climate hazard, property damage, economic burden
Flood hazards and risks along with SLR were briefly reviewed based on public data sets due to the coastal location of Crescent City and the riverine flood risk of Del Norte County.25 Because flood risk and hazard determinations may require hydrologic model inputs for planning applications, a brief overview of findings was provided for informational purposes but is not inclusive of site-specific hydrologic model data or historical data.26
25 National Risk Index | FEMA.gov. Accessed 3/26/2024. 26 Climate-related hazards were not included in the cumulative scores provided in Section 7 but a map of SFHA zones with demographic scores was provided.
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 10
The figure below provides the results of the demographic index scoring by block group. Block group 060150001012 received the highest demographic index score, indicating the highest levels of potential socioeconomic vulnerability, as it is represented in the demographic index, to populations residing in the block group. Block groups 060150001021, 060150001011, 060150001072, 060150001022 are partially within the City boundaries. These block groups have lower scores, which means they are closer to the California mean and descriptively have progressively lower levels of potential social vulnerability relative to one another, as social vulnerability is represented in the combination of indicators described above (see Table 2).
Figure 2 Demographic Index Score by Block Group
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 11
6. Crescent City Community Information
As part of the equity analysis, socioeconomic and environmental characteristics were reviewed and documented to support a contextual understanding of the conditions relevant to social equity in the City. A brief summary of findings is presented in this section.
6.1 Social and Economic Indicators
Table 4 presents socioeconomic data for Cresent City, including relevant population data, age, rates of owneroccupied housing units, and income levels in comparison to Del Norte County and California state statistics.
Table 4 Socioeconomic Statistics Summary
Socioeconomic Statistic27, 28, 29 Crescent City Del Norte County California State People and Population
Population Estimates, July 1, 2022 5,983 27,112 39,040,616 Persons less than age 5 2.90% 4.90% 5.50%
Persons less than age 18 12.30% 20.90% 21.80%
Persons over age 64 14% 19.4% 15.8%
Race and Ethnicity30
People of Color 46% 40% 61% (average)
Housing
Owner-occupied housing unit rate,
2018-2022
36.50% 68.10% 55.60%
Households, 2018-2022 2,029 9,530 13,315,822
Income and Poverty
Median household income (in 2022
dollars), 2018-2022
$ 39,812 $ 61,149 $ 91,905
Persons in poverty, percent, 2022 22.70% 16.50% 12.20%
Health
Persons with disabilities, 2022 22.2% 19.3% 11.7%
Employment and Labor Force
Employment Rate, 2022 29.7% 44.6% 60%
The NOAA Fisheries Social Indicators for Coastal Communities were also reviewed for Crescent City, to gain context and understanding of potential areas of socioeconomic social vulnerability in the City. Indicators for poverty, personal disruption, and labor force structure scored high in vulnerability, while indicators for retiree migration and housing characteristics scored medium-high31 on the community social vulnerability index (CSVI) scale. These indicators reflect the comparison statistics presented in Table 4, indicating higher than average levels of poverty and unemployment along with housing burden, which cn contribute to migration and personal disruption.32,33
6.2 Environmental Release and Exposure Indicators
The table below provides the values for environmental release and exposure sources at the city-level for Crescent City in comparison to California state and national percentiles. 27 https://www.census.gov/quickfacts/fact/table/CA,delnortecountycalifornia,crescentcitycitycalifornia/PST045223 28 Del Norte County, California - Census Bureau Profile. Accessed 3/26/2024. 29 Crescent City city, California - Census Bureau Profile. Accessed 3/26/2024 30 See attachment 1 to this memo: EJScreen Community Reports for Del Norte County and Crescent City. 31 NOAA Fisheries CSVI scoring scale: High, Medium-High, Medium, Low; NA – does not apply This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 12
Environmental Release and
Exposure Sources Value State Average
Percentile in
State
US
Average
Percentile in
US
Particulate Matter (μg/m3) 5.85 8.65 6 8.08 7
Ozone (ppb) 44.5 65.9 0 61.6 0
Diesel Particulate Matter (μg/m3) 0.03 0.26 1 0.26 1
Air Toxics Cancer Risk (lifetime
risk per million) 20 27 1 25 1
Air Toxics Respiratory Hazard
Index 0.20 0.34 2 0.31 4
Toxic Releases to Air 0.36 780 6 4,600 3
Traffic Proximity (daily traffic
count/distance to road) 41 510 16 210 36
Lead Paint (% pre-1960 housing) 0.28 0.31 54 0.3 56
Superfund Proximity (site count/km
distance) 0.01 0.17 1 0.13 6
RMP Facility Proximity (facility
count/km distance) 0.011 0.57 0 0.43 0
Hazardous Waste Proximity (facility
count/km distance) 0.19 5.9 6 1.9 34
Underground Storage Tanks
(count/km2) 2.2 1.5 78 3.9 60
The values and percentiles for pollution and sources indicators may vary substantially at the block group level, so environmental indicators selected for the equity analysis were examined at the block group level.
6.3 Key Takeaways
Crescent city, as a whole and at the block group level, is considered disadvantaged in accordance with AB 1550 and California water code 79505.5 state definitions and Justice40 and IRA federal definitions (see also Attachment 1).34,35 In addition, the City exhibits higher levels of social vulnerability when compared to the state, based on the indicators reviewed. Poverty and unemployment exceed state and county levels, and the NOAA Fisheries CSVI identifies the City at a high level of vulnerability for personal disruption, labor force structure, and housing characteristics.
32 Social Indicators Tool (noaa.gov). Accessed 3/26/2024 33 Definitions for NOAA Fisheries indicators may be found here: Social Indicators for Coastal Communities | NOAA Fisheries 34 California Small Disadvantaged Community is a community with no more than 10,000 persons with a combined mean household income (MHI) of less than 80% of the state MHI. Low-Income or Disadvantaged Communities Designated by California - Dataset - California Natural Resources Agency Open Data. Accessed 3/27/2024 35 Explore the map - Climate & Economic Justice Screening Tool (geoplatform.gov). Accessed 3/27/2024 This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 13
7. Demographic Index Scoring
The demographic index described in the previous sections was calculated at the block group level and the scores are provided in the table below. Because the analysis was performed by census block group, the calculated land area that lies within the City boundaries was provided for each block group. However, population clustering and distribution data was not integrated into the analysis so straight ratios of population to land area may not accurately reflect population and household distribution.
Table 5 Calculated and Ranked Demographic Index per Block Group with Population Rank Block Group Number Score* Population Number of
Households
Population
Density+
Land area
within the City
Boundary (%)
3 060150001011 2.39 1,987 893 2.2 34%
1 060150001012 3.31 2,241 995 2.3 98%
2 060150001021 2.96 2,074 543 3.8 38%
5 060150001022 0.55 1,747 663 2.6 5%
4 060150001072 1.29 1,907 685 2.8 7%
* = where 0 is the California mean
+ = population (count)/number of households
All the block groups which comprise the City meet the Justice40 and US EPA Inflation Reduction Act (IRA) Disadvantaged Communities definition (see Attachment 1), therefore, differentiating based on the additional indicators included in the calculated demographic index provides clarification on relative scores of each block group compared to one another. Block group 060150001012 received the highest demographic index score, indicating the highest levels of potential socioeconomic vulnerability, as it is represented in the demographic index, to populations residing in the block group. Ninety-eight percent (98%) of the geographic area of block group 060150001012 is located within the City boundaries.
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 14
The data analyses were performed at the block group level (due to availability) and population is not necessarily equally distributed throughout the block group area, therefore, the percentage of the geographic area of the block group residing within the City boundaries was calculated for reference and is presented on Figure 3 (below) (see also Table 5).
Figure 3 Percentage of Census Block Group Land Area within City Boundaries Population density for each block group is a relevant consideration for planning and prioritization; however, areas of low population density and household count may be disadvantaged due to historical legacies of colocation of under-resourced communities with industrial zoning. The figures below provide population density information in the form of household density for each block group within the city boundaries (full and partial) (Figure 4) and the mean number of residents per household by block group (Figure 5).
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 15
Figure 4 Density of Households by Block Group
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 16
Figure 5 Residents per Household by Block Group
Renter occupancy may be an indicator of economic and social vulnerability and housing burden, where lower levels of residential homeownership may indicate higher levels of vulnerability and burden. The renter occupancy percentages by block group are presented in Table 6 (below). The renter occupancy percentages in Table 6 represent the statistic for entire geographic area that comprises the associated census block group.
Table 6 Renter Occupancy by Block Group
Block Group Percentage of
Renter Occupancy
60150001011 74.89%
60150001012 58.05%
60150001021 27.37%
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 17
Block Group Percentage of
Renter Occupancy
60150001022 22.13%
60150001072 38.99%
Flood risk and hazards are specific considerations which may require site-specific modelling and historical data for planning applications. As such, the flood hazard zone data from FEMA was used to provide a map depicting the special flood hazard area (SFHA) as it intersects with the block groups. However, outputs from hydrologic modelling and historical data would provide more specific information for use in determining flood risk and hazards to vulnerable populations. The SFHA flood zone boundaries by block group along with the demographic index score is provided in Figure 6 (below).
Figure 6 SFHA Flood Zone Boundaries by Block Group
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 18
Climate-related hazards including flood risk and hazard and SLR were reviewed using FEMA data, EJScreen community analysis, and NOAA Fisheries sources. The risk of SLR was determined to be low by the NOAA Fisheries CSVI report for the city as a whole. Because flood risk and hazard may require technical inputs from hydrologic models and historical data when used for planning, the SFHA figure (above) was provided for informational purposes but is limited by the use of publicly available data.
Supplemental indicators were integrated into the analytical approach based on relevance to place and activity and based on standard socioeconomic indicators used for environmental, economic, and climate justice screening and assessment (see Table 2). Supplemental indicators included in the analytical evidence base are representative of the potential for pollution and public safety burdens (UST location - environmental release; traffic proximity and volume– air quality and safety) and social and economic vulnerability in the form of housing burden and economic vulnerability (renter-occupied residences; commercial activity). Table 7 (below) provides a statistical ranking of each block group per supplemental indicator along with block group level population counts by individual and household. Indicator definitions are provided in Table 2.
Table 7
Indicator Block Group Rank*
Supplemental Indicators
Renter-occupancy
060150001011 1
060150001012 2
060150001021 4
060150001022 5
060150001072 3
Commercial activity
060150001011 5
060150001012 4
060150001021 3
060150001022 2
060150001072 1
Traffic proximity and volume
060150001011 5
060150001012 1
060150001021 4
060150001022 2
060150001072 3
UST
060150001011 3
060150001012 1
060150001021 2
060150001022 5
060150001072 4
Population Density/Counts
Population
60150001011 3
60150001012 5
60150001021 4
60150001022 1
60150001072 2
Number of households
60150001011 4
60150001012 5
60150001021 1
60150001022 2
60150001072 3
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 19
* where 5 = Least or fewest and 1 = Most or highest
The demographic index score was combined with the scores for the supplemental indicators and population density to provide a cumulative score for each block group. This score provides an input for understanding the level of potential social vulnerability, as it is described by the indicators selected for this evidence base, and opportunities to positively impact social equity outcomes for communities with equity concerns at the census block group level. Based on these cumulative findings, an Equity Priority score was assigned for use in project prioritization. Table 8 (below) provides the cumulative scores and equity priorities, and Figure 7 (below) provides a visual depiction of the cumulative score and equity priority by block group.
Table 8 Cumulative Scores by Block Group
Block Group Cumulative Score Meaning* Equity Priority
060150001012 12 Higher level of potential
combined vulnerability
1 060150001011 18 2
060150001021 22 3
060150001072 23 4
060150001022 35 Lower level of potential
combined vulnerability
5 * = indicators comprising the cumulative score include those that are used to determine whether a community is considered disadvantaged by state and federal definitions (see Section 3). The score is comprehensive of the demographic index score combined with the supplemental indicator scores.
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 20
Figure 7 Cumulative Scores and Equity Priorities
8. Demographic and Cumulative Score Use Notes
The demographic index calculated during this analysis provides a comparative measure of social vulnerability at the census block group level. The cumulative score is the calculated demographic index combined with the supplemental indicator scores. The demographic index includes core socioeconomic indicators and the cumulative score includes both those core socioeconomic indicators along with the selected supplemental indicators that provide more refined information to reflect pollution burden, public safety, and economic vulnerability.
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way. 12588710 21
Both the demographic index and the cumulative score are designed to provide inputs for the evidence base needed to select opportunities and priorities to advance social equity in infrastructure planning and development.
The equity analysis was performed with currently available existing public data sets and did not include hydrologic modelled or historical data. Analyses were performed at the census block group level, so statistics reflect conditions in those geographies and are not limited to land area included in the City boundary.
Regards
Amber Shows
Project Manager
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 98 Appendix C
Data Collection Field Surveys
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 99 C-1 Purpose
The purpose of the data collection analysis was to provide an inventory of the storm drain infrastructure for the City and use that data to inform the H&H analysis. Data collected during the field survey efforts are described in the sections below.
C-2 Required Data
Data collected included watershed and sub-watershed boundary verification, surface flow routing, and existing drainage infrastructure. Data was collected through a site investigation visit with efforts between GHD and the City of Crescent City staff members and is described below.
C-2-1 Digital Elevation Model (DEM)
The existing Coastal Lidar supplied digital elevation model (DEM) was determined to have high enough resolution for the purposes of this H&H analysis. However, an expanded DEM capturing the topographic details of areas contributing to the storm water drainage system is required. These areas were determined through a preliminary watershed delineation through PCSWMM with the “Watershed Delineation Tool.” The expanded areas of the DEM do not contain drainage infrastructure elements and only contribute surface runoff to the system. Therefore, a lower resolution DEM layer to capture the expanded areas would be acceptable. The outcome of this step is a conformed DEM with the highest resolution in the lower reaches, and the lowest resolution in the higher reaches, shown in Figure 9.5 below.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 100 Figure 9.5 Conformed DEM.
After this step, the watershed delineation tool is run to provide a preliminary delineation of the watershed and sub watersheds. The watershed and sub watersheds delineated inform the creation of the watershed map book.
C-2-2 Watershed Boundaries and Surface Flow Routing
Using DEM and using watershed delineation tool with existing model, the GIS output from PCSWMM is utilized to create the map book. Hydrologists then field verify flow boundaries and directions for each sub watershed. As the first element of field data collection; watershed and surface flow routing are verified through a field investigation by verifying watershed boundaries delineated within the watershed map book.
The model is most sensitive to areas in lower elevation within higher energy segments (greater changes in elevation for flow sections), and accordingly, data collection will be prioritized for these regions. Higher elevations and lower energy segments (flatter surface flow sections) of the watershed are of lower priority but are still recommended to collect to ensure a thorough and accurate model.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 101 The watershed delineation tool delineates watersheds and surface flow route off connections to all existing DI junctions to provide a preliminary watershed boundary. The preliminary watershed boundary will be utilized to create a watershed map book, delineating where each watershed outfall or drainage point is located. Watershed and subwatershed boundaries to be verified and modified based on surface flow routing affected by topography and hard barriers (i.e. roads, buildings, etc..). Areas with permittable flooding such as parks or fields considered ‘greenspaces’ are to also be identified and delineated. Watershed and sub-watershed boundaries and other collected field data is to be recorded in the GIS team provided watershed map book. This field work is to be conducted by the hydrologist on site and can be conducted concurrently with data collection needs described below in Section C-2-3.
Outcome of this objective is a revised watershed boundary map to incorporate into the model as a GIS file. Attributes for the GIS watershed boundary map are consistent with the attributes for the PCSWMM model.
C-2-3 Existing Drainage Infrastructure
Data collection for the existing drainage infrastructure was collected concurrently with watershed boundary and surface flow routing data collection. This section describes the data collected, and the methodology of how the data was collected.
Conditions Assessment
The conditions assessment for junctions and conduits were rated on a scale of 1-3 with 1-“Good”, 2-“Emerging Issue” and 3-“Critical Issue”. Condition was visually determined based on the infrastructures ability to convey storm water.
Infrastructure unable to convey storm water were given a “Critical Issue” rating; some examples include drainage inlets full of sediment and debris or pipes fully crushed. “Emerging Issue” infrastructure were infrastructure able to pass a constricted volume of stormwater; some examples were partially crushed pipes or drainage inlets partially full of sediment/debris. Infrastructure rated “Good” were visually determined to be able to pass stormwater without constriction.
Junctions
Junctions include drainage inlets, manholes, detention basins, and outfalls. For the given pipe and junctions as provided in the City of Crescent Cities GIS, rim elevations were assigned based on the DEM provided elevations, rim and invert elevations need to be verified through GIS field data collection to the cm. A field form was utilized to input junction elevation data that includes junction ID, GPS location, surface area (if applicable), elevation data to the cm and a conditions assessment. This form must be able to accommodate junctions that may be found in the field that were not represented in the City of Crescent Cities GIS data files.
Table 9.2 Field Data to be Collected for H&H Deficiency Analysis – Junctions Data
Item No.
Data Item Data Description Units Data Collection Method Priority (High, Medium, Low)
1J Drainage inlet
(DI) and
manhole (MH)
invert
elevations
- Invert elevations to
bottom of DI’s and
MH’s.
[ft] Utilize Eos Positioning Systems
#19094354 that captures
junction GPS location and
measured elevation to the
nearest cm.
High
2J Sediment
elevation in
drainage inlets
and manholes
- Sediment and other
debris (e.g. driftwood)
build up in DI’s and
MH’s.
[ft] Visual inspection of difference of
pipe invert elevation and
approximate elevation of debris.
To confirm with tape measure.
High
3J Pipe inlet and
outlet offsets
elevation
- The offset is the
conduit invert -
junction invert
[ft] Grab conduit invert elevation and
grab junction invert elevation.
Take difference in office
analysis.
High
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 102 Data
Item No.
Data Item Data Description Units Data Collection Method Priority (High, Medium, Low)
4J Extraneous
drainage
infrastructure
- Any other drainage
infrastructure that
exists in system that is
not represented by the
existing pipe network,
drainage inlets, or
manholes.
- Extraneous drainage
infrastructure could
include, but is not
limited to; drainage
detention basins, trash
capture devices, tide
gates, screens, etc.
n/a 1. Delineate on watershed
map book.
2. Grab GPS location with Eos
Positioning Systems
#19094354.
3. Collect GIS data needs (i.e.
type of infrastructure,
surface area, invert
elevation, rim elevation,
visual inspection of
condition, percent debris
blockage, etc.)
High
5J Outfalls - Outfall rim elevation,
invert elevation, outfall
type, location
verification
[ft] - GIS and GPS (Eos
Positioning Systems
#19094354) field data
collection.
High
6J Drainage inlet
rim elevations
- Drainage inlets are
typically below DEM
scanned surface.
Difference in curb
elevation and
drainage inlet
elevation.
[ft] - GIS and GPS (Eos
Positioning Systems
#19094354) field collection
of rim elevations
Medium
7J Manhole rim
elevations
- Surface elevation of
manhole
[ft] - GIS and GPS (Eos
Positioning Systems
#19094354) field collection
of rim elevations
Low
Conduits
Conduits include closed pipes, ditches, open channel swales, streams, and estuaries. Data needs for drainage system conduits include size, material type, percent full of sediment and debris, and elevation. Conduits identified in the field as critically poor quality should be flagged as ‘critical’ with photo documentation. See the below list for the required input conduit data for the field form:
o Geometry
o Pipe material
o Size
o Percent Full
o Pipe inlet offset elevation
o Pipe outlet offset elevation
The necessary data to be collected was ranked by high, medium, and low priority based on the ability to make model assumptions without the data. It is recommended that all the data requested be collected to ensure model accuracy and validity, however, to accommodate for project schedule and budget, data that could be reasonably assumed without significant impact to the model was ranked as low priority.
Additionally, efforts to collect data should be conducted starting from the known downstream boundaries and work methodically upstream through the watershed. The H&H model is typically less sensitive to differences in drainage infrastructure elevations in more upstream and hilly areas. However, to ensure model validity and that the model captures the existing storm drainage system, it is recommended that all the requested field data is collected at all GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 103 locations within the project area. See Table 2 below for the conduit field data to be collected for the H&H deficiency analysis.
Table 9.3 Field Data to be Collected for H&H Deficiency Analysis – Conduits Data Item
Number
Data Item Data Description Units Data Collection Method Priority (High, Medium, Low)
1C Pipe inlet and outlet
offsets elevation
- The offset is the
conduit invert -
junction invert
[ft] Utilize tool that captures
junction GPS location and
measured elevation to the
nearest cm.
High
2C Extraneous drainage
infrastructure
- Any other drainage
infrastructure that
exists in system that is
not represented by the
existing pipe network,
drainage inlets, or
manholes.
- Extraneous drainage
infrastructure could
include, but is not
limited to; drainage
detention basins, trash
capture devices, tide
gates, screens, etc.
na 1. Delineate on watershed
map book
2. Grab GPS location.
3. Collect GIS data needs.
High
3C Pipe diameter - Diameter of existing
pipes
[ft] - Visual Inspection, Input
on form
- Form to include size
options from 6” to 48”
diameter
High
4C Pipe material - Some materials of
pipes are known
(majority RCP). This
will be marked prior to
field investigations on
GIS map.
na - Visual inspection, input on
form.
- Pipe materials to include:
HDPE, CMP, ACP, PVC,
and Concrete.
Medium
5C Collecting “other”
existing drainage
infrastructure
- Location of all
drainage ditches,
swales, or other
drainage open
channels
na - Field collection of invert
and rim geometry and
roughness (material,
debris blockage
approximation).
Medium
6C Pipe condition
assessment
- Pipe condition
assessment to include
any sediment build up
in the pipe.
[%] - Sediment buildup to be
estimated as a
percentage of pipe.
Low
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 104 C-3 Background Information Review
Background information received from the City was incorporated into H&H model and CIP development. Below in Table 9.4. is a summary of the utilized background data and how it was incorporated into H&H model and CIP development.
Table 9.4 City of Crescent City SDMP Meta Data and incorporation into the project development - summary Name File Description Project Development Incorporation Description
2006-02 Drain Basin 500
Study
List of drainage inlet locations and depths for
the K-Street Outfall (Outfall 2)
Field Data collection data validation
2013-06 Drainage Study Drainage study near C St memorandum, volumes, and location maps.
Field Data collection data validation
2014-06-18 Drainage Survey
for Augustine Meeting
Further assessment of drainage study on C
St.
Field Data collection data validation
Historic ‘as-builts’ of Storm
Drain Infrastructure
Piecewise hand-drawn as-builts of storm
drain infrastructure from 1965 – 2013
Field Data collection data validation
MS4 Permit Most recent MS4 Permit SDMP development
As-builts and plans of Front
St., C St., D St., and F St.
Planned and partially in-construction
drainage improvement projects to take place
on Front St., C St., D St., and F St.
Field Data collection data validation
As-builts of Harding St.
Culvert
As-builts of Harding Ave Culvert Repair
Project
Field Data collection data validation
Storm Drain Capacity
Analysis 3rd St Drainage from
J to K St.
Rational Method analysis assessing the
existing storm drainage capacity on 3rd St.
from J to K St.
Field Data collection data validation;
H&H Model validation
2024.02.23 Front Street Play
to L Plans
Plans for storm drain infrastructure projects
on Front Street.
H&H Model incorporation
City Priority Criteria A ranked list of criteria the City wants considered in project development and
prioritization.
CIP development and prioritization
Critical Facilities A shape file delineating buildings of high importance to the City.
CIP development and prioritization;
Risk Analysis
C-4 Flood History and Observations
Data on historic floods is limited to testimonial data and significant historical events. The City was able to provide a list of known historic flooding locations and dates. Flooding events observed by the City staff that drainage inlets were observed to overflow are described below in Table 9.5.
Table 9.5 List of rainstorm events that drainage inlets and manholes were observed to overflow Date Location
4/25/2006 Super 8 Motel 685 US 101
10/27/2008 3rd St between K St. and L St.
2/11/2009 2nd St. and B St. to 3rd St. and C St.
12/29/2011 3rd St. and J St.
11/29/2012 C St. between 4th St. and 5th St.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 105 Date Location
5/19/2015 3rd St. and M St.
12/9/015 3rd St. and I St.
12/13/2015 5th St. and C St.
1/19/2016 C St.
4/27/2018 4th St. and C St.
12/20/2018 5th St. and C St.
C-5 Field Investigations Results and Data Processing
Through field data collection, data was collected for 67 manholes, 405 drainage inlets, 10 outfalls, and approximately 67,300 linear feet of pipe. Additionally, the watershed and sub watershed (subcatchments) boundaries were defined and confirmed. The field data was processed and organized through Microsoft Excel before being imported directly into the PCSWMM H&H model. After the data was imported into the model, further data processing was required to input the material through the Mannings’ roughness coefficient for the conduits, routing the subcatchments to their concentrated flow outlet, interconnecting the drainage system with topographically identified drainage swales and street flow. See Figure 2.1 for the existing inventory of the City’s storm drainage infrastructure.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 106 Appendix D
Computation Model Development
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 107 Computational Model Development
This section provides the approach and information required to develop the PCSWMM model to simulate and evaluate a series of design storm events. The “base conditions” model is to represent the City as accurately as possible with the existing infrastructure and infrastructure condition.
D-1 Model Approach Overview
The approach of developing the base conditions model is to first incorporate the data collected in field investigations.
The data incorporated into the model from field collection is summarized in in Appendix C of the Crescent City Strom Drain Master Plan. After the existing infrastructure data are incorporated, representative design storms, watershed boundaries and characteristics, and outfall conditions are incorporated into the PCSWMM computational model.
The purpose of the H&H analysis approach is to evaluate the existing and proposed conditions for relevant design storm events, then to assess the changes in the amount of storm water runoff and any resulting surface flooding to inform drainage enhancement project development. This analysis approach includes the following tasks:
1. Integrate Data Collected from Field Surveys. Use inventory of the existing drainage infrastructure collected from field surveys to model drainage network including conduits, junctions, storages, and outfalls.
2. Design Storms. The design storms evaluated in the analysis include the 2-year, 10-year and 50-year return period, 24-hour duration storm events. Forecasted changes to precipitation in the given return frequencies as a result of climate change were also included in the analysis.
3. Outfall Boundary Conditions. Determine flood zone from FEMA Flood Hazard Mapping. For ocean outfalls, apply applicable Sea Level Rise (SLR) assumptions to develop downstream boundary condition.
4. Subcatchment Delineation. Delineate subcatchment areas and determine flow routing. During this task the hydrology parameters used to calculate the stormwater runoff flow rate such as area, flow length, slope, and curve number are developed.
5. 1D Computational Base Condition Model Simulation. Simulate design storm events and evaluate stormwater runoff quantities and flooding under existing conditions. This step is a 1-dimensional link-node analysis that estimates the stormwater routing and runoff from the Project area using a computational model, PCSWMM 2024 (Version 7.7.3895). The model uses the Natural Resources Conservation Service (NRCS) Time of Concentration Method, Watershed Lag Method to calculate the runoff volume and flow rates from each subcatchment to each junction. The model then calculates the flow rate and volume of stormwater routed to the modeled junctions and flooding out of the modeled junctions.
6. 2D Computational Existing Condition Model Simulation. Develop a 2-dimensional base-conditions model to assess the flooding location, extent duration, and volume within the City boundaries.
7. Drainage Deficiency Analysis. Identify and prioritize drainage deficiencies within the City boundaries based on flood locations simulated in Step 6. Prioritization will be aligned with City feedback and objectives.
8. 1D Computational Proposed Condition Model Simulation. After developing a prioritized list of project alternatives to address drainage deficiencies, simulate design storm event to evaluate the level of service provided by the drainage improvement alternatives.
D-2 Design Storms
The design storms used for the analysis is the hypothetical depth of rainfall that would occur for a specified return frequency (once every 2, 10, and 50 years), duration (24-hours) and timing of distribution. All values are based on the historic rainfall records for the area.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 108 D-2-1 Design Storms Type
An SCS Type IA design storm type was selected based on the location of the Project and using the Army Corp of Engineers HEC-HMS Technical Reference Manual. The reference map of the approximate geographic boundaries is shown below in Figure 9.6.
Figure 9.6 Approximate Geographic Boundaries for SCS Storm Distributions. (From HEC-HMS Technical Reference Manual, ACOE).
D-2-2 NOAA-14 Precipitation Frequency Estimates
The values for the precipitation amounts were obtained from National Weather Service NOAA Hydrometeorological Design Studies Center Atlas 14 for point precipitation frequency estimates. The Atlas provides a site-specific intensityduration-frequency curve for precipitation, as shown in Figure 9.7. A table of values for multiple recurrence intervals and duration is presented in Attachment 2. The analysis evaluates the 24-hour storm duration for the 2-year (4.35 inches), 10-year (6.32 inches), and 50-year (8.25 inches) return. A graphical representation of the rainfall intensities is shown in Figure 9.7.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 109 Figure 9.7 Rainfall Intensity Curves for Multiple Return Periods (SCS Type IA).
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 110 Figure 9.8 Intensity Duration Frequency Curve for Precipitation at Project Site.
D-2-3 Cal-Adapt Climate Forecast and Design Considerations The California Department of Water Resources’ Climate Change Technical Advisory Group produced a set of climate change simulation forecasts that project future climate conditions by region. These simulations are general circulation models that incorporate changes in the Earth’s atmosphere, oceans, lands, and ice cover (California Energy Commission, 2024). Over a 30-year historical period from 1961 – 1990, the maximum 1-day precipitation depths were measured and recorded, shown below in the brown shaded region in Figure 9.9 under “Modelled Historical.” The black line within the Modelled Historical shaded region represents the actual measured precipitation maximum intensities in in/hr over a 24-hour period. The brown line within the Modelled Historical shaded region represents the modelled average precipitation intensity over that period. The base line historical precipitation projections were modelled under two scenarios: Medium Emissions and High Emissions. The Medium Emissions (RCP 4.5) is a climate projection that assumes that global greenhouse gas concentrations will continue to increase based on historical projections, peak GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 111 around mid-century (~2050), then decline (Pierce, D. W., J. F. Kalansky, and D. R. Cayan (Scripps Institution of Oceanography), 2018). This projection would result in an increase in localized energy of 4.5 Watts per square meter by the year 2100, aka a representative concentration pathway (RCP) of 4.5. The RCP 4.5 scenario has an accompanying projected temperature increase, change in annual and maximum precipitation frequencies, and other climate related consequences. Alternatively, the High Emissions (RCP 8.5) scenario is a climate emissions model that assumes a continuous increase of global greenhouse gas concentrations based on historical rates (Pierce, D. W., J.
F. Kalansky, and D. R. Cayan (Scripps Institution of Oceanography), 2018). The projected 30-year average change and respective ranges of change for each simulation are summarized below in Table 9.6. Based on these modelled expected changes to rainfall intensities, the NOAA-14 projected rainfall intensities are subject to change, these changes are summarized below in Table 9.7.
Figure 9.9 Maximum 1-day Precipitation for three 30-year time periods (Livneh, 2015).
Table 9.6 Maximum 1-day Precipitation for three 30-year time periods (Livneh, 2015) Simulation Time Period
(years)
Change from
baseline (in)
30-year average (in) 30-year range (in)
Baseline (Modelled
Historical)
1961 – 1990 0 2.771 2.516 – 2.990
Mid-Century
(Medium Emissions
(RCP 4.5)
2035 – 2064 +0.194 2.964 2.533 – 3.275
Mid Century (High
Emissions RCP 8.5)
2035 – 2064 +0.219 2.990 2.588 – 3.370
End Century
(Medium Emissions
RCP 4.5)
2070 – 2099 +0.175 2.946 2.558 – 3.487
End Century (High
Emissions RCP 8.5)
2070 – 2099 +0.374 3.145 2.663 – 3.691
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 112 Table 9.7 RCP 4.5 and RCP 8.5 projected changes in 30-year periods to the NOAA-14 Rainfall Intensity for the 2-yr 24-hour, 10-yr 24-hour, and 50-yr 24-hour rainfall events
Return
Period
NOAA-Atlas 14
Intensity
Projections
Historic
(October 1960
- Sept 1990)
Mid Century (October 2034 -
Sept 2065)
End Century (October 2069 -
Sept 2099)
(years) (in) (+0 in) RCP 4.5
(+0.194 in)
RCP 8.5
(+0.291 in)
RCP 4.5
(+0.175 in)
RCP 8.5 (+
0.374 in)
2-year, 24-
hour storm 4.35 4.35 4.54 4.64 4.53 4.72
10-year, 24-
hour storm 6.32 6.32 6.51 6.61 6.50 6.69
50-year, 24-
hour storm 8.25 8.25 8.44 8.54 8.43 8.62
Due to the variability in projected maximum 1-day precipitation events, it is recommended that for the preliminary assessment of drainage performance, the 50-year 24-hour NOAA-14 simulation be utilized for design purposes.
Utilizing the 50-year 24-hour rainfall event provides a conservative and flexible assessment of expected rainfall intensity patterns and allows the City a longer period to secure funding and develop proposed projects.
D-3 Downstream Boundary Conditions
The downstream boundary conditions were determined based on location, elevation, and receiving water body characteristics. For the City, eight (8) tidal and one (1) normal outfall were determined. See Sections D-3-1 and D-3-2 for details of these analyses. Outfall 1 (OF1) is the normal conditions outfall and Outfalls 2 – 9 (OF2 – OF9) are tidal outfalls. See Figure 9.10 below for the outfall locations with respective drainage groups contributing to the outfall.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 113 Figure 9.10 Outfall locations with respective drainage groups.
D-3-1 Tidal Outfall Boundary Conditions
Tidal conditions were inputted into the model with guidance from Chapter 820 – Cross Drainage of the Federal Highway Design Manual (Highway Design Manual, 2020). The City of Crescent City falls within Province 1 of the California Open Coast and Bayfront Water Level, shown below in Figure 9.11. The controlling Gage Station is Buoy 9419750, located off the coast of Crescent City. When developing the tidal outfall boundary conditions for each respective 24-hour design storm simulation (2-year, 10-year, and 50-year), the respective tailwater elevation (ft) is a function of a one-percent compound frequency curve, made for each respective Province. The Province 1 OnePercent Compound Frequency Curve was developed by the Federal Highway Design Manual in accordance with Buoy #9419750 data obtained from NOAA and is shown below in Figure 9.12.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 114 Figure 9.11 California Open Coast Province Map (Highway Design Manual, 2020).
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 115 Figure 9.12 One Percent Compound Frequency Curve for Province 1 (Highway Design Manual, 2020).
Utilizing the MHH tailwater elevation in feet from the One-Percent Compound Frequency curve, historic tidal data was obtained through the NOAA tidal data base. The tidal data was analyzed to find corresponding tidal events with the respective MHH water tidal levels for the 2-yr, 10-yr, and 50-yr events based on the one-percent compound frequency curve for Province 1. The MHHW level for the 2-yr event was identified to be 8.75-ft, for the 10-yr event was 8.1-ft, and
6.6-ft for the 50-year event. The tidal events were selected for a 24-hour event and aligned with the rainfall hydrographs for the 2-yr, 10-yr, and 50-yr rainfall events. The peak of the rainfall event was aligned with the peak tidal elevation. See Figure 9.13, Figure 9.14, and Figure 9.15 below for the aligned 2-yr, 10-yr, and 50-yr 24-hour design storm and tidal events, respectively. See Section D-2-2 for further details of the development of the design storm rainfall hydrographs.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 116 Figure 9.13 2-yr SCS Type 1a 24-hour design storm hydrograph with peak rainfall aligned with peak MHH for 2-yr compound frequency tidal event.
Figure 9.14 10-yr SCS Type 1a 24-hour design storm hydrograph with peak rainfall aligned with peak MHH for 10-yr compound frequency tidal event.
0 0.2
0.4 0.6
0.8 1
1.2 -1
0 1
2 3
4 5
6 7
8 9
10 Design Storm Depth (in)
MHH (ft)
H:M:S
2-yr SCS Type Ia & MHH
MHH Hydrograph
-0.2
0.3 0.8
1.3 1.8
-2
0 2
4 6
8 10
Design Storm Depth (in)
MHH (ft)
H:M:S
10-yr SCS Type 1a & MHH
MHH Hydrograph
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 117 Figure 9.15 50-yr SCS Type 1a 24-hour design storm hydrograph with peak rainfall aligned with peak MHH for 50-yr compound frequency tidal event.
D-3-2 Normal Outfall Boundary Conditions
The Project site is located within the Elk Creek FEMA floodplain Zones A and X. Of the ten (10) drainage outfalls, Outfall 1 is the only non-tidally influenced outfall, located within FEMA floodplain Zone A. Figure 9.16 below provides the National Flood Hazard Layer FIRMette illustrating the location of Outfall 1 with respect to the site floodplains.
Detailed hydraulic analyses are not performed for Zone A floodplains, therefore no base flood elevations exist (Federal Emergency Management Agency, 2024). Additionally, Zone X floodplains are characterized as areas of minimal flood hazard. Outfall 1 is located at an elevation of approximately 14-ft (NAVD88), and the highest water level of Elk Creek in the surrounding drainage site was determined to be approximately 10ft (NAVD88) at maximum capacity. Because the outfall is significantly higher than the maximum elevation of the receiving waterbody, it is assumed that the outfall will not receive backflow and is under normal conditions. -0.1
0.4 0.9
1.4 1.9
-2
-1
0 1
2 3
4 5
6 7
8 Design Storm Depth (in)
MHH (ft)
H:M:S
50-yr SCS Type 1a & MHH
MHH Hydrograph
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 118 Figure 9.16 FEMA National Flood Hazard Layer FIRMette illustrating location of Outfall 1 (Federal Emergency Management Agency, 2024).
D-4 Watershed Delineation and Characterization
D-4-1 Subcatchment Delineation
The subcatchments were initially defined using the watershed delineation tool based on a high-resolution digital elevation model, and subcatchments were then refined using survey data on other infrastructure in PCSWMM modeling software. Site topography was used to refine subcatchments and routing points within the drainage network and hard structures such as roads, buildings, and parking lots. Subcatchments were sized depending on how water was routed, in cases that the surface flow runoff routed to the same point within the drainage network, a larger subcatchment was delineated. There is a total of 403 subcatchments within the larger watershed, illustrated below in Figure 9.17.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 119 Figure 9.17 Watershed delineated subcatchments. Dark green represent subcatchment boundaries, red perforated lines illustrate point of concentrated flow.
D-4-2 Subcatchment Parameters
To characterize the hydrologic properties of each subcatchment, hydrologic parameters were calculated and assigned to their corresponding subcatchment including percent impervious area vs. pervious area, SCS curve numbers, average slope, and flow lengths. Calculations were performed in excel and imported to PCSWMM through the import function that assigns each parameter to its respective subcatchment. (Attachment 3).
Flow Length and Slope
Flow length and slope for the subcatchments were determined through developing a flow path layer in the PCSWMM model, which represents the average maximum length of overland sheet flow and shallow concentrated flow. These flow lengths are then used to calculate subcatchment width by dividing the subcatchment area by its subsequent flow length. Flow paths were then manually determined within the model using site topography for each subcatchment as its determining characteristic.
Subcatchment Curve Number and Pervious Area
The SCS Curve Number for each subcatchment was calculated in excel as a function of area percentage of hydrologic soil group (A, B, C, and D) and land use description. The area percentage of subcatchment land use with respect to proportion of pervious to impervious area was determined by using aerial imagery to assess soil composition, soil quality, and land use (i.e. locations of buildings, roads, fields, forests, etc.). Data from the USDA Web Soil Survey was used to determine the site soil composition, then percent land use was applied based off aerial imagery via PCSWMM GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 120 and Google Earth Pro. These parameters were then used to calculate Curve Numbers to be assigned to each subcatchment. (Attachment 4).
Subcatchment Time of Concentration
Time of Concentration is critical to calculate the runoff flow for each subcatchment into the drainage network with respect to the design storm. The average slope for the subcatchments was determined by calculating the average slope in each subcatchment based on defined area and topography. The process was done by using the “Set DEM Slope” tool in PCSWMM for each subcatchment, Slopes, flow paths, and curve numbers are then utilized by the PCSWMM SCS Type II processor to calculate the time of concentration. The areas for each subcatchment were automatically calculated based on its geometry and populated into the subcatchment attribute table in the model. The time of concentration was determined using the SCS Method Type II (Equation 1 & 2), a function of flow length/width, slope, and curve number.
𝑡𝑡𝑐𝑐 = 𝐿𝐿0.8(𝑆𝑆 + 1)0.7
1140𝑌𝑌0.5
(Equation 1)
Where:
𝑡𝑡𝑐𝑐 = 𝑡𝑡𝑡𝑡𝑡𝑡𝑡𝑡 𝑜𝑜𝑜𝑜 𝑐𝑐 𝑐𝑐𝑐𝑐 𝑐𝑐 𝑐𝑐𝑐𝑐 𝑐𝑐 (ℎ 𝑟𝑟)
𝐿𝐿 = 𝑓𝑓 𝑓𝑓 𝑙𝑙 ℎ ( )
𝑆𝑆 = 𝑚𝑚 𝑚𝑚 𝑝𝑝 ( 𝐸𝐸𝐸𝐸 2)
𝑌𝑌 = 𝑎𝑎 ℎ 𝑒𝑒
𝑆𝑆 = 1000
𝐶𝐶𝐶𝐶 − 10 (Equation 2)
D-5 Surface Flow Routing Methodology
The flow routing through the system incorporated the existing, planned and in-construction drainage system infrastructure and open channel flow with the larger water flow network through the system to the identified outfall locations (OF 1 – OF 10). The utilized flow routing methods are detailed below as existing drainage infrastructure flow routes, street flow, and concentrated surface flow, respectively. The planned and in construction drainage elements system flow routing were included per the information provided by City staff.
D-5-1 Existing Drainage Infrastructure Flow Routes
The first step to delineate the existing drainage infrastructure flow routes was to load in the data of all identified existing conduits (pipe networks and open channels), junctions (grate inlets, pipe connections, stormwater vaults, etc.), and stormwater depression basins. Existing system infrastructure with appropriate defining parameters were uploaded into the H&H model with field data collected. See Appendix C above for more details on field data collection assumptions and methodology. Existing condition conduit diameter, percent blockage, material type, invert and rim elevations were loaded into the model. Existing condition junction type, invert elevation, rim elevation, were also loaded into the model.
For junctions and/or conduits that were inaccessible for field collection, their specs were assumed based on the GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 121 upstream and downstream conditions. See Attachment 5 for the existing “base” conditions model data for junctions, conduits, and outfalls. See Figure 9.18 below for the plan view of the project’s existing drainage infrastructure network.
Drainage runoff basins and open channel flow were identified within the City drainage system boundaries. Drainage runoff basin surface areas and depth, and open channel lengths and cross-sectional areas were assigned based on the site Digital Elevation Model (DEM) and utilizing the Storage Creator tool in PCSWMM to delineate the dimensions of each drainage basin. These drainage basins were assigned respective storage curves based on these delineated dimensions. Drainage infrastructure and contributing surface runoff were categorized by their connected outfall.
Drainage infrastructure contributing to a common outfall can impact infrastructure upstream and/or downstream and therefore should be considered together for project development. For example, if an upstream pipe was upsized with no consideration for the downstream impacts, there is potential the additional flow passing through the upsized upstream conduit could lead to unexpected flooding within the downstream network.
Figure 9.18 Existing Drainage Infrastructure Flow Route Plan View.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 122 D-5-2 Dual Drainage Flow Routing
Dual drainage flow routing was considered with this drainage system analysis. Dual drainage flow routing considers a major and minor drainage system. Major drainage systems are defined as drainage systems designed to capture water conveyance on the surface, for example drainage swales or ditches, road gutter flow, or storage detention ponds. Minor drainage systems are characterized as underground drainage conveyance, typically through circular pipe connections. Open channel and street flow connections shown above in Figure 9.18 are considered major drainage system components as the blue underground pipes are minor drainage system components. See Figure 9.19 below for a further description of dual drainage system components.
Figure 9.19 Dual drainage system components (CHI PWSWMM, 2024).
D-5-3 Model Parameters
Junctions
Junctions within the drainage system include manholes, drainage inlets, and blind junctions. This section describes the existing junctions within the project area and how they contribute to the dual drainage flow routing.
Manholes
Manholes are defined as locations where conduits join that are accessible for maintenance through a manhole.
Throughout the project site, a total of 66 manholes were identified, with a wide range of depth and general condition of the manhole. See Figure 9.20 below for an example of a manhole near Front St. Manholes were identified throughout the City boundary on roads, sidewalks, and sometimes in grassy areas, like in Figure 9.20. It is assumed that all flow routing to manholes in the drainage system occurs through connected closed-pipe conduits. In drainage flow routing, no surface land flow was linked directly to manholes. Manholes serve as maintenance access points of the minor drainage system.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 123 Figure 9.20 Manhole investigated during data collection near Front St.
Drainage Inlets
For the purposes of this analysis, drainage inlets were defined as any junction designed to receive surface flow runoff.
Drainage inlets identified in the drainage system include curb inlets, grate inlets, and drop inlets. Throughout the project site, a total of 404 drainage inlets were identified. These drainage inlets had a wide range of depth, condition, apparent age, and percent blockage. See Figure 9.21, Figure 9.22, and Figure 9.23 below for a few of the found drainage inlets of varying types and conditions. Subcatchment concentrated surface flow runoff was linked directly to drainage inlets, shown by the red perforated lines in Figure 9.18. Drainage inlets serve to connect the major drainage system with the minor drainage system.
Figure 9.21 Curb inlet found in field data collection.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 124 Figure 9.22 Grate inlet found in field data collection.
Figure 9.23 Grate inlet found in field data collection.
The Federal Highway Administration recommendation for inlet design considers the following four (4) typical inlet types: grate inlets, curb-opening inlets, combination inlets, and slotted inlets. See Figure 9.24 below for a summary of the storm drain inlet types. Through field investigations, these four inlets were found throughout the City’s boundaries, with the highest proportion being grate inlets and combination inlets. The Hydraulic Engineering Circular No. 22 (HEC22) provides an interception capacity of inlets on grates that estimates the amount of flow efficiency a grate can intake under a given set of conditions. For the purposes of this analysis, the drainage inlets assigned to the junctions were given an assumed value representative of Grate A shown in Figure 9.24. However, in further project development, it is recommended that a more detailed drainage inlet capacity analysis be conducted with recommendations from the Federal Highway Design Manual.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 125 Figure 9.24 Storm drain inlet types summary (Federal Highway Administration, 2024).
Blind Junctions
Blind junctions include conduit connections without an accompanying drainage inlet or manhole. These junctions were not linked to the surface flow runoff of the system and are majorly underground pipe connections. Blind junctions had rim elevations assumed by upstream pipe outlet offset elevation and invert elevations assumed by downstream pipe offset elevation. Blind junctions represent a large proportion of the minor drainage network but have no direct connection to the major drainage network.
Closed and Open Channel Conduit Analysis
The closed and open channel conduits in the system represent all flow networks that interconnect the junctions.
Underground pipe networks are within the minor drainage system as surface exposed open channel flow and street flow are part of the major drainage system. See Section D-5-2 for more details on the major and minor drainage systems.
Pipes
There are approximately 67,000 linear feet of underground storm drainpipes that convey the City’s drainage. This linear footage of drainage pipe was summarized based on diameter, shown below in Table 9.8. See Section 5 for further details of existing pipe networks by diameter, length and material by Drainage Group.
Table 9.8 Linear feet of drainage pipe in Crescent City drainage system by diameter Diameter (ft) Linear feet of pipe (ft)
0.5 145
0.67 936
0.75 327
0.8 199
1 24,331
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 126 Diameter (ft) Linear feet of pipe (ft)
1.2 45
1.25 4,084
1.3 109
1.4 95
1.4 14,304
1.6 29
2 11,822
2.25 195
2.5 2,915
2.67 193
2.75 226
3 6,117
4 1,181
Open Channel Flow
Open channel flow within the drainage network consisted of vegetated swales, creek flow, canals, and other miscellaneous channels that convey stormwater between nodes in the system. The open channel flow networks are part of the major drainage system, illustrating how concentrated runoff contributes and enters the minor drainage network. There is approximately 87,000 linear feet of open channel flow conveying stormwater through the drainage system. A major contributor to open channel flow in the drainage network is the channel “Elk Creek Channel” that runs parallel to Cemetery Rd. and drains to the Elk Creek marshland to the southeast. Access to survey the Elk Creek Channel was limited due to a lack of safe access points. The high-resolution DEM was utilized to estimate the geography of the contributing creek. See Section Appendix C, Section 2-1 for more details of the DEM formulation and resolution. It is recommended that for further analysis, a more detailed survey be conducted to assess the storage capacity of the Elk Creek Channel.
Street Flow
Street flow was utilized in this analysis to model a proportion of the major drainage system that is solely supported by surface road flow. It is important to note that not all projected street flow is included in this analysis, only in the cases that street flow was the only drainage route to interconnect junctions to outfalls, for instance, a bubbler. Bubbler drainage systems are designed as typically two (2) drainage inlets connected by a pipe and not connected to any outfall source. The only surface flow route for the water to flow if a drainage inlet is to overflow in a bubbler is the over the adjacent land, which in this drainage system were roadways and gutters. Street flow was modeled into the system under the Street Editor tool in PCSWMM. The Street Editor tool takes input from the user to define the roadway considering the full or half street flow, the street width, the cross slope, the curb height and the Manning’s roughness value of the roadway. Each street flow in the H&H model was defined based on-site investigation, topography, and standard values for roadways defined in the Urban Drainage Design HEC-22 reference manual (Federal Highway Administration, 2024).
Storages
Storages were included in the base-conditions model to model natural or intentional drainage basins that would hold a significant amount of stormwater in a storm event. Storage basin volume was approximated using the site topography GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 127 DEM layer. Storage volumes are estimated using the embedded “Storage Creator” tool in PC, that approximates the depth to surface area ratio based on the applied DEM layer. The Storage Creator then assigns a “Storage Curve” for each storage unit. The “Storage Curve” is a graphical and tabular relationship between depth to surface area of the storage. See Attachment 6 below for the storages and respective curves within the base conditions model.
D-6 Two-Dimensional Hydrologic and Hydraulic Analysis
The one-dimensional base conditions H&H analysis was able to determine the volume, duration and point location of flooding within the drainage network, however, the surface flow impacts of the point flooding cannot be determined without a two-dimensional H&H analysis. The two-dimensional H&H analysis was able to locate the extent, duration and depth of flooding throughout the project boundary. Three versions of the base-conditions two-dimensional model were generated, the 2-year, 24-hour storm and tidal conditions, 10-year, 24-hour storm and tidal conditions, and the 50-year, 24-hour storm and tidal conditions. This section details the steps of the two-dimensional H&H approach.
D-6-1 Bounding
The creation of the bounding layer is the first step in generating the 2-dimensional model. The bounding layer defines the extent of the two-dimensional model, where the mesh layer will be generated. The bounding layer is illustrated below in Figure 9.25. The bounding layer is a hexagonal style with a 30-ft resolution, which allows the mesh network to have hexagonal formation with triangular connections with a maximum water depth measured of 30-feet. See Section D-6-2 for further details of the mesh formation.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 128 Figure 9.25 Plan view of drainage network with bounding layer boundaries.
D-6-2 2D Mesh Layer
Within the bounding layer, a two-dimensional mesh layer was generated to connect the systems drainage inlets, manholes, and storages to the mesh. PCSWMM utilizes the mesh layer to conduct a Triangular Gaussian quadrature to simulate the water flow through the drainage network with respect to the site’s topography through the DEM layer.
See Figure 9.26 for an example of how the mesh layer connects to the existing drainage network through a drainage inlet. The connecting storm drain infrastructure node is then connected to both the existing drainage network and the mesh layer – water simulation. This connection allows the model to better approximate the flow inflow from the upstream connected pipe(s) and the topographically defined surface flow routed into the system.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 129 Figure 9.26 Mesh layer connection with sample drainage inlet.
D-6-3 Downstream Boundary Condition
The downstream boundary conditions are defined by areas in the models where water is anticipated to leave the system outside of the pre-defined outfalls, described previously in Section D-3. Modelling the downstream boundary condition is useful in estimating how the water exits the system across the existing terrain. When water exits the modelled system, there is a potential for backwater effects to not be properly captured within the model. Including the downstream boundary condition better represents potential backwater into the system and how backwater might influence upstream flow.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 130 Appendix E
Preliminary Assessment of Anticipated
Environmental Review and Permitting
Requirements
Appendix E - Preliminary Assessment of Anticipated Environmental Review and Permitting Requirements Drainage
Group CIP ID Description / Proposed Improvements Within Caltrans ROW? Receiving Water (existing outfall) Within Coastal Zone? (per City LCP) Intersects Natural / Undisturbed Area? Mapped Floodplain Status (FIRM 060039C eff. 08/02/2017) Coastal Jurisdiction Existing Environment/Setting Environmental Permits / Approvals Permitting Narrative Class V Environmental Permitting Cost Tier Key Assumptions / Notes 1 DG1.1 Upsize ~80 LF to 3-ft HDPE; upsize ~700 LF to
2-ft HDPE on Hwy 101; install 4 new DIs. Entirely within Caltrans ROW.
Yes - entirely Caltrans ROW
Elk Creek tributary (existing outfall, no work proposed at outfall) Within County of Del Norte LCP, but at very edge. Possible that some work would occur within City General Plan jurisdiction.
Entirely within paved area of Hwy 101.
Very close to Zone A but may stay out it appears
County-issued CDP (LCP). In coastal zone segment
Caltrans-managed Hwy 101 ROW; proximity to Elk Creek tributary; riparian vegetation close but assume it can be avoided.
County CDP under LCP for portion in coastal zone; Caltrans, County or City lead CEQA Agency, likely a Categorical Exemption.
Caltrans is construction lead; County CDP, CEQA Categorical Exemption. Outfall protected in place. $10,000 Tier 1
2 DG2.1B Upsize ~1,500 LF (9th-5th St) to 2.5-ft HDPE;
upsize ~200 LF (5th & D) to 2-ft HDPE; ~150 LF
lateral; 11 new DIs, 4 new MHs. Outfall at B St Pier.
No Crescent Harbor at B Street Pier
(existing outfall, no work proposed at outfall)
Partially - downstream portion between Front St and harbor is in coastal zone; upstream portion (9th St area) likely outside No No Outside coastal zone (no CDP) Developed urban ROW Minimal due to urban ROW Outside coastal zone; existing outfall protected in place. Minimum environmental permitting expected. $5,000 Tier 1 Project entirely within urban ROW, with
minimal environmental impact.
2 DG2.2 Upsize ~200 LF to 1.5-ft HDPE; upsize ~600 LF
to 3-ft HDPE; ~200 LF lateral; 9 new DIs, 3 new MHs.
No Crescent Harbor (via Group 2
system)
Yes, partially No No Western edge of CIP falls within likely city issued LCP
Developed urban ROW CEQA documentation (likely categorical exemption); City CDP only if portion within coastal zone ROW pipe upsizing in developed area; if outside coastal zone, environmental scope limited to CEQA documentation; minimal environmental permitting effort. $25,000 Tier 1-2 If any portion is within coastal zone, escalates to Tier 2 (~$25K).
2 DG2.2B Upsize ~750 LF to 2-ft HDPE along B St (6th2nd); ~100 LF lateral; 6 new DIs, 3 new MHs.
Routes under private property.
No Crescent Harbor (via Group 2
system)
No No No No, outside coastal zone Developed urban ROW CEQA documentation (CatEx) Routes under private property; minimal environmental scope; CEQA cat. exemption likely
$5,000 Tier 1 Easement acquisition is out of
environmental scope.
3 DG3.1A Upsize ~350 LF to 2.5-ft HDPE; upsize ~2,350
LF to 2-ft HDPE; ~25 LF lateral; 8 new DIs. Tidally influenced area east of Hwy 101.
No (adjacent) Elk Creek (existing outfall, no
work proposed at outfall)
No - east of Highway 101, outside the LCP-defined coastal zone Yes, semi-natural/undisturbed area within and adjacent to freshwater marsh area east of Crescent City Yes, Zone A Outside coastal zone (no CDP needed) Crosses portion of freshwater marsh east of town.
CEQA documentation; possible RWQCB 401/CDFW 1602 if alignment crosses jurisdictional drainage; FEMA Floodplain
Development Permit
Intersects freshwater marsh area; outside coastal zone; verify wetland/jurisdictional waters along alignment; FEMA floodplain permit likely; no CDP required. $60,000 Tier 3 Wetlands + Elk Creek proximity drives
floodplain permit and possible 1602/401. Verify wetland delineation needs - jurisdictional waters likely present.
3 DG3.1B Upsize ~1,600 LF to 2-ft HDPE; ~150 LF lateral; 11 new DIs.
No Elk Creek (via Group 3 system) No - east of Highway 101, outside coastal zone
Yes, crosses freshwater forested/shrub wetland
No Outside coastal zone (no CDP needed) Mostly developed urban ROW, eastern portion crosses a wetland and natural area
CEQA documentation; possible RWQCB 401/CDFW 1602 if alignment crosses jurisdictional drainage; FEMA Floodplain
Development Permit
ROW pipe upsizing in developed area outside coastal zone; eastern portion intersects with wetlands and potential stream channel (other waters). $45,000 Tier 2-3 Wetlands proximity drives 1602/404/401 permits. Verify wetland delineation needs -
jurisdictional waters likely present.
3 DG3.2A Upsize ~550 LF to 2.5-ft HDPE; upsize ~350 LF
to 2-ft HDPE; ~200 LF lateral; 11 new DIs, 2 new MHs.
No Elk Creek (via Group 3 system) No - east of Highway 101 No No Outside coastal zone (no CDP needed) Developed urban ROW CEQA documentation (likely categorical exemption)
Standard ROW pipe upsizing outside coastal zone; minimal environmental scope; CEQA cat. exemption likely. $3,000 Tier 1 Pure ROW work outside coastal zone.
3 DG3.2B Add ~950 LF 3-ft HDPE; add ~300 LF 2.5-ft
HDPE; add ~450 LF 1-ft HDPE; upsize ~650 LF to 3-ft; upsize ~400 LF to 2.5-ft; ~400 LF lateral; 21 new DIs, 6 new MHs.
No Elk Creek (via Group 3 system) No - east of Highway 101 Potentially the far western portion, but seems unlikely
No Outside coastal zone (no CDP needed) Developed urban ROW and riparian; outside LCP coastal zone
CEQA documentation; possible CDFW 1602 / CWA 404/401, CEQA Initial Study / Negative Declaration. if any tie-in to creek/drainage; difficult to tell Largest CIP in Group 3; flow redirection in developed ROW outside coastal zone; CEQA cat. exemption likely unless tie-in to jurisdictional drainage feature.
$50,000 Tier 3 Assume doesn't impact creek at west end.
Scale doesn't drive environmental cost as much as resource impact does. If any tie-in to jurisdictional drainage, escalates to Tier 2-3. 3 DG3.2C Upsize ~800 LF to 2-ft HDPE on E. Washington
Blvd (Amador-Breen); ~50 LF lateral; 2 new DIs. Directs flow to greenway/creek.
No Greenway/creek (per project
description)
Yes, very small portion overlaps along western edge of CIP on Washington Blvd Yes, southern portion at end of Amador Street intersects with undisturbed/natural area No City-issued CDP (LCP) likely. In coastal
zone segment
Discharge to greenway/creek (described in project); jurisdictional drainage potential; possible riparian vegetation RWQCB 401 WQC; CDFW 1602 LSAA; possibly USACE 404 NWP; CEQA documentation (potential IS/MND given resource impact) Discharge to greenway/creek triggers watersof-State permits; CDFW 1602 likely for outfall connection;coastal zone CDP; biological survey needed.
$80,000 Tier 3-4 Highest-resource-risk CIP among Group 3 due to direct greenway/creek discharge. Verify whether greenway is jurisdictional waters of US. CDFW 1602 essentially certain. 3 DG3.3A Upsize ~350 LF to 1.5-ft HDPE; upsize ~50 LF
to 1-ft HDPE; 3 new DIs.
No (adjacent to Hwy 101 and Elk Valley Rd)
Elk Creek (via Group 3 system) Yes, a portion Yes, northern extent Yes, northern extent Small portion in City issued LCP Developed ROW at south end of city near Hwy 101 and Elk Valley Rd; northern portion extends into potential jurisdictional freshwater forested/scrub wetland CEQA documentation; potential RWQCB 401 WQC; CDFW 1602 LSAA; possibly USACE 404 NWP Pipe upsizing addressing south-end flooding; routine environmental scope; CEQA cat. exemption likely; no CDP if outside coastal zone. $60,000 Tier 3-4 Potential FEMA, LCP, RWQCB, USACE.
Depends upon extent of construction at northern extent of CIP. 3 DG3.3B Upsize ~1,300 LF to 2.5-ft HDPE; 7 new DIs.
Intersects Caltrans ROW.
Yes - intersects Caltrans ROW
Elk Creek (via Group 3 system) Yes No Yes City-issued CDP Caltrans ROW at Hwy 101 N/S split area
City CDP under LCP ; CEQA documentation (Caltrans typically lead) Hwy 101 N/S split work; environmental scope contingent on coastal zone status; Caltrans may be CEQA lead; City CDP for coastal zone segment; FEMA floodplain. $50,000 Tier 2-3 Caltrans typically lead for NEPA/CEQA on its ROW.
4 DG4.1A Upsize ~900 LF to 3-ft HDPE; upsize ~400 LF to
2.5-ft HDPE; upsize ~350 LF to 1.5-ft HDPE; ~250 LF lateral; 11 new DIs, 10 new MHs. Resolves flooding at 5th & J and 4th & J.
No Elk Creek (via Group 4 outfall) No No - fully developed downtown grid
No Outside coastal zone Fully developed downtown street grid; no natural features anticipated
CEQA documentation (likely categorical exemption)
ROW pipe upsizing in fully developed
downtown grid; minimal environmental scope; bundle with DG4.1B for permitting efficiency. $5,000 Tier 1 Bundle permitting with DG4.1B. Fully
developed grid - lowest resource risk.
4 DG4.1B Upsize ~1,200 LF to 2.5-ft HDPE; upsize ~300
LF to 2-ft HDPE; upsize ~100 LF to 1.5-ft HDPE; ~250 LF lateral; 11 new DIs, 5 new MHs. Hydraulically dependent on DG4.1A.
No Elk Creek (via Group 4 outfall) No No - fully developed grid No Outside coastal zone Fully developed downtown street grid; no natural features anticipated
CEQA documentation (bundled with DG4.1A)
ROW pipe upsizing in downtown grid upstream of DG4.1A; bundle with DG4.1A under single environmental submittal; minimal scope.
$2,000 Tier 1 Bundle with DG4.1A.
4 DG4.2 Upsize ~600 LF to 4-ft HDPE; upsize ~350 LF to
2-ft HDPE; ~150 LF lateral; 3 new DIs, 4 new MHs. Hydraulically dependent on DG10.1.
No Elk Creek (via Outfall 10 / DG10.1
system)
Yes, small portion at southern end overlaps coastal zone Urban ROW expected No City-issued CDP for southern portion Developed urban ROW; hydraulically tied to DG10.1
CEQA documentation (likely categorical exemption); City CDP if portion within coastal zone ROW pipe upsizing dependent on DG10.1; minimal environmental scope; verify coastal zone status. $10,000 Tier 1 High tier 1 due to coastal zone.
1 Appendix E - Preliminary Assessment of Anticipated Environmental Review and Permitting Requirements Drainage
Group CIP ID Description / Proposed Improvements Within Caltrans ROW? Receiving Water (existing outfall) Within Coastal Zone? (per City LCP) Intersects Natural / Undisturbed Area? Mapped Floodplain Status (FIRM 060039C eff. 08/02/2017) Coastal Jurisdiction Existing Environment/Setting Environmental Permits / Approvals Permitting Narrative Class V Environmental Permitting Cost Tier Key Assumptions / Notes 4 DG4.3 Upsize ~100 LF to 3-ft HDPE; upsize ~700 LF to
2-ft HDPE; upsize ~600 LF to 1-ft HDPE; ~350 LF lateral; 9 new DIs, 4 new MHs. Hydraulically dependent on DG10.1.
No Elk Creek (via Outfall 10 / DG10.1
system)
No No No Outside coastal zone Developed urban ROW; hydraulically tied to DG10.1 system
CEQA documentation minimal ROW pipe upsizing dependent on DG10.1; minimal environmental scope; bundle with DG4.2.
$3,000 Tier 1 Bundle with DG4.2 if alignment permits.
5 DG5.1 Cross-town interceptor: add ~2,200 LF 4.5-ft
HDPE down 9th St (D St to Outfall 5); add ~600 LF 4-ft HDPE; add/upsize ~1,300 LF to 3-ft; upsize ~200 LF to 2.5-ft; ~100 LF lateral; 8 new DIs, 5 new MHs. Outfall 5 to Pacific Ocean south of Preston Island.
No Pacific Ocean at Outfall 5, south
of Preston Island (existing outfall, no work proposed at outfall) Yes - City LCP Assumed all work is within paved
(road) area.
No City-issued CDP (LCP). 9th Street alignment terminates at Pacific Ocean Outfall 5; downstream portion within coastal zone strip; possible coastal bluff/ESHA at existing outfall vicinity City CDP under LCP; CEQA Categorical Exemption
Largest CIP in master plan; appealable City CDP for downstream coastal portion; close proximity of natural habitat (ESHA) may require bio surveys and consideration in permitting. $100,000 Tier 3
5 DG5.2 Upsize ~900 LF to 3-ft HDPE; upsize ~1,000 LF
to 2.5-ft HDPE; upsize ~600 LF to 2-ft HDPE; ~550 LF lateral; 14 new DIs, 3 new MHs. Pacific Ave; dependent on DG5.1.
No Pacific Ocean at Outfall 5 (via
DG5.1)
No No No Outside coastal zone Developed urban ROW on Pacific Avenue; hydraulically tied to DG5.1
Bundle under DG5.1 CDP and CEQA; minimal incremental environmental scope ROW pipe upsizing on Pacific Ave dependent on DG5.1; bundle CDP and CEQA with DG5.1; marginal incremental scope. $5,000 Tier 1 Bundle permitting with other Group 5 CIPs. 5 DG5.3 Upsize ~1,000 LF to 2.5-ft HDPE; upsize ~450
LF to 2-ft HDPE; ~50 LF lateral; 6 new DIs, 1 new MH. Gary St neighborhood; dependent on DG5.1.
No Pacific Ocean at Outfall 5 (via
DG5.1)
No No No Outside coastal zone Developed residential ROW; hydraulically tied to DG5.1
Bundle under DG5.1 CDP and CEQA if applicable; otherwise CEQA cat. exemption ROW pipe upsizing in Gart St neighborhood dependent on DG5.1; bundle environmental permitting with Group 5; minimal scope. $5,000 Tier 1 Bundle permitting with other Group 5 CIPs. 5 DG5.4 Upsize ~1,400 LF to 3-ft HDPE; upsize ~850 LF
to 2.5-ft HDPE; upsize ~700 LF to 2-ft HDPE; ~350 LF lateral; 15 new DIs, 5 new MHs.
No Pacific Ocean at Outfall 5 (via
DG5.1) - verify
No No No Outside coastal zone Developed urban ROW; substantial scale (~3,300 LF)
Bundle under DG5.1 CDP and CEQA if applicable; otherwise CEQA documentation Substantial ROW pipe upsizing; bundle environmental permitting with Group 5; minimal incremental scope. $8,000 Tier 1-2 Bundle with other Group 5 CIPs.
5 DG5.5 Upsize ~450 LF to 1.5-ft HDPE; ~100 LF lateral; 3 new DIs, 1 new MH. Dependent on DG5.1.
No Pacific Ocean at Outfall 5 (via
DG5.1)
No No No Outside coastal zone Small-scale developed residential ROW Bundle under DG5.1 CDP and CEQA if applicable
Small-scale ROW pipe upsizing; lowest environmental scope in Group 5; bundle with other Group 5 CIPs. $2,000 Tier 1 Bundle permitting with other Group 5 CIPs. 6 DG6.1 Upsize ~50 LF to 2-ft HDPE; upsize ~450 LF to
1.5-ft HDPE; ~150 LF lateral; 8 new DIs, 3 new MHs. Outfall to Pacific Ocean south of Brother Jonathan Cemetery.
No Pacific Ocean south of Brother
Jonathan Cemetery (existing outfall, no work proposed at outfall) Yes - within one block of Pacific along Pebble Beach Drive area No No City-issued CDP (LCP); potential
appealable to CCC for western most portion near to the beach Mostly urban ROW City CDP under LCP (likely appealable); Coastal zone CDP with appeal jurisdiction likely. Minimal other requirements expected.
$10,000 Tier 2 Brother Jonathan Cemetery is a
documented historic resource - cultural review and Tolowa Dee-ni' Nation consultation may be needed. 7 DG7.1 Replace ~400 LF of pipe with 1-ft HDPE; 2 new
DIs, 1 new MH. Repairs failed pipe sections leading to Outfall 7 (Pacific Ocean). Outfall protected in place.
No Pacific Ocean at Outfall 7 (existing
outfall not modified)
Yes - within one block of Pacific along A Street/Lighthouse Way area Yes, coastal bluff and potential ESHA
Yes, at western end outfall area City-issued CDP (LCP); likely appealable to CCC (within 300 ft of beach)
Within coastal zone strip near Pacific Ocean; possible coastal bluff/ESHA; small project footprint City CDP under LCP (likely appealable); biological survey for coastal portion; CEQA documentation may be Initial Study / Negative Declaration. May be within US Army Corps jurisdiction which would require CWA 404 and 401 approvals (USACE and Water Board).
Pipe repair leading to existing Outfall 7; appealable City CDP under LCP given coastal zone location; bluff biological survey; outfall protected in place. $60,000 Tier 3 Sediment/debris cleanout at outfall
(separate from pipe repair) may need additional authorization if performed seaward of MHTL. 8 DG8.1 Add ~300 LF 1-ft HDPE (W 5th St & Wendell St
to Outfall 8); upsize ~100 LF to 2-ft HDPE; ~150 LF lateral; 7 new DIs, 2 new MHs. New connection to existing Outfall 8.
No Pacific Ocean at Outfall 8 (existing
outfall, no modification proposed)
Yes - within one block of Pacific along Wendell Street
Potentially the far western portion, but seems unlikley Potentially the far western portion, but seems unlikley City-issued CDP (LCP); likely appealable to CCC (within 300 ft of beach) Within coastal zone along Wendell Street; possible coastal bluff/ESHA at outfall vicinity City CDP under LCP (likely appealable); biological survey for coastal portion; CEQA documentation may be Initial Study / Negative Declaration. May be within US Army Corps jurisdiction which would require CWA 404 and 401 approvals (USACE and Water Board).
New 300 LF connection to existing Outfall 8 within coastal zone strip; appealable City CDP; ESHA verification needed; outfall protected in place. $60,000 Tier 3 New pipe connecting to existing outfall (not new outfall). If connection point seaward of MHTL, escalates to Tier 4. Verify exact terminus. 9 DG9.1 Upsize ~600 LF to 2-ft HDPE; ~150 LF lateral; 5 new DIs, 2 new MHs. Discharges to Pacific Ocean near south end of Wendell St.
No Pacific Ocean near south end of
Wendell Street (existing outfall, no work proposed at outfall) Yes - within one block of Pacific along Wendell Street and A Street Yes at western terminus intersects with native vegetation (potential ESHA) No; near outfall Zone VE City-issued CDP (LCP); likely appealable to CCC
Within coastal zone along Wendell/A Street; possible coastal bluff/ESHA City CDP under LCP (likely appealable); biological survey for coastal portion; CEQA documentation ROW pipe upsizing within coastal zone strip; appealable City CDP under LCP; bluff biological survey; outfall protected in place. $40,000 Tier 2-3 Standard coastal zone CDP profile.
10 DG10.1 Add ~300 LF 4-ft HDPE (Front St to Outfall 10); upsize ~250 LF to 4-ft HDPE; ~50 LF lateral; 5 new DIs, 1 new MH. Outfall to Elk Creek; existing outfall protected in place.
No Elk Creek at Outfall 10 in
Beachfront Park area (existing outfall protected in place per design) Yes - between Front Street and Crescent City Harbor, within coastal zone Yes - Beachfront Park / Elk Creek mouth corridor; possible riparian, ESHA, tidewater goby habitat Yes, Zone AE at eastern terminus City-issued CDP (LCP); likely appealable to CCC
Beachfront Park / Elk Creek mouth corridor; high-resource area; ESA - possible tidewater goby habitat; riparian/ESHA verification needed; cultural resources potential City CDP under LCP (likely appealable); biological assessment (tidewater goby focus, possible ESA Section 7); possible CDFW 1602 if any work in Elk Creek streambed; cultural Phase I; FEMA Floodplain Development Permit; CEQA (IS/MND likely); possibly CWA 404/401; Outfall protected in place per design - favorable; new pipe in Beachfront Park/Elk Creek mouth corridor requires appealable CDP, biological assessment, possible 1602; high-resource area. $80,000 Tier 3-4 Protect in place' favorable for permitting.
Beachfront Park / Elk Creek mouth is highresource (tidewater goby, salmonid, riparian, possibly cultural). DG4.2 and DG4.3 downstream-dependent. Permitting cost dependent upon design ability to avoid habitat.
TOTAL : $783,000
2 Appendix E - Preliminary Assessment of Anticipated Environmental Review and Permitting Requirements Drainage
Group CIP ID Description / Proposed Improvements Within Caltrans ROW? Receiving Water (existing outfall) Within Coastal Zone? (per City LCP) Intersects Natural / Undisturbed Area? Mapped Floodplain Status (FIRM 060039C eff. 08/02/2017) Coastal Jurisdiction Existing Environment/Setting Environmental Permits / Approvals Permitting Narrative Class V Environmental Permitting Cost Tier Key Assumptions / Notes Drainage
Group CIPs Included Lead CIP / Driver Bundled Cost (ROM, $) Notes DG 1 DG1.1 DG1.1 (Caltransled) $10,000 Caltrans-led single project; environmental scope contingent on coastal zone status.
DG 2 DG2.1B, DG2.2, DG2.2B DG2.1B (CDP for
harbor-adjacent segment)
$35,000 Lead is DG2.1B with possible coastal
zone CDP; DG2.2 and DG2.2B ride along under bundled CEQA. Modest savings vs. per-CIP sum.
DG 3 DG3.1A, DG3.1B, DG3.2A, DG3.2B, DG3.2C,
DG3.3A, DG3.3B
DG3.2C (greenway/creek 1602/401 driver) + DG3.3B (Caltrans coordination)
$348,000 Coastal zone. DG3.2C carries
1602/401 burden. DG3.1A floodplain drives FEMA permit. Other CIPs ride along under bundled DG 4 DG4.1A, DG4.1B, DG4.2, DG4.3 DG4.1A CEQA at minimal incremental cost. (downtown grid CEQA)
$20,000 All Group 4 CIPs are in fully
developed downtown grid, likely outside coastal zone. Single bundled CEQA categorical exemption DG 5 DG5.1, DG5.2, DG5.3, DG5.4, DG5.5 DG5.1 (cross-t sufficient. Lowest environmental own interceptor with appealable coastal zone CDP)
$120,000 DG5.1 carries full appealable CDP,
ESHA biological survey, cultural Phase I, and FEMA permit. DG5.2-5.5 ride along under same CDP and DG 6 DG6.1 DG6.1 (cemetery + CEQA at marginal incremental cost bluff)
$10,000 Single project with appealable CDP,
ESHA biological survey, cultural Phase I (cemetery), and tribal consultation potential.
DG 7 DG7.1 DG7.1 (coastal
pipe repair)
$60,000 Single project with appealable CDP
and bluff biological survey. Outfall protected in place.
DG 8 DG8.1 DG8.1 (new
connection to existing outfall)
$60,000 Single project with appealable CDP
and bluff biological survey. New connection (not new outfall) keeps in Tier 3.
DG 9 DG9.1 DG9.1 (coastal
pipe upsize)
$40,000 Single project with appealable CDP
and bluff biological survey.
DG 10 DG10.1 DG10.1 (Elk Creek
mouth corridor)
$80,000 Single project; high-resource area
(tidewater goby, salmonid, riparian); appealable CDP, ESA-level biological assessment, possible 1602, cultural Phase I, FEMA TOTAL (bundled, ROM): $783,000
ENVIRONMENTAL PERMITTING COST BY DRAINAGE GROUP (BUNDLED) Assumes the City permits each Drainage Group as a single application (CDP, CEQA, biological surveys bundled). Lead CIP carries full regulatory effort; ride-along CIPs add only marginal description scope. 3 AACE Class: Class V (Concept Screening)
Project Definition: 0% to 2% complete
Expected Accuracy Range: -50% / +100%
End Use: Long-range capital planning, master plan budgeting Estimating Method: Stochastic / parametric, based on permit-tier assumptions Scope Definition
IN scope: Coastal Development Permit (CDP); USACE 404; RWQCB 401; CDFW 1602; ESA/CESA; Cultural Resources/SHPO/Tribal consultation; CEQA documentation; Biological surveys/ESHA verification; FEMA Floodplain Development Permit OUT of scope: SWPPP/Construction General Permit; Caltrans encroachment permits; City encroachment permits; building/grading permits; easement acquisition; construction contracting
Cost Tier Definitions (environmental
permitting only)
Tier 1 - No environmental triggers $2K - $10K
Description Fully developed ROW outside coastal zone with no surface water/wetland/floodplain impact. Limited to CEQA categorical exemption and confirmation memo. No CDP, no resource agency permits.
Tier 2 - Single environmental trigger $15K - $40K
Description City-issued CDP (not appealable) under LCP, OR a single resource agency permit (FEMA floodplain, CDFW 1602, etc.). Routine biological/cultural memo. CEQA cat. exemption or short-form.
Tier 3 - Appealable CDP or multiple resource
permits
$50K - $120K
Description Appealable CDP (within 300 ft of beach or between sea and first public road); biological assessment for ESHA; possible 1602 + 401; cultural Phase I; CEQA IS/MND.
Tier 4 - Multi-Agency / Resource Impact $120K - $300K
Description CCC retained jurisdiction OR USACE 404 + 401 + 1602 + ESA Section 7 nexus; full CEQA MND. NOT triggered by current CIP scopes as described.
Tier 5 - Major Impact $300K+
Description Individual 404 permit; CCC hearing; ESA formal consultation; full EIR. NOT triggered by current CIP scopes as described.
Excluded from these estimates:
- Construction permits (SWPPP, encroachment, building, grading) - Mitigation construction costs (in-lieu fees, restoration, monitoring beyond 1 yr) - Agency filing fees (varies; add separately)
- Easement acquisition costs
- Construction monitoring / biological monitor field time - Post-construction performance monitoring
Key Citywide Assumptions
LCP status: City of Crescent City has a certified LCP (originally 1984, amended 2010-2011 via CRC-MAJ-1-03). City issues CDPs except in CCC retained jurisdiction.
Coastal zone extent: Approximately 1/10 of city. Most CIPs are OUTSIDE coastal zone.
CCC retained jurisdiction: Tidelands, submerged lands, public trust lands, seaward of MHTL. NO CURRENT CIP triggers this per descriptions provided.
CCC appeal jurisdiction: Between sea and first public road, within 300 ft of beach. Several CIPs trigger this (DG5.1, DG6.1, DG7.1, DG8.1, DG9.1, DG10.1).
Outfall scope assumption: All existing outfalls protected in place per CIP descriptions. No new outfalls or outfall modifications proposed. THIS IS THE SINGLE BIGGEST COST DRIVER - if outfall work added to scope, costs escalate substantially.
Receiving waters: Pacific Ocean (Outfalls 5, 6, 7, 8, 9), Crescent Harbor (Outfall 2), Elk Creek and tributaries (Outfalls 1, 3, 4, 10) Listed species potentially in vicinity: Tidewater goby (Elk Creek mouth), coho salmon (Elk Creek), western snowy plover (beaches), marbled murrelet (verify USFWS list)
Permitting bundling assumption: Per PM, CIPs are intended to be permitted by Drainage Group rather than individually. Bundled section at bottom of CIP Permitting Matrix reflects this assumption.
FIRM reference: FEMA FIRM Community ID 060039C, current effective date 08/02/2017 Class V Cost Estimate - Methodology & Assumptions
Scope: ENVIRONMENTAL permitting only
Permit / Approval Trigger Lead Agency Typical Cost & Timeline (ROM, Class V) Coastal Development Permit (CDP) - City-issued, not appealable Development within Crescent City coastal zone but not in appealable area City of Crescent City $5K-$15K consultant + City fees; 3-6 mo Coastal Development Permit (CDP) - City-issued, appealable to CCC Project between sea and first public road, OR within 300 ft of beach City issues; CCC has appeal jurisdiction
$10K-$30K consultant; 4-9 mo (longer if appealed)
Coastal Development Permit (CDP) - CCC retained jurisdiction Tidelands, submerged lands, public trust lands, seaward of MHTL California Coastal Commission $20K-$60K+ consultant + CCC filing fees; 9-18 mo (NOT triggered by current CIPs as described)
Categorical Exemption (CEQA) Routine in-kind infrastructure replacement with no resource impact
City of Crescent City $2K-$5K consultant; 1-2 mo
Initial Study / Mitigated Negative Declaration (CEQA) Project with potential significant impacts that can be mitigated City of Crescent City $20K-$60K consultant; 4-9 moUSACE Section 404 Permit (NWP or Individual) Discharge of dredged/fill material to waters of the U.S. (postSackett) U.S. Army Corps of Engineers NWP: $8K-$20K, 4-6 mo; IP: $40K-$120K+, 12-24 moRWQCB Section 401 Water Quality Certification Federal permit (404) for discharge to waters of the State North Coast RWQCB $5K-$15K consultant + RWQCB fees; concurrent with 404
CDFW Section 1602 Lake & Streambed Alteration Agreement Work in/under/across bed, bank, or channel of any river, stream, or lake CA Dept. of Fish and Wildlife $5K-$20K consultant + CDFW fees; 3-6 mo FEMA Floodplain Development Permit Work in mapped SFHA per FIRM 060039C eff. 08/02/2017 City Floodplain Administrator $3K-$8K basic FPDP; 2-4 moCultural Resources Survey / SHPO / Tribal Consultation Project near historic resource (e.g., cemetery), federal nexus, or CEQA cultural finding
City / SHPO / Tolowa Dee-ni' Nation $5K-$25K Phase I; Phase II/III if resources found Biological Survey / ESHA Verification Project in coastal zone with potential ESHA (coastal bluff, riparian, wetland)
Consultant; review by City and CCC $5K-$20K survey; included in CDP package ESA Section 7 Consultation Federal nexus + listed species (e.g., tidewater goby, coho, marbled murrelet)
USFWS / NMFS via federal lead BA prep $15K-$50K; consultation 6-18 mo (not anticipated for current CIPs absent federal nexus)
Environmental Permit / Approval Quick Reference
Scope: ENVIRONMENTAL permits only. Construction permits (SWPPP/CGP, encroachment, building, grading) are NOT in environmental scope and not included.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 132 Attachments
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 133 Attachment 1
Crescent City Priority Land Uses
LAKE EARL
PARKWAY
SANDMINE
B
ER
TS
CH
ENDERT DARB
Y
H
U
M
BO
L
T
LE CLAIR
MAHER
NICKEL
OLIVER
PEVELER
QUINLAN
ROY
DODANE
ALPAUGH
MATTHEWS
NORRIS
STATE
SHIRLEY
BENSON
HOWLAND HILL
CIR.
SUNSET
GRANITE
D
U
N
D
A
S
F
E
R
N
D
A
LE
C
ES
SN
A
P
AR
KV
I
E
W
RAILROAD
MERIDIAN
A
M
ADO
R
B
U
T
T
E
CALAVERASDEL
N
O
RT
EE
L
D
O
RAD
O
FR
E
S
NO
G
LE
N
N
H
U
M
BO
L
T
STANTON
JACKIE
CONDOR
ESSEX
SPRUCE
BREAKWATER
LAUFF
MACKEN
BEACH
PEBBLE
RUPERT
DALE
H
A
R
M
O
N
Y
L
AG
O
O
N
VINCENT
ALPINE
OLD MILL
BURKE
E
V
E
R
G
R
E
EN
PINE GROVE
CO
LL
IN
S
SCOTT
SUMMER
C
AR
O
LE
H
O
LBE
N
PINE GROVE
BLACKWELL
HARDING
R
V
I
ER
S
I
D
E
EAST MADISON
JEFFERSON
ADAMS ARLINGTON
DOUGLAS
HARROLD
NORTHCREST
MA
RS
H
A
LL
O
R
E
G
O
N
C
A
L
I
F
O
R
N
A
I
B
R
E
E
N
COOLIDGE
HOOVER
F
R
E
E
M
AN
L
E
LA
G
R
A
N
D
D
E
L
M
O
N
T
E
ANZIO
JACCARD
HUNTINGTON
GARY
M
L
K
J
I
H
G
F
E
D
C
B
A
WENDELL TAYLOR
FRONT 2nd 3rd
4th 5th
6th 7th
8th
9th
10th
REDDY
KELLER
MURPHY
PACIFIC
MACKEN
LAUFF
COOPER
CHILDS
JOAQUIN KERN
M
O
D
O
C
EL MONTE
WASHINGTON BLVD.
OLD
MILL
WYENTAE
RAILROAD
Crescent City Harbor
CastleRock
BatteryPoint
WhalerRock
BIA
BIA
BIA
BIA
BIA
BIA
20 - Pelican Bay State Prison19 - Crescent City Municipal Wastewater Treatment Plant18 - Convention Center16 - Crescent Elk School 5 - Pine Grove School4 - Mary Peacock School3 - County Landfill (Crescent City Landfill)2 - County Airport (McNamara Field)1 - County Park (Point St. George Access) 15 - Joe Hamilton School14 - Public Utility Center13 - County Park (Pebble Beach Access)11 - Juvenile Detention Facility10 - Bess Maxwell School 9 - City Water Storage Tank8 - Crescent Fire/Emergency Services Center7 - Del Norte High School6 - Community College (College of the Redwoods) 17 - County Park (Macken Ballfields)12 - Del Norte County Fairgrounds Public Facilities Index
Crescent City City Limit
Planning Area Boundary
Urban Boundary
Coastal Zone Boundary
Single Family (0-2)Single Family (2-6)Multi-Family (6-15)Multi-Family (15-30)Mobilehome Park Residential
Business-ProfessionalVisitor and Local CommercialGeneral Commercial Commercial
General IndustrialLight Industrial
Industrial
Public
Public Facilities and Tribal Lands
County Rural DevelopmentCounty Resources
Countywide Designation
Harbor RelatedHarbor DependentHarbor Dependent RecreationHarbor Dependent Commercial Harbor
Open SpaceNatural Resources
Conservation and Open Space
Urban Reserve Overlay
Overlays
1 inch = 2750 feet
Prepared by:
City of Crescent City
General Plan
Land Use Diagram
May 21, 2001
N
W E
S
2000 0 2000 4000 6000 Feet
/(101
Lake
Earl
Drive
1 inch = 5,000 feet
Pelican Bay 500 0 500 1000 1500 2000 Feet
State Prison
500 0 500 1000 1500 2000 Feet
1 inch = 5,000 feet
Southern Planning
Area Boundary
Crescent City Land Use Designations
1 inch = 2750 feet
1 2
3 5
4 8 9
7 6
10 11
12 16
15 13
20 13
13 13
19 18
17 14
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 134 Attachment 2
NOAA-14 Precipitation Frequency
Estimates
NOAA Atlas 14, Volume 6, Version 2
Location name: Crescent City, California, USA*
Latitude: 41.753°, Longitude: -124.2013°
Elevation: m/ft**
* source: ESRI Maps
** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, Sandra Pavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, Geoffrey Bonnin, Daniel Brewer, Li-Chuan Chen, Tye Parzybok, John Yarchoan NOAA, National Weather Service, Silver Spring, Maryland PF_tabular | PF_graphical | Maps_&_aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches) 1 Duration
Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
5-min 0.170
(0.148‑0.197)
0.220
(0.192‑0.256)
0.286
(0.248‑0.333)
0.338
(0.291‑0.398)
0.410
(0.339‑0.500)
0.464
(0.375‑0.580)
0.519
(0.408‑0.667)
0.575
(0.439‑0.762)
0.651
(0.474‑0.902)
0.709
(0.497‑1.02)
10-min 0.244
(0.212‑0.283)
0.316
(0.275‑0.367)
0.409
(0.355‑0.477)
0.485
(0.417‑0.570)
0.587
(0.486‑0.717)
0.665
(0.538‑0.831)
0.744
(0.585‑0.955)
0.825
(0.629‑1.09)
0.933
(0.679‑1.29)
1.02 (0.712‑1.46)
15-min 0.295
(0.257‑0.342)
0.382
(0.332‑0.443)
0.495
(0.429‑0.577)
0.587
(0.504‑0.690)
0.710
(0.588‑0.867)
0.805
(0.650‑1.00)
0.900
(0.708‑1.16)
0.997
(0.761‑1.32)
1.13 (0.822‑1.56)
1.23 (0.861‑1.77)
30-min 0.400
(0.349‑0.464)
0.518
(0.451‑0.602)
0.672
(0.583‑0.783)
0.796
(0.684‑0.936)
0.964
(0.798‑1.18)
1.09 (0.883‑1.36)
1.22 (0.961‑1.57)
1.35 (1.03‑1.79)
1.53 (1.12‑2.12)
1.67 (1.17‑2.40)
60-min 0.564
(0.491‑0.655)
0.731
(0.635‑0.849)
0.947
(0.821‑1.10)
1.12 (0.964‑1.32)
1.36 (1.12‑1.66)
1.54 (1.24‑1.92)
1.72 (1.36‑2.21)
1.91 (1.46‑2.53)
2.16 (1.57‑2.99)
2.35 (1.65‑3.39)
2-hr 0.838
(0.730‑0.972)
1.06 (0.918‑1.23)
1.34 (1.16‑1.56)
1.57 (1.34‑1.84)
1.87 (1.55‑2.28)
2.10 (1.70‑2.63)
2.34 (1.84‑3.00)
2.58 (1.97‑3.42)
2.90 (2.11‑4.02)
3.14 (2.20‑4.53)
3-hr 1.09
(0.948‑1.26)
1.35 (1.18‑1.57)
1.70 (1.47‑1.98)
1.97 (1.69‑2.32)
2.34 (1.94‑2.86)
2.62 (2.12‑3.27)
2.90 (2.28‑3.72)
3.19 (2.43‑4.22)
3.57 (2.60‑4.95)
3.86 (2.70‑5.56)
6-hr 1.73
(1.50‑2.00)
2.12 (1.84‑2.46)
2.62 (2.27‑3.05)
3.01 (2.59‑3.54)
3.54 (2.93‑4.32)
3.94 (3.18‑4.92)
4.33 (3.41‑5.56)
4.73 (3.61‑6.27)
5.26 (3.83‑7.29)
5.66 (3.97‑8.15)
12-hr 2.47
(2.15‑2.86)
3.05 (2.65‑3.54)
3.79 (3.29‑4.42)
4.37 (3.76‑5.14)
5.13 (4.25‑6.26)
5.70 (4.60‑7.12)
6.25 (4.92‑8.02)
6.80 (5.19‑9.01)
7.52 (5.48‑10.4)
8.06 (5.65‑11.6)
24-hr 3.46
(3.09‑3.96)
4.35 (3.88‑4.98)
5.46 (4.86‑6.27)
6.32 (5.58‑7.30)
7.44 (6.38‑8.84)
8.25 (6.95‑9.98)
9.04 (7.46‑11.2)
9.81 (7.91‑12.4)
10.8 (8.40‑14.2)
11.6 (8.71‑15.6)
2-day 4.85
(4.33‑5.54)
6.07 (5.41‑6.95)
7.58 (6.74‑8.70)
8.75 (7.72‑10.1)
10.2 (8.79‑12.2)
11.3 (9.55‑13.7)
12.4 (10.2‑15.3)
13.4 (10.8‑17.0)
14.7 (11.4‑19.3)
15.7 (11.8‑21.2)
3-day 5.70
(5.09‑6.52)
7.12 (6.34‑8.15)
8.86 (7.88‑10.2)
10.2 (9.01‑11.8)
11.9 (10.2‑14.2)
13.2 (11.1‑15.9)
14.3 (11.8‑17.7)
15.5 (12.5‑19.6)
17.0 (13.2‑22.3)
18.1 (13.6‑24.4)
4-day 6.46
(5.77‑7.39)
8.07 (7.19‑9.24)
10.0 (8.93‑11.5)
11.6 (10.2‑13.3)
13.5 (11.6‑16.0)
14.8 (12.5‑18.0)
16.2 (13.3‑20.0)
17.4 (14.0‑22.1)
19.0 (14.8‑25.0)
20.2 (15.2‑27.4)
7-day 8.02
(7.15‑9.17)
10.1 (8.96‑11.5)
12.5 (11.1‑14.4)
14.4 (12.7‑16.6)
16.7 (14.3‑19.9)
18.3 (15.5‑22.2)
19.9 (16.4‑24.6)
21.4 (17.2‑27.1)
23.2 (18.0‑30.5)
24.5 (18.5‑33.2)
10-day 9.43
(8.41‑10.8)
11.8 (10.6‑13.6)
14.7 (13.1‑16.9)
16.9 (14.9‑19.5)
19.6 (16.8‑23.3)
21.4 (18.1‑25.9)
23.2 (19.1‑28.6)
24.8 (20.0‑31.4)
26.9 (20.9‑35.3)
28.3 (21.3‑38.3)
20-day 13.0
(11.6‑14.9)
16.3 (14.5‑18.7)
20.1 (17.9‑23.1)
22.9 (20.2‑26.5)
26.3 (22.6‑31.3)
28.6 (24.1‑34.7)
30.8 (25.4‑38.0)
32.8 (26.4‑41.5)
35.2 (27.3‑46.2)
36.8 (27.8‑49.9)
30-day 16.5
(14.7‑18.9)
20.4 (18.2‑23.4)
24.9 (22.2‑28.6)
28.2 (24.9‑32.6)
32.2 (27.6‑38.3)
34.9 (29.4‑42.2)
37.3 (30.8‑46.2)
39.6 (31.9‑50.2)
42.3 (32.9‑55.5)
44.1 (33.3‑59.7)
45-day 21.5
(19.2‑24.6)
26.2 (23.4‑30.0)
31.6 (28.1‑36.3)
35.5 (31.4‑41.0)
40.2 (34.5‑47.7)
43.3 (36.5‑52.4)
46.1 (38.0‑57.0)
48.6 (39.2‑61.6)
51.7 (40.2‑67.9)
53.7 (40.5‑72.7)
60-day 26.0
(23.2‑29.7)
31.3 (27.9‑35.8)
37.3 (33.2‑42.8)
41.6 (36.8‑48.1)
46.7 (40.1‑55.5)
50.1 (42.2‑60.7)
53.2 (43.9‑65.7)
55.9 (45.1‑70.9)
59.2 (46.0‑77.7)
61.4 (46.3‑83.1)
1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
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GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 135 Attachment 3
Subcatchment Parameters
The Power of Commitment
12588710 | Crescent City Storm Drain Master Plan 1
Table 1 Subcatchment Parameters – Base Conditions
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S1 DI182 5.2523 463.338 493.787 3.08 85 95.147
S10 DI056 1.8406 509.906 157.238 3.719 80 93.2
S11 I185 96.9426 412.874 10227.87 8.414 23.262 77.074
S11_1 DI215 94.0113 412.004 9939.545 6.677 33 80.865
S12 DI042 2.9905 471.716 276.154 1.566 63 89.109
S12_2 I192 9.8782 472.676 910.337 1.554 74 91.332
S13 I095 25.3853 503.295 2197.089 8.201 32.404 80.295
S14_1 DI050 0.7994 457.118 76.177 5.333 28 80.72
S14_2 DI064 0.9996 457.121 95.254 5.333 83 94.77
S14_3 DI062 1.3034 457.12 124.204 5.333 19 78.56
S14_4 DI066 1.8724 457.121 178.425 5.333 87 94.88
S14_5 DI063 4.2255 457.121 402.657 5.333 72 91.28
S14_6 DI065 1.0799 457.121 102.906 5.333 54 86.96
S14_8 DI067 0.7473 457.119 71.212 5.333 100 98
S14_9 DI068 6.2202 298.396 908.028 7.274 30 80.426
S15 DI069 5.8785 271.843 941.968 3.324 11 76.19
S16 DI052 3.4716 487.995 309.886 1.36 86 94.64
S16_1 DI209 0.8024 380.225 91.926 3.647 53 86.72
S16_3 DI200 1.2476 380.224 142.93 3.647 56 88.159
S17_1 DI516 1.8152 335.93 235.377 3.124 41 90.174
S17_2 DI214 3.5402 335.929 459.059 3.124 41 90.174
S18 DI071 7.6242 360.823 920.424 3.355 8 72.918
S19 DI072 6.3708 314.379 882.731 3.638 17 72.798
S2 I070 5.7114 438.889 566.86 6.688 19 77.596
S20 DI081 0.8733 370.78 102.597 4.067 48 85.97
S21_1 J42 0.1797 84.1 93.076 4.595 86 93.046
S21_2 DI075 0.6697 313.419 93.077 4.595 86 93.046
S22 DI142 11.047 372.523 1291.752 7.289 28 78.59
S22_1 DI105 2.3718 497.214 207.789 4.439 82 93.05
S22_3 DI107 1.9008 497.213 166.526 4.439 97 97.102
S22_5 DI106 0.8619 497.21 75.51 4.439 76 90.878
S23 DI120 0.1086 341.511 13.852 4.396 0 73.125
S24_1 DI082 1.1043 333.324 144.314 4.963 11 76.85
12588710 | Crescent City Storm Drain Master Plan 2
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S24_2 J11 0.1747 52.732 144.313 4.963 11 76.85
S25_1 DI296 1 268.773 162.07 4.64 68 90.32
S25_2 DI299 0.9556 268.773 154.874 4.64 100 98
S25_4 DI165 51.2051 406.791 5483.145 6.078 39 82.884
S27 DI287 0.1103 378.052 12.709 3.983 100 98
S279_1 I113 1.9385 479.534 176.09 3.772 56 87.53
S279_3 DI500 9.9361 479.533 902.579 3.772 98 97.58
S279_4 DI499 4.9057 479.533 445.626 3.772 81 93.638
S28 DI313 0.3045 353.82 37.488 3.801 77 92.48
S28_1 DI251 9.7993 514.924 828.972 4.259 69 90.56
S29_2 J3 1.3823 104.466 576.388 5.27 59 88.16
S29_3 J4 1.0898 82.361 576.386 5.27 59 88.16
S29_4 DI367 1.02 77.086 576.385 5.27 59 88.16
S3 I092 4.0683 263.487 672.576 11.791 9 70.96
S3_10 DI189 1.3153 514.078 111.451 3.563 95 96.8
S3_11 DI208 2.6233 514.079 222.283 3.563 44 84.379
S3_2 DI237 4.7344 351.959 585.95 6.942 58 88.25
S3_5 DI238 2.4558 351.959 303.941 6.942 46 85.332
S3_6
CreekStor
age 48.4091 351.959 5991.324 6.942 22 76.702
S3_7 DI191 1.6999 514.077 144.04 3.563 99 97.79
S3_8 DI193 2.4955 514.079 211.454 3.563 100 98
S3_9 DI194 9.6167 514.078 814.864 3.563 86 96.54
S30_1 DI361 1.9612 453.517 188.372 4.072 68 90.32
S30_2 DI530 0.2751 488.18 24.547 1.347 42 84.08
S30_3 DI051 1.3821 499.575 120.511 0.53 44 84.56
S30_5 DI531 1.3514 488.182 120.584 1.347 42 84.08
S30_6 DI044 1.3087 488.182 116.774 1.347 42 84.08
S31 DI054 5.6314 487.995 502.677 1.36 67 89.981
S31_1 DI043 2.8892 487.996 257.899 1.36 38 83.12
S31_3 DI053 5.2826 487.995 471.542 1.36 47 85.015
S31_4 DI045 2.2527 487.996 201.083 1.36 34 82.34
S31_5 DI046 2.7888 487.995 248.937 1.36 32 81.68
S31_8 DI047 5.4637 487.995 487.707 1.36 38 83.047
S31_9 DI054 0.4095 487.999 36.553 1.36 100 98
S32 DI037 4.0058 467.981 372.863 1.614 53 86.84
S33_1 J5 1.121 95.511 511.258 5.459 71 91.07
S33_2 DI030 2.0854 177.68 511.256 5.459 71 91.07
12588710 | Crescent City Storm Drain Master Plan 3
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S338 I114 4.8968 383.045 556.866 4.835 40 83.66
S34 DI328 0.3436 378.084 39.587 5.135 100 98
S344_1 DI234 2.0572 364.173 246.069 9.894 41 82.983
S35 DI330 0.3459 376.046 40.068 5.044 99 97.79
S35_1 DI258 0.4024 490.295 35.751 5.665 66 89.218
S35_10 DI153 0.5448 490.29 48.403 5.665 100 98
S35_11 DI293 7.1321 490.294 633.649 5.665 14 77.033
S35_12 DI265 0.715 490.293 63.524 5.665 54 85.52
S35_14 DI070 2.034 490.294 180.71 5.665 78 92.72
S35_15 J29 1.0106 490.296 89.786 5.665 55 87.53
S35_16 DI263 0.3305 490.297 29.363 5.665 100 98
S35_17 DI099 2.4241 490.295 215.368 5.665 46 84.527
S35_18 DI488 0.3662 490.293 32.535 5.665 89 94.975
S35_19 DI276 0.1711 490.304 15.201 5.665 100 98
S35_2 DI256 2.0842 490.294 185.17 5.665 100 98
S35_20 DI267 0.5921 490.293 52.605 5.665 46 83.15
S35_21 DI268 0.5905 490.292 52.463 5.665 75 91.125
S35_22 DI283 1.6234 490.295 144.23 5.665 57 87.217
S35_23 DI273 0.3938 490.294 34.987 5.665 100 98
S35_24 DI275 0.3639 490.287 32.331 5.665 100 98
S35_25 DI270 0.5436 490.294 48.296 5.665 100 98
S35_26 DI274 0.7056 490.292 62.689 5.665 99 97.773
S35_27 DI277 0.5055 490.294 44.911 5.665 72 90.738
S35_28 DI284 0.9985 490.296 88.711 5.665 81 93.366
S35_29 DI301 1.9692 490.294 174.953 5.665 80 93.2
S35_3 DI259 1.375 490.296 122.161 5.665 53 86.21
S35_30 DI278 0.221 490.286 19.635 5.665 70 90.8
S35_31 DI282 0.1997 490.302 17.742 5.665 44 84.56
S35_32 DI285 0.4954 490.29 44.014 5.665 82 93.68
S35_33 DI300 1.1567 490.292 102.767 5.665 88 95.12
S35_34 DI302 1.1478 490.293 101.976 5.665 14 77.36
S35_35 DI159 0.5527 143.447 167.836 5.665 43 83.888
S35_36 DI297 2.2682 490.295 201.517 5.665 48 86.17
S35_37 J22 0.1729 102.344 73.59 5.665 95 76.88
S35_38 DI294 0.9065 490.292 80.538 5.665 84 94.16
S35_39 SP4 0.6554 387.95 73.59 5.665 12 76.88
S35_4 DI257 0.3167 490.296 28.137 5.665 92 95.95
12588710 | Crescent City Storm Drain Master Plan 4
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S35_40 DI298 1.3581 490.294 120.66 5.665 77 92.48
S35_41 J25 0.5226 240.726 94.566 5.665 73 92.87
S35_42 DI122 0.979 254.089 167.836 5.665 43 83.888
S35_43 DI136 0.5419 249.616 94.566 5.665 73 92.87
S35_5 DI261 1.7953 490.293 159.503 5.665 33 81.403
S35_6 DI260 0.2506 490.304 22.264 5.665 100 98
S35_7 DI262 2.0398 490.295 181.225 5.665 80 92.883
S35_8 DI178 2.0936 490.294 186.005 5.665 38 83.1
S35_9 DI522 0.3574 92.759 167.836 5.665 43 83.888
S356_2 I111 4.8611 438.668 482.71 4.268 27 79.772
S356_3 DI229 2.1535 438.668 213.844 4.268 55 86.683
S356_4 DI230 2.3207 438.668 230.447 4.268 55 86.787
S36 DI306 0.4365 350.597 54.233 3.55 100 98
S37 DI032 1.1784 292.358 175.576 3.844 97 97.28
S37_1 DI248 1.0455 419.912 108.456 3.768 48 84.32
S37_2 DI264 0.9503 419.913 98.58 3.768 41 83.84
S38_1 DI288 0.9219 397.285 101.081 3.699 84 94.16
S38_11 DI505 0.7506 421.174 77.631 4.558 97 97.31
S38_12 I034 0.1502 421.159 15.535 4.558 96 97.04
S38_13 I536 3.7502 298.985 546.378 4.865 39 85.76
S38_14 DI101 0.5481 410.566 58.152 5.768 100 98
S38_15 DI166 0.1773 410.568 18.811 5.768 100 98
S38_16 DI173 3.3855 410.567 359.192 5.768 81 92.19
S38_17 DI169 0.4691 410.569 49.77 5.768 51 82.545
S38_18 DI168 3.6166 410.567 383.711 5.768 67 88.158
S38_19 DI172 0.2731 410.569 28.975 5.768 95 97.5
S38_2 DI295 0.5965 397.284 65.403 3.699 100 98
S38_20 DI161 2.0464 410.568 217.117 5.768 71 91.04
S38_21 DI160 0.979 410.568 103.869 5.768 84 93.948
S38_22 DI135 1.4376 410.568 152.525 5.768 96 96.95
S38_23 DI171 0.8286 410.568 87.912 5.768 70 91.406
S38_24 DI167 1.9404 410.567 205.871 5.768 8 78.22
S38_25 DI156 0.9018 410.569 95.678 5.768 69 90.2
S38_26 DI084 0.5324 410.568 56.486 5.768 100 98
S38_27 DI157 1.0765 410.566 114.214 5.768 81 93.44
S38_28 DI155 1.1017 410.568 116.887 5.768 95 96.799
S38_29 DI139 2.6435 410.567 280.468 5.768 99 97.738
12588710 | Crescent City Storm Drain Master Plan 5
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S38_3 DI281 0.9353 397.286 102.55 3.699 88 95.12
S38_30 DI083 1.4611 410.566 155.019 5.768 67 90.666
S38_31 DI141 2.8793 410.566 305.486 5.768 87 94.425
S38_32 DI149 0.9173 410.567 97.323 5.768 93 96.31
S38_33 DI079 0.1442 88.032 71.353 4.558 66 91.157
S38_34 DI146 1.0602 410.568 112.484 5.768 99 97.779
S38_35 DI144 0.6915 410.568 73.366 5.768 100 98
S38_36 DI145 0.5402 410.565 57.314 5.768 100 98
S38_37 DI147 1.1594 410.567 123.009 5.768 98 97.488
S38_38 DI154 1.9496 410.567 206.847 5.768 96 97.011
S38_39 DI148 0.879 410.569 93.259 5.768 100 98
S38_4 DI218 0.5672 397.286 62.19 3.699 15 77.6
S38_40 DI140 0.6892 410.568 73.122 5.768 82 94.154
S38_41 DI150 0.3359 410.567 35.638 5.768 100 98
S38_42 DI138 5.0878 410.567 539.801 5.768 92 95.88
S38_43 DI092 1.0454 410.567 110.914 5.768 100 98
S38_44 DI137 0.5424 410.568 57.547 5.768 95 96.838
S38_45 DI134 2.5499 410.567 270.537 5.768 100 98
S38_46 DI089 0.4207 410.568 44.635 5.768 100 98
S38_47 DI132 0.3673 410.572 38.969 5.768 100 98
S38_48 DI143 0.5091 410.568 54.014 5.768 98 97.58
S38_49 DI133 0.3173 410.563 33.665 5.768 100 98
S38_5 DI504 0.5462 421.173 56.491 4.558 100 98
S38_50 DI091 0.4918 410.564 52.179 5.768 100 98
S38_51 J10 0.5344 410.569 56.698 5.768 100 98
S38_52 DI128 7.2386 410.567 767.995 5.768 76 91.64
S38_53 DI103 0.2024 410.568 21.474 5.768 100 98
S38_54 DI095 0.5654 410.569 59.987 5.768 100 98
S38_55 DI123 0.8139 410.569 86.352 5.768 100 98
S38_56 DI100 0.7427 410.569 78.798 5.768 22 76.55
S38_57 DI503 0.6559 410.568 69.589 5.768 6 72.15
S38_58 DI125 0.4436 410.564 47.065 5.768 100 98
S38_59 DI124 0.0637 410.591 6.758 5.768 90 95.25
S38_6 DI227 0.5629 397.283 61.719 3.699 10 76.4
S38_60 DI098 0.1104 410.572 11.713 5.768 100 98
S38_61 DI104 0.2156 410.559 22.875 5.768 60 87
S38_62 I049 1.8853 410.567 200.025 5.768 38 73.729
12588710 | Crescent City Storm Drain Master Plan 6
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S38_63 DI501 3.3371 483.461 300.674 4.65 51 82.68
S38_64 DI130 0.9467 410.568 100.442 5.768 95 96.646
S38_65 DI102 0.8996 410.567 95.445 5.768 0 70.5
S38_66 DI131 0.4092 410.567 43.415 5.768 96 96.9
S38_67 DI096 0.758 410.565 80.422 5.768 100 98
S38_68 DI093 1.0422 410.569 110.574 5.768 97 97.175
S38_69 DI090 0.4629 410.57 49.112 5.768 86 94.47
S38_7 MH053 0.8637 360.987 104.222 4.558 97 97.37
S38_70 I063 13.3646 410.567 1417.946 5.768 10 73.37
S38_71 DI097 0.4956 410.565 52.582 5.768 100 98
S38_72 DI129 0.8784 410.566 93.196 5.768 97 97.175
S38_73 DI126 1.6033 410.566 170.106 5.768 30 80.19
S38_74 DI127 0.5453 410.566 57.855 5.768 100 98
S38_75 I707 0.5349 410.57 56.751 5.768 38 73.729
S38_76 I060 1.6068 483.462 144.773 4.65 51 82.68
S38_77 DI086 0.0612 112.271 23.745 5.768 100 98
S38_78 DI088 0.1627 298.472 23.745 5.768 100 98
S38_79 J39 0.5457 333.142 71.353 4.558 66 91.157
S38_8 DI537 0.8917 298.986 129.914 4.865 0 75.8
S38_80 DI078 0.144 60.185 104.223 4.558 97 97.37
S38_9 DI489 0.5723 421.176 59.19 4.558 100 98
S39 DI207 3.7809 388.993 423.391 3.739 100 98
S39_1 DI312 7.3804 336.71 954.799 3.62 33 82.86
S39_10 DI205 1.1276 388.994 126.27 3.739 91 95.71
S39_11 DI203 15.4854 388.993 1734.078 3.739 54 86.698
S39_3 DI206 11.2608 388.993 1261.001 3.739 89 95.354
S39_4 DI204 15.2926 388.993 1712.488 3.739 63 88.918
S39_5 DI195 2.5264 388.993 282.91 3.739 100 98
S39_6 DI199 0.1583 388.986 17.727 3.739 100 98
S39_7 DI198 0.3359 388.989 37.615 3.739 100 98
S39_8 DI197 1.5265 388.992 170.94 3.739 98 97.52
S39_9 DI196 1.8745 388.993 209.909 3.739 97 97.28
S398 DI231 4.7467 407.779 507.055 3.845 59 87.33
S4 DI244 6.2693 315.424 865.789 3.772 38 83.12
S40 DI109 7.2392 480.918 655.703 8.482 48 75.844
S407_1 DI213 4.7348 333.967 617.57 4.399 28 81.655
S41 DI031 6.1612 467.98 573.49 1.614 21 77.63
12588710 | Crescent City Storm Drain Master Plan 7
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S41_1 DI235 0.6468 407.743 69.099 10.224 98 97.465
S41_2 DI236 4.4102 407.74 471.154 10.224 19 76.319
S42 DI158 8.2121 381.275 938.218 4.605 58 87.92
S43 DI003 0.4504 504.68 38.875 5.596 89 95.358
S430 DI232 2.7773 317.659 380.846 6.861 75 91.848
S433_1 DI217 2.0129 336.083 260.894 5.662 96 96.9
S433_3 DI216 0.6034 336.084 78.207 5.662 49 87.035
S433_4 I103 4.7217 336.083 611.984 5.662 13 74.66
S44 DI335 4.7355 362.926 568.376 4.416 35.704 61.432
S45 DI359 7.7188 440.303 763.635 4.081 5.299 75.934
S456 I105 0.8379 130.39 279.921 14.847 22 73.535
S461_1 DI222 0.9753 279.462 152.021 4.58 59 87.765
S461_3 DI224 3.7447 279.462 583.69 4.58 68 89.752
S461_4 DI223 1.3558 279.462 211.33 4.58 74 91.039
S462 DI498 6.4382 517.619 541.804 3.543 72 91.443
S484_1 DI226 0.9227 231.381 173.708 5.741 40 83.06
S484_2 DI225 2.6646 231.382 501.638 5.741 71 90.042
S5 DI536 10.0792 344.749 1273.535 4.506 42 85.48
S5_1 DI242 0.6639 311.73 92.771 3.818 83 96.13
S5_2 DI249 7.9316 311.729 1108.336 3.818 40 83.78
S5_3 DI245 0.4244 311.73 59.304 3.818 84 94.94
S5_4 DI241 7.6675 350.819 952.047 3.327 69 90.56
S5_5 DI243 0.4917 311.727 68.709 3.818 89 96.79
S5_6 DI247 1.5721 311.729 219.68 3.818 0 82.6
S5_7 DI240 0.8227 261.89 136.839 3.303 100 98
S5_8 DI239 1.2114 261.891 201.491 3.303 36 83.27
S517 DI221 2.5175 388.647 282.164 9.216 9 73.685
S597_1 DI190 0.6415 499.969 55.891 5.072 89 95.36
S597_2 DI181 1.4558 499.966 126.838 5.072 84 94.033
S597_3 DI374 0.4553 499.971 39.668 5.072 79 92.96
S6 DI021 0.8988 504.962 77.534 5.597 9 76.16
S6_1 DI525 1.3546 504.962 116.853 5.597 50 86
S6_10 DI254 2.8169 364.381 336.747 3.151 82 93.68
S6_13 DI035 2.9427 467.98 273.909 1.614 69 90.56
S6_14 DI039 2.8417 467.98 264.508 1.614 71 91.04
S6_16 DI040 2.8737 467.979 267.487 1.614 69 90.56
S6_17 DI031 0.2541 467.977 23.652 1.614 100 98
12588710 | Crescent City Storm Drain Master Plan 8
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S6_18 DI041 3.2801 467.979 305.315 1.614 71 91.039
S6_2 DI057 8.4862 358.617 1030.79 4.892 54 86.96
S6_20 DI372 0.3057 467.977 28.455 1.614 100 98
S6_23 DI360 4.3802 364.381 523.632 3.151 11 77.03
S6_24 DI371 4.1458 467.98 385.895 1.614 38 82.194
S6_25 I004 1.6487 467.981 153.462 1.614 53 85.075
S6_26 DI029 0.3089 467.975 28.753 1.614 62 88.622
S6_27 DI368 0.45 467.985 41.886 1.614 26 77.65
S6_28 DI370 2.011 467.979 187.186 1.614 31 79.025
S6_29 DI369 0.5595 467.978 52.079 1.614 50 84.25
S6_3 DI491 1.8815 449.091 182.498 4.11 59 88.16
S6_30 DI365 0.9296 467.98 86.528 1.614 54 85.35
S6_31 DI001 0.8977 449.211 87.05 3.806 78 92.72
S6_32 DI366 1.6488 467.979 153.472 1.614 57 86.175
S6_33 DI023 1.9811 467.979 184.403 1.614 39 80.73
S6_34 DI022 1.665 467.979 154.98 1.614 64 88.567
S6_35 DI018 2.6848 421.833 277.242 7.488 50 86.92
S6_36 DI025 1.1269 449.209 109.276 3.806 46 83.84
S6_37 DI002 0.2694 449.206 26.124 3.806 100 98
S6_38 DI024 1.8562 449.21 179.996 3.806 57 87.856
S6_39 DI002 6.6302 449.211 642.931 3.806 48 85.053
S6_4 DI524 0.5043 504.961 43.503 5.597 50 86
S6_40 DI116 0.7343 275.031 116.3 5.62 36 80.405
S6_42 DI020 1.5163 421.832 156.579 7.488 13 76.675
S6_43 DI016 2.0582 275.032 325.981 5.62 29 79.836
S6_44 DI017 1.9938 275.032 315.781 5.62 49 85.403
S6_45 DI353 5.9646 364.381 713.039 3.151 0 75.17
S6_46 DI014 1.2837 275.033 203.314 5.62 53 85.081
S6_47 DI007 2.1521 504.964 185.648 5.597 42 84.08
S6_48 DI019 0.2413 504.974 20.815 5.597 19 78.56
S6_5 DI034 1.1897 467.981 110.738 1.614 51 86.24
S6_50 DI009 1.941 504.963 167.438 5.597 67 90.34
S6_52 DI036 0.5684 504.966 49.032 5.597 9 76.16
S6_53 DI034 4.1795 467.98 389.032 1.614 62 88.88
S6_54 DI008 0.457 504.957 39.423 5.597 15 77.6
S6_55 DI373 3.2072 467.98 298.529 1.614 63 88.876
S6_6 DI033 5.9881 467.98 557.378 1.614 72 91.28
12588710 | Crescent City Storm Drain Master Plan 9
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S6_7 DI322 2.4704 364.382 295.324 3.151 29 83.17
S6_8 DI253 0.3042 364.377 36.366 3.151 100 98
S6_9 DI255 2.2449 364.381 268.367 3.151 79 92.96
S613_1 DI188 0.3118 345.493 39.312 4.411 100 98
S613_2 DI187 2.419 345.492 304.99 4.411 91 95.798
S626 DI183 0.7148 176.868 176.045 8.903 12 79.276
S650_1 J2 2.2491 214.581 456.568 6.663 82 94.1
S650_2 DI184 0.3382 214.58 68.655 6.663 82 94.1
S653 DI186 6.1661 496.34 541.152 7.765 64 90.159
S692 DI363 3.3823 222.995 660.701 3.939 61 88.64
S7 DI085 0.629 375.553 72.957 4.618 0 77.9
S7_6 DI119 0.7056 497.208 61.817 4.451 100 98
S712 I087 1.7953 242.664 322.27 4.37 74 91.493
S714_2 DI179 0.5739 275.172 90.849 9.801 100 98
S714_3 DI177 1.4771 275.172 233.826 9.801 80 92.5
S714_4 DI176 0.3764 275.174 59.584 9.801 100 98
S714_5 DI180 0.4174 275.171 66.075 9.801 98 97.453
S714_6 DI511 0.3073 275.171 48.646 9.801 98 97.453
S741_3 DI163 0.8852 600.678 64.193 3.336 100 98
S741_4 DI162 0.9569 600.674 69.393 3.336 21 79.04
S741_5 DI164 1.2751 600.677 92.468 3.336 71 91.04
S750 DI174 4.446 292.579 661.933 4.434 72 90.602
S771 DI252 6.9228 475.579 634.084 4.605 58 88.19
S776 DI515 3.4601 274.764 548.551 10.047 0 67.305
S797_2 DI060 0.9738 366.219 115.829 4.111 54 86.96
S797_4 DI058 2.9662 366.218 352.816 4.111 56 87.44
S797_5 DI059 1.791 366.219 213.031 4.111 35 82.4
S8 DI038 3.0966 467.981 288.234 1.614 56 87.437
S8_1 DI344 3.1517 374.299 366.787 3.43 53 88.93
S8_11 DI233 2.7734 226.081 534.363 4.5 72 91.28
S8_13 DI250 0.5304 419.916 55.021 3.768 100 98
S8_16 DI333 0.4784 374.299 55.675 3.43 89 95.36
S8_5 DI272 2.0186 292.358 300.762 3.844 76 92.24
S8_8 DI185 2.97 226.081 572.243 4.5 44 84.56
S821_1 DI351 1.9802 256.286 336.567 6.035 81 93.081
S821_2 DI350 1.1485 256.286 195.206 6.035 87 94.523
S821_4 DI152 1.0733 256.286 182.425 6.035 73 91.479
12588710 | Crescent City Storm Drain Master Plan 10
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S821_5 DI151 0.744 256.286 126.455 6.035 19 77.624
S824 DI316 0.135 378.052 15.555 3.983 100 98
S824_1 DI266 6.1558 378.061 709.268 3.983 70 90.753
S824_10 DI280 0.3167 378.061 36.49 3.983 96 96.9
S824_11 DI286 0.1972 378.066 22.721 3.983 100 98
S824_12 DI291 0.2612 378.065 30.095 3.983 94 96.414
S824_13 DI290 0.3765 378.062 43.38 3.983 91 95.649
S824_14 DI496 0.9248 378.061 106.555 3.983 100 98
S824_2 DI305 0.7034 378.063 81.045 3.983 38 83.12
S824_3 DI307 1.1215 378.06 129.219 3.983 100 98
S824_4 DI289 0.7194 378.061 82.889 3.983 100 98
S824_6 DI303 0.9836 378.061 113.33 3.983 100 98
S824_7 DI292 0.1602 378.064 18.458 3.983 100 98
S824_8 DI317 0.9126 378.062 105.149 3.983 100 98
S824_9 DI279 2.0547 378.06 236.742 3.983 46 88.225
S832_3 DI061 2.7619 461.909 260.459 3.956 28 81.64
S838_1 DI357 1.9944 379.594 228.866 5.324 34 85.46
S838_3 DI356 0.2684 379.594 30.8 5.324 100 98
S838_4 DI358 1.9088 379.594 219.043 5.324 44 83.511
S853_2 DI352 1.3046 190.018 299.068 4.529 82 93.143
S853_3 DI355 0.2502 190.019 57.356 4.529 100 98
S853_4 DI354 1.6898 190.018 387.372 4.529 87 94.693
S856_1 DI345 0.2469 402.205 26.74 6.204 100 98
S856_10 DI339 0.8451 402.209 91.526 6.204 94 96.558
S856_11 DI341 0.6823 402.206 73.895 6.204 35 82.97
S856_12 DI340 0.3646 402.208 39.487 6.204 52 86.75
S856_13 DI348 0.4612 402.208 49.949 6.204 71 91.04
S856_2 DI329 0.7456 402.208 80.75 6.204 67 90.08
S856_3 DI346 0.2308 402.21 24.996 6.204 100 98
S856_4 DI347 0.0633 402.18 6.856 6.204 50 86
S856_5 DI342 0.1074 402.196 11.632 6.204 100 98
S856_6 DI338 1.7024 402.207 184.374 6.204 72 93.698
S856_8 DI349 0.1614 402.207 17.48 6.204 100 98
S856_9 DI343 1.3759 402.208 149.013 6.204 51 86.48
S864_1 DI321 0.2069 351.381 25.649 3.824 100 98
S864_10 DI326 0.4762 351.384 59.033 3.824 100 98
S864_11 DI494 0.6229 291.098 93.211 3.824 100 98
12588710 | Crescent City Storm Drain Master Plan 11
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S864_12 DI332 0.5224 351.38 64.761 3.824 100 98
S864_13 J16 0.1289 60.238 93.212 3.824 100 98
S864_2 DI535 0.5059 351.383 62.715 3.824 95 96.8
S864_3 DI495 0.2207 351.378 27.36 3.824 92 96.08
S864_4 DI324 0.9958 351.382 123.447 3.824 100 98
S864_5 J9 0.6557 140.902 202.71 3.824 95 96.95
S864_6 DI323 0.1112 351.387 13.785 3.824 100 98
S864_7 DI315 0.534 351.381 66.199 3.824 100 98
S864_8 DI331 0.9795 210.482 202.711 3.824 95 96.95
S864_9 DI325 0.3999 351.38 49.575 3.824 100 98
S868 DI110 0.5761 479.579 52.327 5.9 89 94.975
S868_10 DI111 0.7281 479.572 66.134 5.9 100 98
S868_2 DI114 0.3976 479.577 36.114 5.9 100 98
S868_4 DI115 0.0637 479.567 5.786 5.9 100 98
S868_5 DI112 0.1405 479.563 12.762 5.9 100 98
S868_6 DI117 0.1249 479.563 11.345 5.9 100 98
S868_8 DI113 0.2034 479.573 18.475 5.9 100 98
S869 DI318 0.4382 365.593 52.211 4.581 100 98
S869_3 DI327 0.7028 365.592 83.738 4.581 77 92.48
S869_4 DI320 2.0024 365.594 238.583 4.581 92 96.08
S872_4 DI077 0.8335 561.649 64.644 5.133 55 85.399
S880_1 J36 1.7899 356.184 218.898 3.779 83 94.07
S880_2 DI314 0.1928 356.18 23.579 3.779 91 95.84
S880_3 DI538 0.4886 356.184 59.754 3.779 91 95.84
S880_4 J33 2.128 356.185 260.246 3.779 97 97.28
S880_8 DI311 1.315 356.186 160.819 3.779 79 92.96
S886_3 DI121 3.5221 310.811 493.62 2.929 59 83.71
S890 DI336 0.4765 545.616 38.042 3.814 10 50.212
S890_1 J46 0.201 142.761 61.33 3.814 82 89.29
S890_2 DI334 2.4155 545.618 192.844 3.814 0 73.255
S890_3 DI337 0.5672 402.857 61.33 3.814 82 89.29
S890_4 J44 0.2306 545.624 18.41 3.814 100 98
S890_5 DI073 1.4347 545.617 114.541 3.814 40 83.587
S890_7 DI073 0.3101 545.622 24.757 3.814 100 98
S890_9 J45 0.1587 545.617 12.67 3.814 50 86
S892_1 DI364 2.0336 424.558 208.649 5.411 55 86.021
S892_2 DI028 0.7737 424.559 79.382 5.411 43 83.304
12588710 | Crescent City Storm Drain Master Plan 12
Name Outlet Area (ac) Width (ft)
Flow
Length
(ft) Slope (%)
Imperv.
(%)
Curve
Number
S892_4 DI490 0.3192 424.56 32.75 5.411 70 89.75
S892_6 DI027 1.0503 424.561 107.761 5.411 60 87.832
S892_7 DI026 0.8165 424.561 83.773 5.411 38 83.148
S893 DI076 0.1604 404.459 17.275 6.091 100 98
S893_1 DI015 1.9871 404.469 214.004 6.091 61 87.428
S893_3 DI013 2.0627 404.469 222.146 6.091 67 90.08
S893_4 DI094 1.1656 404.47 125.531 6.091 53 86.72
S893_5 DI080 1.2799 404.469 137.841 6.091 60 88.4
S893_6 DI012 1.0968 404.468 118.122 6.091 65 89.56
S893_7 DI011 0.9321 404.47 100.384 6.091 85 94.4
S9 DI175 6.9755 321.846 944.094 4.201 32 83.052
S908_1 DI006 1.6164 379.923 185.328 8.226 52 86.48
S927_2 DI005 1.3621 229.55 258.476 4.748 35 81.305
S995 DI049 1.5188 499.999 132.318 0.5 67 90.08
S995_3 DI048 1.5715 500 136.909 0.5 73 91.62
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 136 Attachment 4
SCS Curve Numbers
The Power of Commitment
12588710 | Crescent City Storm Drain Master Plan 1
Figure 1 Soils Data Boundary
12588710 | Crescent City Storm Drain Master Plan 2
SCS curve numbers
Hydrologic Soil Group1
Land Use Description A B C D
Cultivated land
Without conservation treatment 72 81 88 91
With conservation treatment 62 71 78 81
Pasture or range land
Poor condition 68 79 86 89
Good condition 39 61 74 80
Meadow
Good condition 30 58 71 78
Wood or forest land
Thin stand, poor cover, no mulch 45 66 77 83
Good cover² 25 55 70 77
Open spaces, lawns, parks, golf courses, cemeteries, etc.
Good condition: grass cover on 75% or more of the
area
39 61 74 80
Fair condition: grass cover on 50 - 75% of the area 49 69 79 84 Commercial and business areas (85% impervious) 89 92 94 95 Industrial districts (72% impervious) 81 88 91 93
Residential³ Average lot size (% Impervious₄)
1/8 ac or less (65) 77 85 90 92
1/4 ac (38) 61 75 83 87
1/3 ac (30) 57 72 81 86
1/2 ac (25) 54 70 80 85
1 ac (20) 51 68 79 84
Paved parking lots, roofs, driveways, etc.₅ 98 98 98 98 Streets and roads
Paved with curbs and storm sewers₅ 98 98 98 98
Gravel 76 85 89 91
Dirt 72 82 87 89
1. Antecedent moisture condition II; Source: SCS Urban Hydrology for Small Watersheds, 2nd Ed., (TR-55), June 1986.
2. Good cover is protected from grazing and litter and brush cover soil.
3. Curve numbers are computed assuming that the runoff from the house and driveway is directed toward the street with a minimum of roof water directed to lawns where additional infiltration could occur.
4. The remaining pervious areas (lawn) are considered to be in good pasture condition for these curve numbers.
5. In some warmer climates of the country a curve number of 95 may be used.
Disclaimer
The values listed here were transcribed from the original reference(s) cited; CHI does not guarantee their accuracy, completeness or suitability for any purpose. The reader should read the source document(s) to understand the limitations and appropriateness of the information.
The modeler is obligated to verify the applicability of these and all attributes/parameters used in their models. Professional engineering judgement must be used throughout the modeling exercise.
12588710 | Crescent City Storm Drain Master Plan 3
Land Use Description A B C D
1 ac (20) 51 68 79 84
1/2 ac (25) 54 70 80 85
1/3 ac (30) 57 72 81 86
1/4 ac (38) 61 75 83 87
1/8 ac or less (65) 77 85 90 92
Commercial and business areas (85% impervious) 89 92 94 95 Dirt 72 82 87 89
Fair condition: grass cover on 50 - 75% of the area 49 69 79 84 Good condition 39 61 74 80
Good condition 30 58 71 78
Good condition: grass cover on 75% or more of the area 39 61 74 80 Good cover² 25 55 70 77
Gravel 76 85 89 91
Industrial districts (72% impervious) 81 88 91 93
Paved parking lots, roofs, driveways, etc.₅ 98 98 98 98 Paved with curbs and storm sewers₅ 98 98 98 98
Poor condition 68 79 86 89
Thin stand, poor cover, no mulch 45 66 77 83
With conservation treatment 62 71 78 81
Without conservation treatment 72 81 88 91
12588710 | Crescent City Storm Drain Master Plan 4
NRCS hydrologic soil group definitions
Group Meaning
Saturated
Hydraulic
Conductivity
(in/hr)
Saturated
Hydraulic
Conductivity
(mm/hr)
A
Low runoff potential. Soils having high
infiltration rates even when thoroughly
wetted and consisting chiefly of deep, well
to excessively drained sands or gravels.
≥ 0.45 ≥ 11.43
B
Soils having moderate infiltration rates
when thoroughly wetted and consisting
chiefly of moderately deep to deep,
moderately well to well-drained soils with
moderately fine to moderately coarse
textures. E.g., shallow loess, sandy loam.
0.30 - 0.15 7.62-3.81
C
Soils having slow infiltration rates when
thoroughly wetted and consisting chiefly of
soils with a layer that impedes downward
movement of water, or soils with
moderately fine to fine textures. E.g., clay
loams, shallow sandy loam.
0.15 - 0.05 3.81-1.27
D
High runoff potential. Soils having very
slow infiltration rates when thoroughly
wetted and consisting chiefly of clay soils
with a high swelling potential, soils with a
permanent high water table, soils with a
clay-pan or clay layer at or near the
surface, and shallow soils over nearly
impervious material.
0.05 - 0.00 1.27-0.00
Source: Hydrology National Engineering Handbook, Chapter 7, Natural Resources Conservation Service, U.S. Department of Agriculture, January 2009.
Disclaimer
The values listed here were transcribed from the original reference(s) cited; CHI does not guarantee their accuracy, completeness or suitability for any purpose. The reader should read the source document(s) to understand the limitations and appropriateness of the information. The modeler is obligated to verify the applicability of these and all attributes/parameters used in their models. Professional engineering judgement must be used throughout the modeling exercise.
GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 137 Attachment 5
Base Condition Model Data
Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C534_1 Overland I536 DI537 560.294 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 2.31% Ehoover 0.35 0.35 0.32C534_2 Overland DI537 I115 175.039 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 0.00% Ehoover 0.35 0.35 0.32C536 Overland I114 I113 226.487 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 0.37% Ehoover2 0.35 0.35 0.32C33 Overland I009 I060 665.603 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 -0.35% ElkCreek 0.25 0.25 0.2C50 Overland I189 I009 1287.5 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 0.34% ElkCreek 0.25 0.25 0.2C54 Overland I707 SP7 40.038 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 0.45% S101-c54 0.15 0.15 0.15C55 Overland SP7 I049 190.502 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 3.04% S101-c55 0.15 0.15 0.15C11 Overland I185 I183 1956.473 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 -0.26% T-C11 0.4 0.4 0.6C29 Overland I183 I095 55.109 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 3.63% T-C11 0.4 0.4 0.6C15 Overland I101 DI183 1358.822 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 1.20% T-C15 0.15 0.15 0.15C17 Street DI514 DI199 59.924 0.017 0 0 0.1 0.1 IRREGULAR 0 0 1 -0.35% T-C1-7Wilson-rd 0.011 0.011 0.011C19 Overland I002 I087 458.282 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 0.22% T-C19-2 0.4 0.4 0.6C614 Overland I029 I190 69.259 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 -1.44% T-C20 0.13 0.13 0.13C615 Overland I030 I190 72.374 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 -1.38% T-C20 0.13 0.13 0.13C20 Overland I190 OF4 107.936 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 0.37% T-C20-2 0.13 0.13 0.13C33_1 Overland DI512 I188 84.016 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 0.00% T-C33_1 0.35 0.35 0.32C33_4 Overland SP1 I092 197.746 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 0.00% T-C33_2 0.35 0.35 0.32C33_5 Overland I188 SP1 225.722 0.06 0 0 0 0.1 IRREGULAR 0 0 1 0.00% T-C33_2 0.35 0.35 0.32C37 Overland I186 DI515 461.409 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 -0.98% T-C37 0.4 0.4 0.6C56 Overland I186 I070 450.069 0.06 0 0 0 0 IRREGULAR 0 0 1 -1.11% T-C37 0.4 0.4 0.6C9 Overland I086 I186 215.742 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 3.30% T-C37 0.4 0.4 0.6C3 Overland I123 DI537 275.57 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 -0.36% T-C3swale 0.05 0.04 0.05C5_1 Overland I103 OF1 344.337 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 1.10% T-C5_1 0.4 0.4 0.6C507 Overland I102 I103 31.137 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 29.27% T-C507 0.04 0.04 0.06C6 Overland I063 I009 389.49 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 1.26% T-C6 0.04 0.04 0.06C6_2 Overland I057 I009 350.038 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 0.82% T-C6_2 0.04 0.04 0.06C624 Overland I112 CreekStorage 159.206 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 8.58% T-C624 0.04 0.04 0.06C622 Overland I116 CreekStorage 881.373 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 2.40% T-C626 0.04 0.04 0.06C626 Overland CreekStorage I110 820.339 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 0.00% T-C626 0.04 0.04 0.06C627 Overland I110 I185 472.66 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 1.66% T-C627 0.04 0.04 0.06C707_1 Overland I105 I185 187.228 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 4.69% T-C707_1 0.04 0.04 0.06C9_1 Overland I087 I186 310.92 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 1.33% T-C9_1 0.04 0.04 0.06C5 Overland I049 OF3 72.879 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 2.20% Transect1 0.04 0.04 0.06C51 Overland I191 OF9 68.176 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 22.21% Transect4 0.04 0.04 0.06C52 Overland I192 OF5 24.053 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 16.87% Transect5 0.04 0.04 0.06C53 Overland I193 OF2 87.235 0.06 0 0 0.1 0.1 IRREGULAR 0 0 1 0.57% Transect6 0.04 0.04 0.06C001 Closed-Conduit DI018 I038 74.026 0.012 1.7 0 0.1 0.1 CIRCULAR 1 0 1 5.21%C002 Closed-Conduit DI019 MH015 85.566 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.10%C003 Closed-Conduit DI038 DI039 205.587 0.014 0 0 0.1 0.1 CIRCULAR 3 0 1 0.04%C004 Closed-Conduit I010 DI038 23.358 0.014 0 0 0.1 0.1 CIRCULAR 3 0 1 0.01%C005 Closed-Conduit DI037 I010 19 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.11%C006 Closed-Conduit DI034 DI035 39.953 0.014 1 0 0.1 0.1 CIRCULAR 2 0 1 0.71%C007 Closed-Conduit DI035 DI037 207.844 0.014 0.6 0 0.1 0.1 CIRCULAR 2 0 1 0.86%C009 Closed-Conduit DI033 DI034 219.879 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.05%C011 Closed-Conduit DI032 MH070 391.139 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.04%C014 Closed-Conduit I021 DI032 361.201 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 0.16%C015 Closed-Conduit DI060 I021 318.661 0.014 0.5 0 0.1 0.1 CIRCULAR 2 0 1 0.56%C016 Closed-Conduit I020 DI060 115.488 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 0.34%C017 Closed-Conduit DI058 I019 12.38 0.014 3.1 0 0.1 0.1 CIRCULAR 1 0 1 31.92%C018 Closed-Conduit I019 I020 195.576 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 0.36%C019 Closed-Conduit DI059 I020 5.957 0.014 2.1 2.1 0.1 0.1 CIRCULAR 2 0 1 -0.07%C020 Closed-Conduit DI057 I019 265.46 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 0.66%C021 Closed-Conduit DI043 I011 37.922 0.014 0.65 0.2 0.1 0.1 CIRCULAR 1.5 0 1 0.69%C022 Closed-Conduit DI044 I012 33.244 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 1.29%C023 Closed-Conduit I011 I012 37.222 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.19%C024_1 Closed-Conduit DI008 I003 134.896 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.07%C024_2 Closed-Conduit I003 DI019 25.508 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.26%C025 Closed-Conduit I012 I013 219.981 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 2.89%C026 Closed-Conduit DI047 I015 187.338 0.014 2.5 0 0.1 0.1 CIRCULAR 1 0 1 2.98%C027 Closed-Conduit DI046 I015 31.947 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 3.29%C028 Closed-Conduit DI045 I014 35.751 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 6.95% 1 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C029 Closed-Conduit I015 I014 37.019 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.93%C030_1 Closed-Conduit I014 I022 195.726 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.06%C030_2 Closed-Conduit I022 I013 46.968 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.22%C031 Closed-Conduit I013 I010 953.261 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.22%C032 Closed-Conduit DI048 DI049 38.189 0.014 0.3 0.88 0.1 0.1 CIRCULAR 0.67 0 1 1.81%C033 Closed-Conduit DI049 DI051 211.228 0.022 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.04%C034 Closed-Conduit DI051 I016 42.251 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 3.95%C035 Closed-Conduit DI010 DI008 54.852 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.04%C036 Closed-Conduit DI052 I016 298.02 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.40%C037 Closed-Conduit DI053 I017 24.445 0.014 0.75 0.4 0.1 0.1 CIRCULAR 1.5 0 1 5.49%C038 Closed-Conduit I017 DI052 46.019 0.014 0.6 0.4 0.1 0.1 CIRCULAR 1.5 0 1 0.65%C039_1 Closed-Conduit I016 MH069 419.999 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.17%C039_2 Closed-Conduit MH069 I013 42.28 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.82%C040 Closed-Conduit DI054 I018 51.383 0.014 2.2 0.1 0.1 0.1 CIRCULAR 1 0 1 0.66%C041 Closed-Conduit I018 I017 742.775 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.04%C042 Closed-Conduit DI056 DI055 39.723 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.51%C043 Closed-Conduit DI251 I170 324.893 0.014 1 0 0.1 0.1 CIRCULAR 1 0 1 0.41%C044 Closed-Conduit DI363 I170 54.998 0.012 0.6 0 0.1 0.1 CIRCULAR 1.5 0 1 0.13%C045 Closed-Conduit DI061 I021 18.609 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.24%C046 Closed-Conduit I170 DI491 155.538 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.09%C048 Closed-Conduit DI009 DI008 69.7 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 0.46%C049 Closed-Conduit DI361 DI492 3.266 0.012 0.7 0 0.1 0.1 CIRCULAR 1.5 0 1 4.11%C050 Closed-Conduit DI491 DI492 13.522 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.85%C051_1 Closed-Conduit DI492 DI362 184.59 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.12%C051_2 Closed-Conduit DI362 DI359 399.051 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.43%C052 Closed-Conduit DI360 DI359 39.487 0.014 0 1.2 0.1 0.1 CIRCULAR 1 0 1 3.34%C053 Closed-Conduit DI359 I168 339.231 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.19%C054 Closed-Conduit DI353 I168 82.895 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.77%C055 Closed-Conduit I168 I163 71.998 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.69%C056 Closed-Conduit DI344 I163 6.906 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 7.46%C057 Closed-Conduit I163 I160 182.334 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.27%C059 Closed-Conduit DI333 I160 9.642 0.014 1.8 0 0.1 0.1 CIRCULAR 1 0 1 31.82%C060 Closed-Conduit DI322 I151 32.065 0.014 1.8 0 0.1 0.1 CIRCULAR 1 0 1 9.51%C063 Closed-Conduit DI312 DI306 10.754 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 12.66%C065 Closed-Conduit DI295 DI281 174.621 0.012 0 0 0.1 0.1 CIRCULAR 1 0 1 2.12%C066 Closed-Conduit I143 I120 286.311 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.72%C067 Closed-Conduit DI288 DI281 39.056 0.012 0 0.8 0.1 0.1 CIRCULAR 1.3 0 1 2.28%C068 Closed-Conduit DI281 DI250 61.675 0.012 3.2 0.33 0.1 0.1 CIRCULAR 1 0 1 3.44%C069 Closed-Conduit I104 DI009 279.165 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 2.01%C070 Closed-Conduit DI250 I120 47.65 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.13%C071 Closed-Conduit DI248 I120 17.082 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.93%C072 Closed-Conduit DI272 DI264 39.254 0.012 0.1 0 0.1 0.1 CIRCULAR 1 0 1 0.08%C073 Closed-Conduit I127 DI248 250.8 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.73%C074 Closed-Conduit DI264 I127 29.958 0.012 2.3 0.1 0.1 0.1 CIRCULAR 1 0 1 9.92%C075 Closed-Conduit I120 MH010 295.769 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.41%C076 Closed-Conduit DI233 MH010 13.597 0.014 1.6 0 0.1 0.1 CIRCULAR 0.5 0 1 19.27%C077 Closed-Conduit DI209 DI218 39.524 0.014 0.4 0 0.1 0.1 CIRCULAR 1 0 1 0.34%C078 Closed-Conduit DI218 DI227 113.102 0.014 1.3 0 0.1 0.1 CIRCULAR 1 0 1 2.07%C079 Closed-Conduit DI227 MH010 49.277 0.014 2.5 0.2 0.1 0.1 CIRCULAR 1 0 1 2.85%C080 Closed-Conduit DI011 I104 15.71 0.014 1 0 0.1 0.1 CIRCULAR 0.67 0 1 10.58%C081 Closed-Conduit DI255 I125 18.013 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.43%C082 Closed-Conduit I125 I126 290.419 0.012 0 1 0.1 0.1 CIRCULAR 1.25 0 1 1.27%C083 Closed-Conduit DI256 I126 19.254 0.013 0.9 0 0.1 0.1 CIRCULAR 1.25 0 1 11.65%C084 Closed-Conduit DI257 I128 16.334 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 16.87%C085 Closed-Conduit I126 I128 33.836 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.51%C086 Closed-Conduit I128 DI258 12.601 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 3.48%C087 Closed-Conduit DI258 DI259 135.205 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 5.14%C088 Closed-Conduit DI254 I124 120.866 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 4.51%C089 Closed-Conduit DI252 DI253 69.78 0.012 1.1 0 0.1 0.1 CIRCULAR 1.33 0 1 1.47%C090 Closed-Conduit DI253 I124 72.312 0.012 3.1 0.25 0.1 0.1 CIRCULAR 1.5 0 1 7.49%C091 Closed-Conduit I134 I104 11.346 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 3.20% 2 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C092 Closed-Conduit I124 DI259 293.727 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 2.17%C093 Closed-Conduit DI259 DI260 39.707 0.014 5.9 0 0.1 0.1 CIRCULAR 1.5 0 1 0.99%C094 Closed-Conduit DI260 I129 253.797 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.98%C095 Closed-Conduit DI262 I129 169.226 0.014 0 0.75 0.1 0.1 CIRCULAR 1 0 1 1.94%C096 Closed-Conduit DI261 DI263 44.846 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.56%C097 Closed-Conduit I129 DI261 6.328 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.58%C098 Closed-Conduit DI263 DI265 65.031 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 7.83%C099 Closed-Conduit DI265 I130 197.19 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.53%C1 Street DI347 DI340 210.389 0.017 0.8 1.5 0.1 0.1 STREET 0 0 1 3.09% JStreetC10 Closed-Conduit DI531 I013 20.512 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 25.07%C100 Closed-Conduit DI266 DI267 70.734 0.012 0 0.35 0.1 0.1 CIRCULAR 1.4 0 1 3.12%C101 Closed-Conduit DI267 I130 116.97 0.011 0 1.6 0.1 0.1 CIRCULAR 1 0 1 5.45%C102 Closed-Conduit DI006 I134 37.199 0.013 0.7 0 0.1 0.1 CIRCULAR 1.5 0 1 3.06%C103 Closed-Conduit I130 DI268 49.895 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 4.71%C104 Closed-Conduit J50 DI063 301.817 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.66%C104_1 Closed-Conduit DI268 MH042 37.117 0.013 2.6 0 0.1 0.1 CIRCULAR 2 0 1 2.32%C104_2 Closed-Conduit MH042 DI269 12.435 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 0.54%C105 Closed-Conduit DI488 I131 26.276 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 5.98%C106 Closed-Conduit I131 DI269 100.687 0.012 0 0 0.1 0.1 CIRCULAR 1 0 1 3.95%C107 Closed-Conduit DI270 DI269 14.834 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 19.96%C108 Closed-Conduit DI271 DI273 193.304 0.014 0 0 0.1 0.1 CIRCULAR 2.67 0 1 -1.41%C109 Closed-Conduit DI269 DI271 89.421 0.012 0 0 0.1 0.1 CIRCULAR 2 0 1 3.34%C110 Closed-Conduit DI275 DI273 40.354 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.17%C111 Closed-Conduit DI276 DI275 7.394 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.88%C112 Closed-Conduit DI293 DI276 198.801 0.012 0 0 0.1 0.1 CIRCULAR 0.8 0 1 5.65%C113 Closed-Conduit MH014 MH013 6.053 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 1.31%C114 Closed-Conduit I169 I134 310.519 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.33%C115 Closed-Conduit DI273 DI274 58.112 0.014 0 0 0.1 0.1 FILLED_CIRCULAR 2 1.9 1 1.82%C116 Closed-Conduit DI274 DI277 38.947 0.013 0 1 0.1 0.1 FILLED_CIRCULAR 2 1.9 1 1.75%C117 Closed-Conduit DI279 I132 11.929 0.014 2.5 0 0.1 0.1 CIRCULAR 1.5 0 1 28.30%C118 Closed-Conduit DI280 I133 5.473 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 40.08%C119 Closed-Conduit I132 I133 38.596 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 1.30%C12 Closed-Conduit DI525 DI010 77.823 0.013 2.2 0 0.1 0.1 CIRCULAR 1 0 1 0.31%C120 Closed-Conduit I133 DI277 250.235 0.011 0 1 0.1 0.1 CIRCULAR 1.5 0 1 2.39%C121 Closed-Conduit J54 J53 3.439 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 2.65%C121_1 Closed-Conduit DI277 DI508 42.748 0.013 1 0 0.1 0.1 CIRCULAR 2 0 1 0.41%C121_2 Closed-Conduit DI508 DI284 226.99 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.57%C122 Closed-Conduit DI284 I136 30.277 0.014 0.67 0 0.1 0.1 CIRCULAR 2 0 1 3.21%C123 Closed-Conduit DI292 I139 9.304 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 4.41%C124 Closed-Conduit I139 DI291 16.581 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.05%C125 Closed-Conduit DI012 I169 6.829 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 72.02%C126 Closed-Conduit DI291 DI290 45.657 0.014 0 0.1 0.1 0.1 FILLED_CIRCULAR 1 0.4 1 1.38%C127 Closed-Conduit DI290 DI289 85.124 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.38%C128 Closed-Conduit DI289 I137 114.908 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 1.54%C129 Closed-Conduit DI286 I137 17.69 0.014 0.8 0.8 0.1 0.1 CIRCULAR 1 0 1 3.16%C13 Closed-Conduit DI524 I003 40.699 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.74%C130 Closed-Conduit DI496 I138 19.89 0.013 0 0 0.1 0.1 CIRCULAR 0.83 0 1 2.89%C131 Closed-Conduit I138 MH034 134.952 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.14%C132 Closed-Conduit I137 MH034 21.737 0.014 0.8 0 0.1 0.1 CIRCULAR 1 0 1 7.33%C133 Closed-Conduit DI287 MH034 26.165 0.014 1 0 0.1 0.1 CIRCULAR 1 0 1 4.91%C134 Closed-Conduit J56 J55 12.95 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 -15.31%C134_1 Closed-Conduit MH034 J23 126.255 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 4.07%C134_2 Closed-Conduit J23 I136 75.718 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 4.07%C134_3 Closed-Conduit J31 J55 58.201 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 1.02%C134_4 Closed-Conduit J58 J59 86.541 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 1.02%C134_5 Closed-Conduit J55 J58 212.475 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 1.02%C134_7 Closed-Conduit J59 J68 263.752 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 1.07%C135 Closed-Conduit I136 DI285 8.47 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 3.15%C136 Closed-Conduit DI013 I169 38.49 0.014 4 0 0.1 0.1 CIRCULAR 2 0 1 13.33%C137 Closed-Conduit DI285 SP4 133.849 0.014 0 0 0.1 0.1 CIRCULAR 2.5 0 1 -0.20%C138 Closed-Conduit J57 J58 8.938 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 -19.98% 3 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C139 Closed-Conduit SP4 DI302 150.625 0.013 0 0 0.1 0.1 CIRCULAR 2.5 0 1 -0.76%C14 Closed-Conduit DI516 I100 157.505 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.40%C140 Closed-Conduit DI303 DI302 300.6 0.014 0 1.75 0.1 0.1 CIRCULAR 1 0 1 0.62%C141 Closed-Conduit J60 J59 8.267 0.012 0 0 0.1 0.1 CIRCULAR 2 0 1 -17.11%C142 Closed-Conduit DI278 I135 40.96 0.014 1.7 0 0.1 0.1 CIRCULAR 2 0 1 2.21%C143 Closed-Conduit I135 DI282 117.011 0.013 0 0 0.1 0.1 FILLED_CIRCULAR 2 1.9 1 0.17%C144 Closed-Conduit DI283 J6 22.718 0.014 0.75 0 0.1 0.1 CIRCULAR 1.5 0 1 18.35%C145 Closed-Conduit J63 J64 27.897 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 5.14%C145_1 Closed-Conduit DI282 MH067 150.263 0.013 0 0 0.1 0.1 FILLED_CIRCULAR 2.5 1.9 1 0.20%C145_2 Closed-Conduit MH067 DI302 281.936 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.12%C146 Closed-Conduit J68 DI036 10.618 0.012 0 0 0.1 0.1 CIRCULAR 4 0 1 -0.94%C147 Closed-Conduit DI014 I169 290.843 0.014 4.9 0 0.1 0.1 CIRCULAR 2 0 1 3.73%C148 Closed-Conduit J40 J69 9.067 0.012 0 0 0.1 0.1 CIRCULAR 4.5 0 1 0.00%C149 Closed-Conduit DI300 MH032 24.13 0.012 0.75 0.05 0.1 0.1 CIRCULAR 1.4 0 1 7.20%C151 Closed-Conduit MH032 I142 47.14 0.012 2 0 0.1 0.1 CIRCULAR 3 0 1 3.23%C152 Closed-Conduit DI299 I142 67.615 0.014 1.1 0 0.1 0.1 CIRCULAR 1 0 1 3.44%C153 Closed-Conduit DI297 MH032 44.732 0.014 1.45 0.1 0.1 0.1 CIRCULAR 1 0 1 7.38%C154 Closed-Conduit DI298 MH033 35.832 0.012 0 0 0.1 0.1 CIRCULAR 1 0 1 0.53%C155_1 Closed-Conduit MH033 J32 13.686 0.012 0.25 0 0.1 0.1 CIRCULAR 3 0 1 1.30%C155_2 Closed-Conduit J32 MH011 255.051 0.012 0 0 0.1 0.1 CIRCULAR 3 0 1 1.30%C156_1 Closed-Conduit MH011 MH068 9.423 0.013 0.5 0.2 0.1 0.1 CIRCULAR 3 0 1 1.20%C156_2 Closed-Conduit MH068 MH012 15.065 0.014 0.4 0.1 0.1 0.1 CIRCULAR 3 0 1 0.08%C157 Closed-Conduit I142 I140 288.059 0.012 0 0 0.1 0.1 CIRCULAR 3 0 1 0.83%C158 Closed-Conduit DI296 I141 30.145 0.022 2.55 0 0.1 0.1 CIRCULAR 1.25 0 1 15.80%C159 Closed-Conduit DI015 DI014 75.418 0.014 2.05 4.65 0.1 0.1 CIRCULAR 0.75 0 1 2.68%C16 Street DI195 DI193 525.863 0.017 2.8 4.6 0.1 0.1 STREET 0 0 1 0.11% 101SC160 Closed-Conduit DI294 MH012 43.679 0.014 0 0 0.1 0.1 CIRCULAR 3 0 1 5.40%C161 Closed-Conduit MH012 I140 13.058 0.014 0 0 0.1 0.1 CIRCULAR 3 0 1 0.23%C162 Closed-Conduit I140 I141 14.716 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 1.36%C163 Closed-Conduit MH030 I141 282.987 0.012 0 0 0.1 0.1 CIRCULAR 3 0 1 -0.02%C164 Closed-Conduit DI305 MH031 57.999 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 3.39%C165 Closed-Conduit DI307 MH031 35.845 0.014 0.2 0 0.1 0.1 CIRCULAR 1 0 1 3.44%C166 Closed-Conduit MH031 I144 60.524 0.014 1.75 0.5 0.1 0.1 CIRCULAR 1.25 0 1 2.09%C167 Closed-Conduit DI308 I144 42.99 0.014 1.1 0 0.1 0.1 CIRCULAR 1 0 1 6.38%C168_2 Closed-Conduit DI527 MH030 51.038 0.012 0 3 0.1 0.1 CIRCULAR 2 0 1 1.73%C168_3 Closed-Conduit I144 I033 118.703 0.012 0 0 0.1 0.1 CIRCULAR 2 0 1 0.18%C168_4 Closed-Conduit I033 DI527 57.694 0.012 0 0 0.1 0.1 CIRCULAR 2 0 1 0.09%C170 Closed-Conduit DI017 DI014 302.476 0.014 0 0.4 0.1 0.1 CIRCULAR 2 0 1 1.90%C172 Closed-Conduit DI310 MH028 45.202 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 8.87%C174_1 Closed-Conduit DI528 MH012 16.738 0.013 1.5 0.5 0.1 0.1 CIRCULAR 1.5 0 1 22.15%C174_2 Closed-Conduit MH004 DI528 45.184 0.013 1.5 1.2 0.1 0.1 CIRCULAR 1.5 0 1 0.24%C175 Closed-Conduit MH004 MH005 5.163 0.014 0 0 0.1 0.1 CIRCULAR 4 0 1 60.02%C176 Closed-Conduit DI071 I026 18.075 0.014 0.95 1.95 0.1 0.1 CIRCULAR 1.25 0 1 2.98%C177 Closed-Conduit MH005 I026 133.866 0.014 1.7 0 0.1 0.1 CIRCULAR 4 0 1 0.67%C178 Closed-Conduit DI069 MH005 311.654 0.014 0 0 0.1 0.1 CIRCULAR 4 0 1 0.25%C179 Closed-Conduit MH003 DI069 282.164 0.014 2.75 0 0.1 0.1 FILLED_CIRCULAR 3 2.75 1 0.17%C18 Closed-Conduit I060 I049 547.498 0.014 0 0 0.1 0.1 RECT_CLOSED 6 12 1 0.98%C180 Closed-Conduit DI068 MH003 5.85 0.014 0.15 0 0.1 0.1 FILLED_CIRCULAR 1.25 1.15 1 92.40%C181 Closed-Conduit DI016 DI017 119.273 0.014 0 0.2 0.1 0.1 CIRCULAR 1.25 0 1 2.66%C183_1 Closed-Conduit MH004 MH065 312.128 0.014 1 0 0.1 0.1 CIRCULAR 1.5 0 1 0.56%C183_2 Closed-Conduit MH065 MH009 30.023 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.36%C184_1 Closed-Conduit MH009 I997 246.497 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.04%C184_2 Closed-Conduit I997 MH003 3.762 0.013 0 2 0.1 0.1 FILLED_CIRCULAR 1.5 1.25 1 33.91%C185 Closed-Conduit DI067 I997 3.671 0.013 0 0 0.1 0.1 FILLED_CIRCULAR 1.5 1.25 1 19.60%C186_1 Closed-Conduit DI066 J1 27.392 0.012 1.18 0 0.1 0.1 CIRCULAR 1.5 0 1 1.37%C186_3 Closed-Conduit J1 J65 18.219 0.012 0 0 0.1 0.1 CIRCULAR 1.5 0 1 1.37%C186_4 Closed-Conduit J65 DI067 47.309 0.012 0 0 0.1 0.1 CIRCULAR 1.5 0 1 1.37%C187 Closed-Conduit DI065 DI066 40.055 0.012 0 0.3 0.1 0.1 CIRCULAR 1 0 1 2.18%C188 Closed-Conduit I023 DI066 228.918 0.014 0 0 0.1 0.1 CIRCULAR 1.25 0 1 1.36%C189 Closed-Conduit DI064 I023 39.332 0.014 1.65 0 0.1 0.1 CIRCULAR 1 0 1 5.82%C190 Closed-Conduit DI062 DI063 56.961 0.014 0 0.9 0.1 0.1 CIRCULAR 1 0 1 0.13% 4 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C191 Closed-Conduit DI063 I023 57.065 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 0.35%C193 Closed-Conduit I175 DI016 282.491 0.014 0 0 0.1 0.1 CIRCULAR 1.25 0 1 1.24%C194 Closed-Conduit DI334 DI335 39.723 0.012 0.4 0 0.1 0.1 CIRCULAR 1.5 0 1 1.78%C195 Closed-Conduit DI336 DI337 78.541 0.014 0.6 0 0.1 0.1 CIRCULAR 2 0 1 0.36%C196 Closed-Conduit DI335 DI336 103.989 0.014 0 0.2 0.1 0.1 CIRCULAR 1.75 0 1 0.12%C197 Closed-Conduit DI337 OF10 72.352 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 8.88%C199 Closed-Conduit DI311 DI310 41.71 0.012 1.25 0 0.1 0.1 CIRCULAR 2 0 1 3.06%C2 Street DI348 DI343 254.079 0.017 0.9 13.3 0.1 0.1 STREET 0 0 1 -1.91% JStreetC200_1 Closed-Conduit DI538 MH040 61.632 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 2.68%C200_2 Closed-Conduit MH040 I147 38.704 0.014 0 0 0.1 0.1 CIRCULAR 1.25 0 1 1.73%C201 Closed-Conduit DI314 I147 9.173 0.014 1 0 0.1 0.1 CIRCULAR 1 0 1 4.76%C202 Closed-Conduit I147 I146 39.837 0.014 0 0 0.1 0.1 CIRCULAR 1.25 0 1 0.03%C203 Closed-Conduit DI313 I146 6.707 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 9.09%C204 Closed-Conduit DI367 I175 315.384 0.013 0 0.75 0.1 0.1 CIRCULAR 1.25 0 1 1.12%C205_1 Closed-Conduit MH027 MH041 208.223 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.25%C205_2 Closed-Conduit MH041 MH028 99.489 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 6.94%C206 Closed-Conduit DI535 MH027 177.123 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 0.17%C207 Closed-Conduit I146 MH027 35.402 0.013 0 0 0.1 0.1 CIRCULAR 1.25 0 1 0.40%C208 Closed-Conduit DI081 MH055 26.002 0.014 1.6 0 0.1 0.1 CIRCULAR 1 0 1 19.54%C209 Closed-Conduit MH055 MH057 125.219 0.014 1.25 0 0.1 0.1 CIRCULAR 4 0 1 0.19%C21 Closed-Conduit DI521 I180 3.889 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 32.83%C210 Closed-Conduit MH028 MH055 183.041 0.014 0.8 0 0.1 0.1 CIRCULAR 4 0 1 0.13%C211 Closed-Conduit DI489 I034 45.218 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.85%C212 Closed-Conduit I034 MH054 177.178 0.013 0 0 0.1 0.1 CIRCULAR 1.25 0 1 2.14%C213 Closed-Conduit MH054 MH053 248.374 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.02%C214 Closed-Conduit DI505 MH052 138.714 0.014 0 0 0.1 0.1 CIRCULAR 0.75 0 1 3.68%C215 Closed-Conduit DI030 I175 15.549 0.014 1.35 0 0.1 0.1 CIRCULAR 1.25 0 1 5.84%C216 Closed-Conduit DI504 MH051 87.834 0.013 0 0 0.1 0.1 CIRCULAR 0.833 0 1 7.71%C217 Closed-Conduit DI078 MH059 25.788 0.012 2.1 0 0.1 0.1 CIRCULAR 2.5 0 1 10.39%C218_1 Closed-Conduit MH057 J41 103.508 0.013 0 0 0.1 0.1 CIRCULAR 4 0 1 0.03%C218_2 Closed-Conduit J41 MH059 172.004 0.013 0 0 0.1 0.1 CIRCULAR 4 0 1 0.03%C22 Closed-Conduit DI522 I025 11.44 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 6.14%C220_1 Closed-Conduit MH051 J21 9.88 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.15%C220_2 Closed-Conduit J21 MH052 72.095 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.16%C221 Closed-Conduit MH052 MH053 122.922 0.014 0.5 0.5 0.1 0.1 CIRCULAR 2 0 1 -2.35%C222 Closed-Conduit MH053 MH059 95.3 0.014 0.2 0 0.1 0.1 CIRCULAR 2 0 1 1.80%C223 Closed-Conduit MH059 MH062 72.769 0.014 0 0 0.1 0.1 CIRCULAR 3 0 1 4.03%C224 Closed-Conduit MH062 I029 128.951 0.014 0.1 0 0.1 0.1 CIRCULAR 3 0 1 0.27%C225 Closed-Conduit MH061 I030 126.083 0.014 0 0 0.1 0.1 CIRCULAR 3 0 1 1.16%C226 Closed-Conduit MH013 DI003 14.955 0.022 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.18%C227 Closed-Conduit DI036 I193 783.523 0.013 0 0 0.1 0.1 CIRCULAR 4 0 1 0.80%C228 Closed-Conduit MH062 MH061 8.948 0.014 0 0 0.1 0.1 CIRCULAR 6 0 1 -13.65%C23 Closed-Conduit DI523 DI272 16.654 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.36%C230 Closed-Conduit I031 MH061 8.997 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 10.51%C231_1 Closed-Conduit J39 J69 95.029 0.013 0 0 0.1 0.1 CIRCULAR 2 0 2 1.10%C231_2 Closed-Conduit J69 MH061 62.703 0.011 0 0 0.1 0.1 CIRCULAR 4 0 1 0.78%C233_1 Closed-Conduit J19 J20 43.412 0.022 0 0 0.1 0.1 CIRCULAR 2 0 1 0.44%C233_2 Closed-Conduit J20 J39 161.951 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 0.62%C234 Closed-Conduit DI082 MH050 35.025 0.014 0.25 0 0.1 0.1 CIRCULAR 1.5 0 1 3.95%C235_1 Closed-Conduit MH050 J19 171.219 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.16%C235_2 Closed-Conduit J19 MH049 12.547 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.17%C236 Closed-Conduit DI083 MH050 17.913 0.014 0.35 0.4 0.1 0.1 CIRCULAR 1 0 1 6.12%C237_1 Closed-Conduit MH048 MH044 89.199 0.022 0 0 0.1 0.1 HORIZ_ELLIPSE 1.83 3 2 0.34%C237_2 Closed-Conduit MH044 MH049 286.53 0.022 1.9 0 0.1 0.1 HORIZ_ELLIPSE 1.83 3 2 0.13%C238 Closed-Conduit I075 DI036 161.659 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.13%C239 Closed-Conduit DI495 I149 84.939 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.49%C24 Closed-Conduit DI529 I141 10.92 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 33.16%C240 Closed-Conduit I149 I150 68.147 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.38%C241 Closed-Conduit DI315 I150 81.716 0.011 1.08 0 0.1 0.1 CIRCULAR 0.67 0 1 0.09%C242_1 Closed-Conduit DI320 J37 11.316 0.013 0.75 0 0.1 0.1 CIRCULAR 1.5 0 1 2.37%C242_2 Closed-Conduit J37 DI321 43.039 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 2.37% 5 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C243 Closed-Conduit DI321 I155 61.322 0.014 1.75 0.25 0.1 0.1 CIRCULAR 1.25 0 1 2.64%C244 Closed-Conduit I150 I156 111.044 0.022 0 0 0.1 0.1 CIRCULAR 1 0 1 0.23%C245 Closed-Conduit DI324 I156 37.451 0.012 0.25 0 0.1 0.1 CIRCULAR 1 0 1 1.42%C246 Closed-Conduit I156 DI323 13.848 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.00%C247 Closed-Conduit DI323 J17 257.982 0.011 0 0 0.1 0.1 CIRCULAR 1 0 1 0.58%C248 Closed-Conduit I155 I157 63.162 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.08%C249_1 Closed-Conduit MH001 J60 66.083 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.51%C249_2 Closed-Conduit J60 J68 251.708 0.014 0 0 0.1 0.1 CIRCULAR 3 0 1 0.57%C25 Closed-Conduit DI526 I033 36.342 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.17%C250 Closed-Conduit DI325 I157 2.954 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 43.40%C251_1 Closed-Conduit I157 DI326 158.214 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.65%C251_2 Closed-Conduit DI326 I158 13.381 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.66%C252 Closed-Conduit DI326 I158 13.381 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 1.66%C253 Closed-Conduit I158 MH026 16.865 0.022 0 0.5 0.1 0.1 CIRCULAR 1.5 0 1 3.69%C254 Closed-Conduit DI327 I159 13.882 0.014 0.43 0 0.1 0.1 CIRCULAR 1.25 0 1 10.48%C255_1 Closed-Conduit MH026 J17 8.035 0.022 0.9 0 0.1 0.1 CIRCULAR 1.5 0 1 0.32%C255_3 Closed-Conduit J17 J18 154.525 0.022 0 0 0.1 0.1 CIRCULAR 1.25 0 1 0.32%C255_4 Closed-Conduit J18 MH057 434.805 0.022 0 0.1 0.1 0.1 CIRCULAR 1.25 0 1 0.32%C256 Closed-Conduit DI329 I161 68.211 0.012 1.1 0 0.1 0.1 CIRCULAR 1 0 1 2.42%C257 Closed-Conduit I161 DI328 111.062 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.31%C258 Closed-Conduit DI328 I159 20.583 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.51%C259 Closed-Conduit I159 MH026 24.947 0.014 0 0 0.1 0.1 CIRCULAR 1.25 0 1 -0.52%C26 Closed-Conduit DI007 DI009 39.557 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.38%C260 Closed-Conduit DI050 MH001 10.448 0.012 1.6 0.1 0.1 0.1 CIRCULAR 1 0 1 33.27%C261- Closed-Conduit DI331 DI330 126.379 0.014 0.25 0.5 0.1 0.1 CIRCULAR 1 0 1 0.10%C262 Closed-Conduit MH023 I162 9.475 0.022 0 0 0.1 0.1 CIRCULAR 1.5 0 1 8.22%C263 Closed-Conduit DI332 I162 3.353 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 231.93%C264 Closed-Conduit I162 MH024 220.223 0.022 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.34%C265 Closed-Conduit MH024 MH025 26.95 0.022 0 0.1 0.1 0.1 CIRCULAR 1.5 0 1 -3.09%C266 Closed-Conduit MH025 MH026 40.521 0.022 0 0 0.1 0.1 CIRCULAR 1.5 0 1 -1.71%C267 Closed-Conduit DI330 MH025 42.881 0.022 0.05 0 0.1 0.1 CIRCULAR 1.5 0 1 1.29%C268 Closed-Conduit MH023 MH022 58.783 0.022 0.7 0.5 0.1 0.1 CIRCULAR 1.5 0 1 2.83%C269 Closed-Conduit MH022 DI494 204.721 0.014 3.2 0 0.1 0.1 CIRCULAR 2 0 1 0.22%C27 Closed-Conduit DI509 I041 5.348 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 8.67%C270 Closed-Conduit DI494 MH026 117.423 0.014 0 0.8 0.1 0.1 CIRCULAR 1.5 0 1 0.49%C271_1 Closed-Conduit MH002 J56 58.88 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.92%C271_3 Closed-Conduit J56 J57 212.498 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 0.92%C271_4 Closed-Conduit J57 MH001 20.417 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 0.92%C272_1 Closed-Conduit MH022 J15 80.751 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.12%C272_2 Closed-Conduit J15 MH051 143.803 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.12%C273 Closed-Conduit DI316 I153 16.268 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.98%C274 Closed-Conduit DI318 I154 15.686 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.65%C275 Closed-Conduit I154 DI319 12.023 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 -3.02%C276 Closed-Conduit DI317 I153 15.493 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.59%C277 Closed-Conduit I153 I154 36.431 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.31%C278 Closed-Conduit DI090 DI519 40.693 0.012 0.5 0 0.1 0.1 CIRCULAR 1.5 0 1 3.07%C279 Closed-Conduit DI519 MH046 57.437 0.014 0.8 0 0.1 0.1 CIRCULAR 1.5 0 1 2.49%C28 Closed-Conduit DI511 DI180 223.098 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.22%C280 Closed-Conduit DI089 MH046 34.167 0.014 1.1 0 0.1 0.1 CIRCULAR 1 0 1 5.32%C281 Closed-Conduit MH046 I040 245.909 0.014 1 0 0.1 0.1 CIRCULAR 2 0 1 0.43%C282 Closed-Conduit DI070 MH002 10.051 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 18.53%C283 Closed-Conduit MH046 DI091 20.979 0.014 1.1 0 0.1 0.1 CIRCULAR 1 0 1 7.30%C284 Closed-Conduit I040 I039 44.8 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 0.00%C285 Closed-Conduit DI143 I071 36.393 0.022 0 0 0.1 0.1 CIRCULAR 1.5 0 1 3.89%C286 Closed-Conduit DI144 I071 11.316 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 5.55%C287 Closed-Conduit I071 I039 136.335 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.07%C288 Closed-Conduit I039 DI086 24.158 0.022 0 0 0.1 0.1 CIRCULAR 1.2 0 1 0.08%C290 Closed-Conduit DI088 I040 59.675 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.91%C291 Closed-Conduit DI091 DI092 239.4 0.013 2.1 0 0.1 0.1 CIRCULAR 1 0 1 -0.05%C292 Closed-Conduit DI092 I041 35.404 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.09%C293 Closed-Conduit DI080 DI076 19.342 0.012 0 0 0.1 0.1 CIRCULAR 1.25 0 1 6.55% 6 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C294 Closed-Conduit DI093 I041 4.154 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 8.21%C295 Closed-Conduit I041 I042 70.377 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.00%C296 Closed-Conduit DI095 I042 35.15 0.022 1.8 0 0.1 0.1 CIRCULAR 1.5 0 1 -1.31%C297 Closed-Conduit I042 I043 119.074 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.78%C298 Closed-Conduit DI096 I043 2.819 0.014 2.2 0 0.1 0.1 CIRCULAR 1.5 0 1 10.16%C299 Closed-Conduit I043 I044 107.259 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.09%C30 Closed-Conduit I095 I184 58.528 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 1.71%C300 Closed-Conduit DI097 I044 8.059 0.014 0 0 0.1 0.1 CIRCULAR 1.25 0 1 13.74%C301 Closed-Conduit DI098 I044 42.034 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 -2.14%C302 Closed-Conduit I045 DI098 29.329 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.03%C303 Closed-Conduit I044 I046 53.579 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.06%C304_1 Closed-Conduit DI076 J31 18.577 0.012 0.05 0 0.1 0.1 CIRCULAR 1.25 0 1 4.33%C304_2 Closed-Conduit J31 MH002 14.09 0.012 0 1.4 0.1 0.1 CIRCULAR 1.25 0 1 4.33%C306 Closed-Conduit DI100 I046 53.035 0.014 1.5 0 0.1 0.1 CIRCULAR 1.5 0 1 2.22%C307 Closed-Conduit I046 I047 14.261 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.14%C308 Closed-Conduit DI102 DI101 75.641 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.31%C309 Closed-Conduit DI101 I047 7.69 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.98%C31 Closed-Conduit I184 DI513 226.333 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.09%C310_1 Closed-Conduit I047 I999 101.681 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.03%C310_2 Closed-Conduit I999 I048 58.13 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.84%C311 Closed-Conduit DI503 I049 82.119 0.013 0 0 0.1 0.1 CIRCULAR 4 0 1 5.47%C312 Closed-Conduit DI123 DI124 71.873 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 3.66%C313 Closed-Conduit DI125 DI124 69.504 0.022 1 1.05 0.1 0.1 CIRCULAR 1.5 0 1 0.11%C314 Closed-Conduit DI124 I045 58.844 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.06%C315_1 Closed-Conduit I035 J53 144.233 0.012 0 0 0.1 0.1 CIRCULAR 2 0 1 1.80%C315_2 Closed-Conduit J53 MH002 138.779 0.012 0 2.75 0.1 0.1 CIRCULAR 2 0 1 1.80%C316 Closed-Conduit DI103 I707 165.106 0.014 0 0 0.1 0.1 CIRCULAR 2.5 0 1 0.00%C317 Closed-Conduit DI104 DI103 41.273 0.014 0.9 0.5 0.1 0.1 CIRCULAR 2.5 0 1 0.09%C318 Closed-Conduit DI105 DI104 279.893 0.014 1.25 0 0.1 0.1 CIRCULAR 2.5 0 1 0.27%C319 Closed-Conduit DI106 DI105 307.904 0.014 0.5 0 0.1 0.1 CIRCULAR 2.5 0 1 0.25%C320 Closed-Conduit DI107 DI106 58.9 0.014 0.2 0.1 0.1 0.1 CIRCULAR 2 0 1 0.60%C321 Closed-Conduit DI111 DI110 28.75 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 0.85%C322 Closed-Conduit DI110 I051 70.266 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.35%C323 Closed-Conduit DI109 DI107 239.611 0.014 0.1 0 0.1 0.1 CIRCULAR 2 0 1 0.73%C324 Closed-Conduit I051 DI109 90.815 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 0.03%C325 Closed-Conduit I052 I051 232.604 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 -0.01%C326 Closed-Conduit DI087 I035 2.471 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 43.10%C327 Closed-Conduit DI112 I052 22.346 0.011 1 0 0.1 0.1 CIRCULAR 1 0 1 7.70%C328 Closed-Conduit DI113 I052 15.667 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 6.00E-05C329 Closed-Conduit DI114 DI113 152.74 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.42%C331 Closed-Conduit I053 I189 65.651 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.76%C333 Closed-Conduit DI117 DI115 52.314 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.21%C334 Closed-Conduit I054 I053 72.278 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.14%C335 Closed-Conduit DI115 I054 55.553 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.18%C336 Closed-Conduit I055 I054 17.927 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.34%C338_1 Closed-Conduit DI099 J24 51.995 0.012 1 0 0.1 0.1 CIRCULAR 1 0 1 2.50%C338_3 Closed-Conduit J24 J29 225.552 0.012 0 0 0.1 0.1 CIRCULAR 2 0 1 0.57%C338_4 Closed-Conduit J29 I035 37.108 0.012 0 0 0.1 0.1 CIRCULAR 2 0 1 0.57%C339 Closed-Conduit I056 I055 48.653 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.06%C34 Closed-Conduit DI201 DI514 13.359 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.65%C340 Closed-Conduit DI119 I056 92.201 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.05%C341 Closed-Conduit DI121 DI120 73.045 0.011 0 0.45 0.1 0.1 CIRCULAR 0.67 0 1 0.40%C342 Closed-Conduit DI120 DI119 27.477 0.014 0.47 0.03 0.1 0.1 CIRCULAR 1 0 1 1.82%C343 Closed-Conduit I058 I057 134.498 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.22%C344 Closed-Conduit I059 I058 27.613 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.36%C345 Closed-Conduit DI501 I059 165.181 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.61%C346 Closed-Conduit DI126 I060 147.268 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.12%C347 Closed-Conduit DI127 DI126 40.753 0.022 0.7 0.5 0.1 0.1 CIRCULAR 0.75 0 1 2.16%C348 Closed-Conduit DI128 DI126 209.096 0.014 0 0 0.1 0.1 FILLED_CIRCULAR 1.5 1 1 0.08%C349_1 Closed-Conduit DI094 J30 34.846 0.013 1 0 0.1 0.1 CIRCULAR 1 0 1 1.91%C349_2 Closed-Conduit J30 DI087 14.118 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.91% 7 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C35 Overland I029 I030 14.258 0.022 0 0 0 0 RECT_OPEN 8 40 1 0.00%C350 Closed-Conduit DI129 DI128 54.591 0.012 0 0.77 0.1 0.1 CIRCULAR 1.25 0 1 2.21%C351 Closed-Conduit I061 DI128 39.798 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.01%C352 Closed-Conduit DI142 I063 1047.828 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.07%C353 Closed-Conduit I070 DI142 525.758 0.011 1.9 0.83 0.1 0.1 CIRCULAR 0.67 0 1 0.51%C354 Closed-Conduit I065 I061 423.02 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.02%C355 Closed-Conduit DI133 DI132 32.086 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 6.11%C356 Closed-Conduit DI131 DI130 47.494 0.012 1 0 0.1 0.1 CIRCULAR 1.5 0 1 1.94%C357 Closed-Conduit DI132 DI130 39.749 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.25%C358 Closed-Conduit DI130 I065 288.601 0.013 1.1 1.1 0.1 0.1 CIRCULAR 1.5 0 1 0.57%C359 Closed-Conduit I064 I065 153.361 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.07%C36 Street I113 DI207 1965.266 0.017 0.8 0.8 0.1 0.1 STREET 0 0 1 0.37% NorthcrestC360_1 Closed-Conduit MH006 I180 185.293 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.55%C360_2 Closed-Conduit I180 DI087 116.036 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.63%C361 Closed-Conduit DI134 I064 324.077 0.013 0 0.75 0.1 0.1 CIRCULAR 1.5 0 1 0.68%C362 Closed-Conduit DI135 I064 225.928 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.44%C363 Closed-Conduit I066 DI135 57.135 0.014 1.7 0 0.1 0.1 CIRCULAR 1.5 0 1 2.98%C364 Closed-Conduit DI137 I066 9.434 0.013 2 1.7 0.1 0.1 CIRCULAR 1 0 1 0.87%C365 Closed-Conduit DI139 I067 21.423 0.014 0.7 0 0.1 0.1 CIRCULAR 1.25 0 1 2.37%C366 Closed-Conduit DI138 I067 22.426 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.38%C367 Closed-Conduit I067 I066 325.589 0.013 0 1.7 0.1 0.1 CIRCULAR 1.5 0 1 0.84%C368 Closed-Conduit I068 DI137 98.081 0.014 0 2 0.1 0.1 CIRCULAR 1 0 1 0.02%C369 Closed-Conduit DI140 I068 10.991 0.011 0.75 0 0.1 0.1 CIRCULAR 0.75 0 1 9.84%C370 Closed-Conduit I069 I068 71.248 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.38%C371 Closed-Conduit I050 MH006 6.793 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 71.53%C372 Closed-Conduit DI141 I069 15.809 0.011 1.75 0 0.1 0.1 CIRCULAR 0.75 0 1 6.18%C373 Closed-Conduit DI515 I069 249.785 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.33%C374 Closed-Conduit DI165 I085 8.035 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 13.59%C375 Closed-Conduit I085 DI163 276.611 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.80%C376 Closed-Conduit DI164 DI163 21.897 0.014 0 0.85 0.1 0.1 CIRCULAR 1.25 0 1 0.43%C377 Closed-Conduit DI163 DI162 39.693 0.014 1.1 0.4 0.1 0.1 CIRCULAR 1 0 1 3.75%C378 Closed-Conduit DI162 I084 12.777 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 3.03%C379 Closed-Conduit I084 MH036 604.4 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 1.18%C38 Overland J2 DI513 106.035 0.014 0 0 0 0 RECT_OPEN 1 50 1 -2.33%C380 Closed-Conduit MH036 MH037 267.631 0.014 0.4 1.15 0.1 0.1 CIRCULAR 1.5 0 1 0.14%C381 Closed-Conduit DI158 MH037 19.249 0.014 0.17 0.4 0.1 0.1 CIRCULAR 1 0 1 5.59%C382 Closed-Conduit DI116 MH006 38.156 0.014 0.1 1 0.1 0.1 CIRCULAR 1 0 1 6.64%C383 Closed-Conduit DI157 I082 23.548 0.014 1 0.1 0.1 0.1 CIRCULAR 1 0 1 11.55%C384 Closed-Conduit MH037 I082 40.548 0.014 1 0 0.1 0.1 CIRCULAR 2 0 1 4.26%C385 Closed-Conduit I082 I081 246.514 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.16%C386 Closed-Conduit DI156 I081 11.465 0.014 1 0.3 0.1 0.1 CIRCULAR 1 0 1 15.64%C387 Closed-Conduit I081 I080 16.119 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 6.84%C388 Closed-Conduit DI155 MH038 24.242 0.014 0 0.05 0.1 0.1 CIRCULAR 1 0 1 8.15%C389 Closed-Conduit I080 MH038 22.316 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 1.51%C39 Street DI003 DI525 224.66 0.017 2.1 3.1 0.1 0.1 STREET 0 0 1 1.50% 2ndStreetC390 Closed-Conduit DI160 DI161 61.074 0.014 0.43 0.03 0.1 0.1 CIRCULAR 1 0 1 1.64%C391 Closed-Conduit DI161 I083 54.668 0.014 0.8 0.45 0.1 0.1 CIRCULAR 1 0 1 2.29%C392 Closed-Conduit I083 I080 258.499 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.74%C393 Closed-Conduit I062 MH006 136.486 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.44%C394 Closed-Conduit MH038 I079 163.306 0.014 3 0 0.1 0.1 CIRCULAR 2 0 1 3.78%C395 Closed-Conduit DI154 I079 9.273 0.012 2.2 0 0.1 0.1 CIRCULAR 2 0 1 35.96%C396 Closed-Conduit I079 MH039 137.535 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 1.64%C397 Closed-Conduit DI152 MH039 40.601 0.014 0 0.75 0.1 0.1 CIRCULAR 1 0 1 8.72%C398 Closed-Conduit MH039 I078 285.244 0.014 3.8 0.5 0.1 0.1 CIRCULAR 2 0 1 2.47%C399 Closed-Conduit DI151 I078 32.789 0.014 0.5 0 0.1 0.1 CIRCULAR 1 0 1 8.69%C4 Street DI055 DI052 1093.064 0.017 0.4 3.9 0.1 0.1 STREET 0 0 1 0.15% StreetC40 Closed-Conduit DI028 DI029 39.45 0.013 1.2 0 0.1 0.1 CIRCULAR 1 0 1 1.23%C400 Closed-Conduit DI150 I078 9.841 0.011 0.75 0 0.1 0.1 CIRCULAR 0.5 0 1 27.54%C401 Closed-Conduit I078 I077 15.568 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 9.68%C402 Closed-Conduit DI149 DI148 36.34 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 3.09%C403 Closed-Conduit DI148 DI147 39.689 0.014 0 0.08 0.1 0.1 CIRCULAR 1 0 1 2.70% 8 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C404 Closed-Conduit DI122 I062 12.785 0.014 2 0 0.1 0.1 CIRCULAR 1.25 0 1 5.46%C405 Closed-Conduit DI147 I074 107.386 0.014 0.8 0 0.1 0.1 CIRCULAR 1 0 1 1.77%C406 Closed-Conduit I077 I074 33.528 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 5.38%C407 Closed-Conduit DI350 I166 44.077 0.012 1.25 0 0.1 0.1 CIRCULAR 1 0 1 4.18%C408 Closed-Conduit DI351 I166 23.12 0.012 2.53 0.12 0.1 0.1 CIRCULAR 0.67 0 1 7.75%C409 Closed-Conduit I166 I077 295.134 0.013 0 0 0.1 0.1 CIRCULAR 1.25 0 1 0.51%C41 Street DI029 DI022 286.126 0.017 2.1 2.85 0.1 0.1 STREET 0 0 1 0.22% 5thStreetC410 Closed-Conduit I074 I072 266.001 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.77%C411 Closed-Conduit DI145 DI146 62.126 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 2.25%C412 Closed-Conduit DI146 I072 165.491 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.14%C413 Closed-Conduit I073 I072 9.541 0.013 0 0 0.1 0.1 CIRCULAR 2.5 0 1 6.30%C414 Closed-Conduit I072 MH048 241.246 0.013 0 0 0.1 0.1 HORIZ_ELLIPSE 1.83 3 2 1.27%C415 Closed-Conduit DI136 I062 26.791 0.014 2.1 0 0.1 0.1 CIRCULAR 1 0 1 2.98%C416 Closed-Conduit DI086 DI085 79.003 0.014 0 0 0.1 0.1 CIRCULAR 1.25 0 1 0.08%C417 Closed-Conduit DI085 DI084 40.341 0.013 0.5 0 0.1 0.1 CIRCULAR 1 0 1 1.08%C418 Closed-Conduit DI085 MH044 177.398 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.78%C419 Closed-Conduit I036 MH048 65.356 0.013 0.2 0 0.1 0.1 CIRCULAR 1 0 1 1.92%C42 Closed-Conduit MH070 DI033 246.292 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.34%C420_1 Closed-Conduit MH045 MH058 253.762 0.014 0 0 0.1 0.1 CIRCULAR 3 0 2 0.55%C420_2 Closed-Conduit MH058 J40 23.91 0.014 0 0 0.1 0.1 CIRCULAR 3 0 2 2.54%C420_4 Closed-Conduit J40 MH062 62.896 0.011 0 0.1 0.1 0.1 CIRCULAR 4 0 1 2.54%C421 Closed-Conduit I028 MH062 213.223 0.022 0 0 0.1 0.1 CIRCULAR 3 0 1 1.31%C422 Closed-Conduit DI075 I028 19.608 0.014 0.9 0 0.1 0.1 CIRCULAR 1 0 1 12.63%C423_1 Closed-Conduit I027 J43 131.328 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.01%C423_2 Closed-Conduit J43 J46 87.236 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.01%C423_4 Closed-Conduit J45 I028 71.787 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.01%C423_5 Closed-Conduit J46 J45 74.29 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.01%C424 Closed-Conduit DI074 I027 17.919 0.014 1.2 0 0.1 0.1 CIRCULAR 1 0 1 17.73%C425_2 Closed-Conduit J47 MH064 272.842 0.022 0 0 0.1 0.1 FILLED_CIRCULAR 3 0.25 1 0.54%C425_3 Closed-Conduit MH063 I027 42.614 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.12%C425_4 Closed-Conduit MH064 MH063 16.387 0.022 2.5 2 0.1 0.1 FILLED_CIRCULAR 3 0.25 1 1.04%C426 Closed-Conduit MH007 I062 146.935 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.27%C427_1 Closed-Conduit DI072 J48 18.635 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.92%C427_2 Closed-Conduit DI073 J48 21.97 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 -1.88%C428_1 Closed-Conduit MH066 J47 325.913 0.022 1.5 0 0.1 0.1 FILLED_CIRCULAR 3 0.25 1 0.18%C428_2 Closed-Conduit I026 MH066 127.986 0.022 0 0 0.1 0.1 FILLED_CIRCULAR 3 0.25 1 0.49%C429 Closed-Conduit DI338 I164 37.454 0.014 2.25 0 0.1 0.1 CIRCULAR 1 0 1 11.76%C43 Closed-Conduit DI301 J8 33.302 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 5.54%C430 Closed-Conduit DI339 I164 15.827 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.82%C431 Closed-Conduit I164 MH021 7.907 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.15%C432 Closed-Conduit DI355 DI354 19.178 0.014 0.33 1 0.1 0.1 CIRCULAR 0.25 0 1 13.09%C433 Closed-Conduit DI354 I167 37.556 0.014 0.12 0.45 0.1 0.1 CIRCULAR 1.25 0 1 3.96%C434 Closed-Conduit DI352 I167 5.411 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 12.40%C435 Closed-Conduit I167 I164 301.163 0.014 3.75 0 0.1 0.1 CIRCULAR 1.5 0 1 2.74%C436 Closed-Conduit MH021 MH020 254.895 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.65%C437 Closed-Conduit I076 MH007 12.845 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.57%C438 Closed-Conduit DI341 MH020 8.296 0.014 1.5 0 0.1 0.1 CIRCULAR 1 0 1 24.62%C439 Closed-Conduit DI342 MH020 33.404 0.014 1.23 0 0.1 0.1 CIRCULAR 0.67 0 1 6.50%C44 Street DI302 DI300 318.924 0.017 4.1 3.6 0.1 0.1 STREET 0 0 1 1.03% FStreetC440 Closed-Conduit DI340 MH020 29.091 0.014 0 0 0.1 0.1 CIRCULAR 1.6 0 1 4.79%C441 Closed-Conduit MH020 I165 64.54 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.02%C442 Closed-Conduit DI343 I165 10.166 0.014 1.65 0 0.1 0.1 CIRCULAR 1.25 0 1 12.81%C443 Closed-Conduit DI345 I165 30.413 0.014 0.4 0 0.1 0.1 CIRCULAR 1 0 1 4.10%C444 Closed-Conduit I165 I073 267.599 0.013 0 0 0.1 0.1 CIRCULAR 2.5 0 1 0.02%C445 Closed-Conduit DI346 DI347 27.225 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.65%C446 Closed-Conduit DI349 DI348 22.351 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.07%C447 Closed-Conduit DI357 MH019 39.073 0.012 1.8 0 0.1 0.1 CIRCULAR 1 0 1 7.18%C449 Closed-Conduit DI153 I076 29.554 0.014 0.45 0 0.1 0.1 CIRCULAR 1.5 0 1 3.23%C45 Closed-Conduit DI306 I143 11.334 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 10.29%C450 Closed-Conduit DI358 MH019 30.481 0.014 1.45 0 0.1 0.1 CIRCULAR 1 0 1 5.33%C451 Closed-Conduit DI356 MH019 13.07 0.014 1.25 0 0.1 0.1 CIRCULAR 1 0 1 12.87% 9 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C452 Closed-Conduit MH019 I167 292.042 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 2.44%C453 Closed-Conduit DI175 DI174 69.925 0.012 1.5 0 0.1 0.1 CIRCULAR 1.25 0 1 2.24%C454 Closed-Conduit DI174 DI173 510.054 0.013 0 0 0.1 0.1 CIRCULAR 1.25 0 1 0.75%C455 Closed-Conduit DI173 I091 43.228 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.80%C456 Closed-Conduit I091 I090 17.02 0.014 1.1 0 0.1 0.1 CIRCULAR 1.5 0 1 8.85%C457 Closed-Conduit DI172 I091 2.75 0.014 1.1 1.1 0.1 0.1 CIRCULAR 1.5 0 1 27.49%C458 Closed-Conduit DI171 I088 12.724 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 20.88%C459 Closed-Conduit I090 I088 40.329 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.74%C46 Closed-Conduit I160 I151 21.558 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.32%C460_1 Closed-Conduit MH008 I025 234.378 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.08%C460_2 Closed-Conduit I025 I076 25.814 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.55%C461 Closed-Conduit DI170 I090 20.77 0.012 1.5 0.5 0.1 0.1 CIRCULAR 1.2 0 1 12.70%C462_1 Closed-Conduit I088 DI520 23.798 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.20%C462_2 Closed-Conduit DI520 DI169 221.26 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 5.38%C463 Closed-Conduit DI168 DI169 36.08 0.014 0.1 0 0.1 0.1 CIRCULAR 1 0 1 2.09%C464 Closed-Conduit DI169 I087 267.567 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 3.57%C465 Closed-Conduit DI167 DI166 45.034 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.16%C466 Closed-Conduit DI166 I086 88.983 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 6.81%C467 Closed-Conduit I092 I093 187.227 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 -1.60%C468 Closed-Conduit DI177 DI176 95.544 0.011 0 0 0.1 0.1 CIRCULAR 0.5 0 1 2.88%C469 Closed-Conduit I093 DI176 80.044 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 0.63%C47 Closed-Conduit I151 I143 305.688 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.31%C470 Closed-Conduit DI176 I002 139.464 0.014 0.25 0.25 0.1 0.1 CIRCULAR 1 0 1 3.95%C471 Closed-Conduit DI159 MH008 12.107 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 4.95%C472 Closed-Conduit DI182 I002 75.992 0.022 0 0.35 0.1 0.1 CIRCULAR 1.5 0 1 8.42%C473 Closed-Conduit DI181 DI182 54.05 0.014 0 0.05 0.1 0.1 CIRCULAR 1.5 0 1 1.31%C474 Closed-Conduit DI180 DI179 120.681 0.014 0.1 0.4 0.1 0.1 CIRCULAR 1.5 0 1 0.32%C475 Closed-Conduit DI179 DI176 161.281 0.014 1.5 0 0.1 0.1 CIRCULAR 1.5 0 1 1.86%C476 Closed-Conduit I094 I095 152.541 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.33%C478 Closed-Conduit I096 DI183 273.777 0.014 0.15 0 0.1 0.1 CIRCULAR 3 0 1 -0.20%C479 Closed-Conduit DI184 DI186 266.755 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.56%C48 Closed-Conduit DI187 I096 6.807 0.013 1.65 1.65 0.1 0.1 CIRCULAR 1.5 0 1 0.00%C480 Closed-Conduit DI186 I096 44.866 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 3.81%C481 Closed-Conduit DI188 I097 4.403 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 22.05%C482 Closed-Conduit I089 MH008 34.752 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.90%C483 Closed-Conduit I097 I096 91.412 0.014 0 0 0.1 0.1 CIRCULAR 3 0 1 3.29%C484 Closed-Conduit I098 I097 213.305 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.75%C485 Closed-Conduit DI189 I098 58.446 0.014 2.25 0 0.1 0.1 CIRCULAR 2.5 0 1 4.14%C486 Closed-Conduit DI191 DI189 223.569 0.014 0.05 0 0.1 0.1 CIRCULAR 2 0 1 1.15%C487 Closed-Conduit I099 DI190 9.92 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.32%C488 Closed-Conduit DI374 I099 311.469 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.97%C489 Closed-Conduit DI193 DI191 130.13 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 0.74%C49 Closed-Conduit DI183 I094 160.4 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.74%C490 Closed-Conduit DI194 DI193 148.512 0.014 2.05 0.45 0.1 0.1 CIRCULAR 2.75 0 1 2.37%C491 Closed-Conduit DI196 DI195 229.209 0.013 1.5 0.4 0.1 0.1 CIRCULAR 1.5 0 1 0.47%C492 Closed-Conduit DI197 DI196 99.188 0.013 0.1 0 0.1 0.1 CIRCULAR 1.5 0 1 0.70%C493 Closed-Conduit DI178 I089 15.577 0.014 1.8 0 0.1 0.1 CIRCULAR 1 0 1 10.44%C494 Closed-Conduit DI198 DI197 56.367 0.014 0.25 0 0.1 0.1 CIRCULAR 1.5 0 1 0.41%C495 Closed-Conduit DI199 DI198 97.875 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.15%C496 Closed-Conduit I100 DI199 113.963 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.16%C497 Closed-Conduit DI202 DI201 102.006 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.25%C498 Closed-Conduit DI203 DI202 37.185 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.54%C499 Closed-Conduit DI204 DI203 263.017 0.014 0.4 0 0.1 0.1 CIRCULAR 1.5 0 1 1.24%C500 Closed-Conduit DI205 DI204 175.663 0.014 0.77 0.17 0.1 0.1 CIRCULAR 1.5 0 1 0.93%C501 Closed-Conduit DI206 DI205 61.447 0.014 0 0.75 0.1 0.1 CIRCULAR 1.25 0 1 2.58%C502 Closed-Conduit DI207 DI206 113.079 0.014 0 0 0.1 0.1 CIRCULAR 1.25 0 1 1.55%C503 Closed-Conduit DI214 DI213 81.507 0.012 1.5 0.5 0.1 0.1 CIRCULAR 1.5 0 1 2.72%C504 Closed-Conduit MH035 I089 304.52 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.34%C505_1 Closed-Conduit DI213 DI518 494.982 0.013 0 1 0.1 0.1 CIRCULAR 1 0 1 0.17%C505_2 Closed-Conduit DI518 DI215 186.533 0.013 1 0 0.1 0.1 CIRCULAR 1 0 1 0.10%C506 Closed-Conduit DI215 I102 79.766 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.71% 10 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C508 Closed-Conduit DI217 DI216 82.465 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 3.91%C509 Closed-Conduit DI216 I102 230.035 0.014 2.1 0 0.1 0.1 CIRCULAR 1.5 0 1 1.00%C510 Closed-Conduit DI500 DI499 366.6 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.32%C511 Closed-Conduit DI499 DI498 38.771 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.22%C512 Closed-Conduit DI498 DI228 313.961 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.73%C513 Closed-Conduit DI228 DI229 41.674 0.012 0.6 0.5 0.1 0.1 CIRCULAR 1.5 0 1 0.71%C514 Closed-Conduit DI229 I107 213.752 0.014 0.12 0 0.1 0.1 CIRCULAR 2 0 1 0.46%C515 Closed-Conduit DI185 MH035 13.763 0.014 1 0 0.1 0.1 CIRCULAR 1.5 0 1 9.15%C516 Closed-Conduit DI230 I107 12.52 0.013 2.17 0 0.1 0.1 CIRCULAR 2.5 0 1 1.76%C517 Closed-Conduit DI231 I108 16.088 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 9.76%C518 Closed-Conduit I107 I108 55.491 0.014 0 0 0.1 0.1 CIRCULAR 2.5 0 1 7.01%C519 Closed-Conduit I108 I109 256.982 0.014 0 0 0.1 0.1 CIRCULAR 2.5 0 1 1.17%C520 Closed-Conduit DI232 I109 9.667 0.012 1.25 0 0.1 0.1 CIRCULAR 1.5 0 1 87.90%C521 Closed-Conduit I109 I110 453.491 0.013 0 0 0.1 0.1 CIRCULAR 2.5 0 1 1.58%C522 Closed-Conduit DI226 I105 107.987 0.014 4.2 0 0.1 0.1 CIRCULAR 2 0 1 6.58%C523 Closed-Conduit DI225 DI226 39.681 0.014 0.2 0 0.1 0.1 CIRCULAR 2 0 1 1.05%C524 Closed-Conduit DI223 DI225 260.44 0.014 0.6 0 0.1 0.1 CIRCULAR 2 0 1 1.20%C525 Closed-Conduit DI224 DI223 39.472 0.014 0.85 0 0.1 0.1 CIRCULAR 1.5 0 1 3.87%C526 Closed-Conduit DI200 MH035 47.6 0.014 3.6 0 0.1 0.1 CIRCULAR 1 0 1 2.83%C527 Closed-Conduit DI222 DI223 349.25 0.014 1.15 0 0.1 0.1 CIRCULAR 1.25 0 1 0.92%C528 Closed-Conduit DI221 DI222 89.396 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 3.92%C529 Closed-Conduit DI208 I101 96.141 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 3.09%C530 Closed-Conduit DI236 I112 346.329 0.014 0 5.2 0.1 0.1 CIRCULAR 1.5 0 1 0.06%C531 Closed-Conduit DI235 DI236 26.562 0.014 0 0.27 0.1 0.1 CIRCULAR 1.5 0 1 11.08%C532 Closed-Conduit DI234 DI235 63.346 0.014 0 0.15 0.1 0.1 CIRCULAR 1.5 0 1 1.02%C533 Closed-Conduit I111 DI234 537.472 0.014 0 0 0.1 0.1 CIRCULAR 1.25 0 1 0.45%C535 Closed-Conduit I115 I114 46.31 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.67%C537 Closed-Conduit MH010 MH035 301.176 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.66%C539 Closed-Conduit DI237 DI238 41.663 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 8.15%C540 Closed-Conduit DI238 I116 194.174 0.014 2.1 0 0.1 0.1 CIRCULAR 1.5 0 1 2.87%C541 Closed-Conduit I117 DI238 320.929 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 9.00E-05C542 Closed-Conduit I118 I117 260.059 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.19%C544 Closed-Conduit DI240 DI239 40.241 0.014 0.15 0 0.1 0.1 CIRCULAR 1 0 1 0.27%C545 Closed-Conduit DI239 I118 68.779 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 6.80%C546 Closed-Conduit DI536 I118 63.343 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 8.26%C547 Closed-Conduit DI241 DI242 92.78 0.014 0.7 0 0.1 0.1 CIRCULAR 1.5 0 1 1.32%C548 Closed-Conduit I172 I191 87.318 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 1.26%C549 Closed-Conduit DI242 DI243 106.14 0.014 0 0.15 0.1 0.1 CIRCULAR 2 0 1 0.28%C550 Closed-Conduit DI243 DI245 104.718 0.014 0.75 0 0.1 0.1 CIRCULAR 2 0 1 0.98%C551 Closed-Conduit DI245 DI246 77.129 0.014 0.1 0 0.1 0.1 CIRCULAR 2.75 0 1 0.36%C552 Closed-Conduit DI244 DI243 51.765 0.014 0 0.4 0.1 0.1 CIRCULAR 1.25 0 1 1.15%C553 Closed-Conduit DI246 I122 195.49 0.014 0.1 0.1 0.1 0.1 CIRCULAR 2.25 0 1 0.65%C554 Closed-Conduit DI249 DI247 39.445 0.014 0 0.8 0.1 0.1 CIRCULAR 1 0 1 1.12%C555 Closed-Conduit I122 DI247 4.65 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.11%C556 Closed-Conduit DI247 I123 91.645 0.014 0.7 0 0.1 0.1 CIRCULAR 2.5 0 1 1.31%C557 Closed-Conduit I174 I173 163.014 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.31%C558 Closed-Conduit DI021 DI020 39.368 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.63%C559 Closed-Conduit I171 I172 75.413 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 3.70%C560 Closed-Conduit DI024 I171 46.515 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 4.96%C561 Closed-Conduit I173 I171 284.503 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.43%C562 Closed-Conduit DI001 I174 24.039 0.012 0.8 0 0.1 0.1 CIRCULAR 1.5 0 1 5.62%C563 Closed-Conduit DI002 I174 17.436 0.014 0.9 0.2 0.1 0.1 CIRCULAR 1 0 1 3.43%C564 Closed-Conduit I176 I173 30.042 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 5.50%C565 Closed-Conduit DI025 I176 7.778 0.014 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.85%C566 Closed-Conduit DI026 I176 34.921 0.014 1 0 0.1 0.1 CIRCULAR 1.5 0 1 9.49%C568 Closed-Conduit DI027 DI028 26.25 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 7.39%C569 Closed-Conduit DI020 I075 68.93 0.013 1.5 0 0.1 0.1 CIRCULAR 1 0 1 0.53%C57 Closed-Conduit DI003 DI533 111.003 0.013 0 0 0.1 0.1 FILLED_CIRCULAR 2 1.99 1 0.88%C572_1 Closed-Conduit DI022 DI532 40.73 0.013 0 0 0.1 0.1 FILLED_CIRCULAR 1.5 1.25 1 4.49%C572_2 Closed-Conduit DI532 DI023 48.498 0.013 0 0 0.1 0.1 FILLED_CIRCULAR 1.5 1.25 1 1.27%C573 Closed-Conduit DI023 OF8 74.548 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 22.08% 11 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C575_1 Closed-Conduit I181 OF6 111.001 0.013 0 0 0.1 0.1 CIRCULAR 4 0 1 12.94%C576 Closed-Conduit DI369 I181 14.617 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 109.60%C577 Closed-Conduit I179 I181 37.803 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 18.16%C578 Closed-Conduit DI368 I179 20.919 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 23.56%C579 Closed-Conduit MH017 I179 16.31 0.013 0 0 0.1 0.1 CIRCULAR 2.5 0 1 6.54%C58 Closed-Conduit DI533 J107 89.414 0.013 0 0 0.1 0.1 FILLED_CIRCULAR 2 1.99 1 3.06%C580 Closed-Conduit I038 I075 87.015 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.22%C581 Closed-Conduit I178 MH017 70.858 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 2.73%C582 Closed-Conduit DI366 I178 15.931 0.014 1.1 0 0.1 0.1 CIRCULAR 1 0 1 18.59%C583 Closed-Conduit I177 I178 239.068 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.63%C584 Closed-Conduit DI365 I177 26.259 0.014 0.05 0.8 0.1 0.1 CIRCULAR 0.5 0 1 7.91%C585 Closed-Conduit MH018 I177 39.437 0.012 0 0 0.1 0.1 CIRCULAR 0.75 0 1 1.48%C586 Closed-Conduit DI364 MH018 13.735 0.012 0 0 0.1 0.1 CIRCULAR 0.75 0 1 10.08%C587 Closed-Conduit DI490 MH018 42.726 0.014 0 0 0.1 0.1 CIRCULAR 0.75 0 1 5.10%C588 Closed-Conduit DI370 I182 7.956 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 32.91%C589 Closed-Conduit I182 MH017 238.918 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 2.26%C59 Closed-Conduit J107 OF7 58.398 0.013 0 0 0.1 0.1 FILLED_CIRCULAR 2 1.99 1 1.25%C590 Closed-Conduit DI371 MH016 47.898 0.012 0 0.85 0.1 0.1 CIRCULAR 1.25 0 1 4.20%C591 Closed-Conduit MH015 I038 17.619 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 2.17%C592 Closed-Conduit MH016 I182 46.668 0.014 2.7 0 0.1 0.1 CIRCULAR 2.5 0 1 2.82%C593 Closed-Conduit DI372 MH016 11.508 0.014 0.5 2.7 0.1 0.1 CIRCULAR 1.5 0 1 1.60%C594 Closed-Conduit DI031 I004 20.412 0.014 0.5 0 0.1 0.1 CIRCULAR 1 0 1 3.80%C595 Closed-Conduit DI373 I005 9.875 0.014 0.2 0 0.1 0.1 CIRCULAR 1 0 1 7.25%C596 Closed-Conduit I005 I004 45.95 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 0.42%C597 Closed-Conduit I004 DI372 277.929 0.014 0 1.5 0.1 0.1 CIRCULAR 1 0 1 1.06%C598 Closed-Conduit DI041 DI042 40.005 0.014 0.2 0 0.1 0.1 CIRCULAR 4 0 1 0.92%C599_2 Closed-Conduit DI042 I001 201.498 0.013 0 0 0.1 0.1 CIRCULAR 4 0 1 8.11%C599_3 Closed-Conduit I001 I192 84.417 0.013 0 0 0.1 0.1 RECT_OPEN 4 4 1 6.53%C60 Closed-Conduit J61 J62 26.15 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 -38.44%C60_2 Closed-Conduit J62 MH012 373.507 0.011 0 0 0.1 0.1 CIRCULAR 3 0 1 0.52%C60_3 Closed-Conduit J1 J64 83.299 0.011 0 0 0.1 0.1 CIRCULAR 3.5 0 1 0.52%C60_4 Closed-Conduit J64 J62 131.044 0.011 0 0 0.1 0.1 CIRCULAR 3.5 0 1 0.52%C600 Closed-Conduit DI039 DI040 40.234 0.014 0.85 0 0.1 0.1 FILLED_CIRCULAR 3 1 1 4.31%C601 Closed-Conduit DI040 DI041 210.825 0.013 0.4 0 0.1 0.1 CIRCULAR 3.5 0 1 0.90%C602 Closed-Conduit DI005 MH014 239.216 0.012 1.8 0 0.1 0.1 CIRCULAR 1.5 0 1 2.75%C61 Closed-Conduit J66 J67 19.173 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 3.61%C61_1 Closed-Conduit DI036 J67 244.816 0.011 0 0 0.1 0.1 CIRCULAR 3.5 0 1 -0.21%C61_2 Closed-Conduit J67 J1 93.345 0.011 0 0 0.1 0.1 CIRCULAR 3.5 0 1 -0.21%C62 Closed-Conduit J28 J27 21.2 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 2.97%C62_1 Closed-Conduit DI302 J28 15.247 0.011 0 0 0.1 0.1 CIRCULAR 3 0 1 1.30%C62_2 Closed-Conduit J28 MH032 279.077 0.011 0 0 0.1 0.1 CIRCULAR 2 0 2 1.30%C63 Closed-Conduit I136 MH067 93.248 0.011 0 0 0.1 0.1 CIRCULAR 1.5 0 1 -1.61%C630 Street DI319 DI320 250.525 0.017 0.2 2.6 0.1 0.1 STREET 0 0 1 1.64% 3rdStreetC64 Closed-Conduit J3 J4 187.591 0.014 0 0 0.1 0.1 CIRCULAR 1 0 1 0.66%C65 Closed-Conduit J4 J5 108.194 0.014 0 0 0.1 0.1 CIRCULAR 0.83 0 1 1.00%C653 Closed-Conduit I048 DI503 165.758 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.35%C66 Closed-Conduit J5 DI016 499.385 0.014 0 0 0.1 0.1 CIRCULAR 2 0 1 1.06%C67 Closed-Conduit DI277 J6 172.388 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.31%C68 Closed-Conduit J6 J7 176.086 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.57%C69 Closed-Conduit J7 J8 278.021 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 0.36%C7 Street DI190 DI181 738.784 0.017 0.8 2.6 0.1 0.1 STREET 0 0 1 0.95% 101NC70 Closed-Conduit J30 J31 286.455 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 2.47%C70_1 Closed-Conduit J8 J27 16.782 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 1.07%C70_2 Closed-Conduit J27 MH032 281.306 0.013 0 0 0.1 0.1 CIRCULAR 3 0 1 1.07%C71 Closed-Conduit MH067 J7 13.721 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 0.00%C72 Closed-Conduit I138 DI289 35.112 0.014 0 0 0.1 0.1 CIRCULAR 0.75 0 1 -6.76%C73_1 Closed-Conduit J13 MH049 13.942 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 -3.70%C73_2 Closed-Conduit MH051 J13 24.326 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 -3.69%C74_1 Closed-Conduit MH044 MH023 37.603 0.013 0 0 0.1 0.1 CIRCULAR 1.25 0 1 -4.89%C75 Closed-Conduit J9 MH023 210.178 0.013 0 0 0.1 0.1 CIRCULAR 1.33 0 1 0.89%C76 Closed-Conduit J10 J11 33.71 0.013 0 0 0.1 0.1 CIRCULAR 2.5 0 1 0.30% 12 Base Conditions Conduit Summary
Name Tag Inlet Node Outlet Node Length (ft) Roughness
Inlet Offset (ft)
Outlet Offset (ft)
Entry Loss Coeff.
Exit Loss Coeff. Cross-Section
Geom1 (ft)
Geom2 (ft) Barrels
Slope (ft/ft) Street Transect
Left Bank Roughness
Right Bank Roughness
Channel Roughness
C77 Closed-Conduit J11 I039 99.359 0.013 0 0 0.1 0.1 CIRCULAR 2.5 0 1 0.40%C78 Closed-Conduit J16 DI494 63.706 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 0.38%C79 Closed-Conduit MH049 MH045 23.368 0.013 0 0 0.1 0.1 CIRCULAR 3 0 2 0.93%C8 Closed-Conduit DI530 I022 15.849 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 27.37%C80 Closed-Conduit MH047 MH045 5.69 0.013 0 0 0.1 0.1 CIRCULAR 5 0 1 -4.29%C81 Closed-Conduit DI287 DI303 247.856 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.51%C82 Closed-Conduit J22 J23 44.217 0.013 0 0 0.1 0.1 CIRCULAR 1.25 0 1 2.08%C83 Closed-Conduit J25 J26 6.962 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.95%C83_1 Closed-Conduit MH007 J26 117.924 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.88%C83_2 Closed-Conduit J26 J24 173.942 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 1.36%C84 Closed-Conduit I142 J32 14.244 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 -3.32%C85 Closed-Conduit MH030 J34 215.857 0.013 0 0 0.1 0.1 CIRCULAR 3 0 2 0.07%C86 Closed-Conduit J34 MH029 52.573 0.013 0 0 0.1 0.1 CIRCULAR 3 0 2 0.29%C87 Closed-Conduit MH029 J36 44.695 0.013 0 0 0.1 0.1 CIRCULAR 4 0 1 0.34%C88 Closed-Conduit J36 MH028 260.754 0.013 0 0 0.1 0.1 CIRCULAR 4 0 1 0.39%C89 Closed-Conduit DI495 MH040 111.805 0.013 0 0 0.1 0.1 CIRCULAR 1.25 0 1 -1.25%C89_1 Closed-Conduit DI077 J38 52.945 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 1.25%C89_2 Closed-Conduit DI079 J38 29.456 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 7.90%C89_3 Closed-Conduit J38 J69 177.256 0.013 0 0 0.1 0.1 CIRCULAR 1.5 0 1 1.16%C89_4 Closed-Conduit MH059 J40 33.793 0.013 0 0 0.1 0.1 CIRCULAR 4.5 0 1 3.65%C90 Closed-Conduit J42 J41 29.962 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 5.91%C91 Closed-Conduit DI075 J41 52.846 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 2.60%C92 Closed-Conduit MH028 MH063 65.893 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 -2.21%C92_1 Closed-Conduit DI081 J44 62.303 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 2.65%C92_2 Closed-Conduit J44 J43 34.258 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 2.65%C93 Closed-Conduit J48 J47 11.545 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 0.94%C94 Closed-Conduit J47 MH029 61.436 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 2.35%C95 Closed-Conduit J33 J34 7.498 0.013 0 0 0.1 0.1 CIRCULAR 2 0 1 34.61%C96 Closed-Conduit DI028 DI025 301.292 0.022 0 0 0.1 0.1 CIRCULAR 1 0 1 1.54%C97 Closed-Conduit J52 J50 57.568 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 5.22%C98 Closed-Conduit J49 J50 25.253 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 11.97%C99 Closed-Conduit J51 J50 46.987 0.013 0 0 0.1 0.1 CIRCULAR 1 0 1 8.54% 13 Base Conditions Conduit Summary
14 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate DI001 DI 27.048 29.348 2.3 DG9 5959961.516 2528186.888
DI002 DI 26.398 28.298 1.9 DG9 5959980.726 2528150.171
DI003 DI 14.109 16.309 2.2 DG7 5960407.528 2527713.454
DI005 DI 18.996 22.346 3.35 DG7 5960551.715 2527496.886 DI006 DI 18.421 20.621 2.2 DG2 5960458.576 2528170.644
DI007 DI 12.15 14.25 2.1 DG2 5960624.07 2527925.166
DI008 DI 11.681 15.181 3.5 DG2 5960696.845 2527891.75
DI009 DI 12 14.2 2.2 DG2 5960656.138 2527948.33
DI010 DI 11.7 13.4 1.7 DG2 5960643.592 2527882.469
DI011 DI 18.275 19.975 1.7 DG2 5960506.613 2528191.524
DI012 DI 22.991 25.991 3 DG2 5960316.093 2528451.92
DI013 DI 20.085 26.085 6 DG2 5960283.027 2528430.268
DI014 DI 24.932 31.832 6.9 DG2 5960189.443 2528702.05
DI015 DI 29.553 32.353 2.8 DG2 5960120.503 2528671.468
DI016 DI 34.443 36.743 2.3 DG2 5959952.208 2528919.066
DI017 DI 31.07 35.57 4.5 DG2 5960054.657 2528972.841
DI018 DI 12.353 15.053 2.7 DG2 5960829.558 2527621.412
DI019 DI 11.523 14.523 3 DG2 5960785.855 2527758.305
DI020 DI 8.876 12.376 3.5 DG2 5960985.727 2527743.424
DI021 DI 9.518 12.218 2.7 DG2 5960963.789 2527776.112
DI022 DI 31.684 34.584 2.9 DG8 5959399.214 2528217.952
DI023 DI 29.243 32.843 3.6 DG8 5959365.998 2528137.005
DI024 DI 27.091 29.691 2.6 DG9 5959954.875 2527819.183
DI025 DI 27.716 32.116 4.4 DG9 5959822.701 2528109.8
DI026 DI 29.948 32.448 2.5 DG9 5959790.613 2528085.17
DI027 DI 34.28 35.28 1 DG8 5959678.591 2528350.494
DI028 DI 32.345 35.145 2.8 DG8 5959653.867 2528359.32
DI029 DI 33.06 35.26 2.2 DG8 5959621.582 2528336.644
DI030 DI 37.507 40.107 2.6 DG2 5959780.757 2529149.89
DI031 DI 41.18 42.68 1.5 DG6 5958872.218 2528910.772
DI032 DI 46.238 48.938 2.7 DG5 5959402.297 2529979.343
DI033 DI 45.242 50.442 5.2 DG5 5959155.316 2529564.229
DI034 DI 42.926 47.476 4.55 DG5 5958976.141 2529436.774 DI035 DI 43.643 47.943 4.3 DG5 5958942.801 2529414.755
DI036 DI 9.8 12.8 3 DG2 5961050.144 2527836.602
DI037 DI 42.45 47.35 4.9 DG5 5958769.615 2529299.834
DI038 DI 42.427 47.677 5.25 DG5 5958736.044 2529274.245 DI039 DI 42.342 47.142 4.8 DG5 5958568.633 2529154.91
DI040 DI 41.459 47.359 5.9 DG5 5958535.428 2529132.19
DI041 DI 39.953 50.253 10.3 DG5 5958355.253 2529022.711 DI042 DI 39.784 50.484 10.7 DG5 5958322.281 2529000.055 DI043 DI 50.743 52.893 2.15 DG5 5958423.94 2530255.745
DI044 DI 51.291 52.791 1.5 DG5 5958398.383 2530232.922
DI045 DI 50.103 51.953 1.85 DG5 5958010.971 2529980.403 DI046 DI 49.756 52.006 2.25 DG5 5957979.912 2529954.99
DI047 DI 51.791 55.291 3.5 DG5 5957841.47 2529830.405
DI048 DI 53.214 54.764 1.55 DG5 5957839.236 2530724.796 DI049 DI 51.944 54.744 2.8 DG5 5957854.596 2530689.831
DI050 DI 13.274 15.874 2.6 DG2 5960903.887 2528117.352
1 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate DI051 DI 51.868 53.868 2 DG5 5957948.357 2530500.549
DI052 DI 51.4 55.4 4 DG5 5957684.947 2530391.184
DI053 DI 52.49 55.49 3 DG5 5957615.149 2530397.072
DI054 DI 50.07 53.27 3.2 DG5 5957615.301 2531170.966
DI055 DI 56.522 57.022 0.5 DG5 5958033.111 2531222.857
DI056 DI 56.726 57.226 0.5 DG5 5958065.931 2531245.236
DI057 DI 50.938 55.838 4.9 DG5 5958722.97 2531017.372
DI058 DI 49.865 53.965 4.1 DG5 5958857.676 2530795.664
DI059 DI 48.496 52.596 4.1 DG5 5958974.257 2530635.806
DI060 DI 48.109 51.709 3.6 DG5 5959041.506 2530536.885
DI061 DI 47.247 50.547 3.3 DG5 5959225.068 2530256.029
DI062 DI 13.973 16.323 2.35 DG4 5961116.566 2528241.127 DI063 DI 13 15.908 2.908 DG4 5961163.077 2528274.012
DI064 DI 13.435 16.085 2.65 DG4 5961156.343 2528209.074 DI065 DI 10.871 12.971 2.1 DG4 5961287.148 2528016.233
DI066 DI 9.697 12.977 3.28 DG4 5961321.842 2528036.251
DI067 DI 9.606 11.706 2.1 DG4 5961376.564 2527961.151
DI068 DI 9.512 12.512 3 DG4 5961382.661 2527950.927
DI069 DI 7.97 12.97 5 DG4 5961614.968 2528107.252
DI070 DI 15.996 18.646 2.65 DG2 5960737.11 2528365.088
DI071 DI 9.539 11.739 2.2 DG4 5961973.499 2528364.39
DI072 DI 8.571 11.571 3 DG4 5962344.805 2528594.899
DI073 DI 7.988 11.988 4 DG4 5962378.73 2528617.093
DI074 DI 9.029 11.229 2.2 DG4 5962624.043 2528803.559
DI075 DI 8.606 10.506 1.9 DG4 5962929.316 2529010.215
DI076 DI 16.929 19.579 2.65 DG2 5960703.573 2528338.787 DI077 DI 8.659 10.459 1.8 DG4 5963256.832 2529232.406
DI078 DI 7.748 12.448 4.7 DG4 5963022.88 2529167.445
DI079 DI 10.321 11.821 1.5 DG4 5963210.382 2529300.467
DI080 DI 18.193 19.193 1 DG2 5960708.68 2528320.131
DI081 DI 9.64 12.54 2.9 DG4 5962696.187 2528946.521
DI082 DI 9.603 11.353 1.75 DG4 5963029.735 2529534.683
DI083 DI 9.615 11.015 1.4 DG4 5963054.808 2529503.967
DI084 DI 8.086 11.086 3 DG4 5962869.883 2529788.593
DI085 DI 8.021 10.921 2.9 DG4 5962894.311 2529756.487
DI086 DI 8.081 10.831 2.75 DG4 5962959.714 2529800.805
DI087 DI 22.978 24.478 1.5 DG2 5960577.475 2528599.269
DI088 DI 9.837 10.837 1 DG4 5962985.735 2529788.813
DI089 DI 8.882 10.982 2.1 DG3 5963187.227 2530002.329
DI090 DI 9.543 11.543 2 DG3 5963239.678 2530039.652
DI091 DI 7.74 10.84 3.1 DG3 5963228.012 2529966.648
DI092 DI 9.963 11.463 1.5 DG3 5963363.185 2529769.056
DI093 DI 10.27 11.27 1 DG3 5963396.485 2529790.378
DI094 DI 22.914 24.917 2.003 DG2 5960535.951 2528573.332 DI095 DI 7.668 10.986 3.318 DG3 5963404.037 2529710.063 DI096 DI 7.085 10.785 3.7 DG3 5963502.583 2529633.204
DI097 DI 9.997 11.497 1.5 DG3 5963562.159 2529550.533
DI098 DI 8 11 3 DG3 5963519.064 2529534.104
DI099 DI 23.801 25.801 2 DG2 5960837.216 2528777.033
2 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate DI100 DI 8.548 11.548 3 DG3 5963544.937 2529472.81
DI101 DI 8.925 11.525 2.6 DG3 5963598.413 2529494.846
DI102 DI 9.915 10.915 1 DG3 5963673.994 2529497.878
DI103 DI 7.58 10.98 3.4 DG3 5963904.847 2529420.513
DI104 DI 7.219 10.819 3.6 DG3 5963944.831 2529430.748
DI105 DI 6.727 11.027 4.3 DG3 5964221.595 2529406.134
DI106 DI 7.007 10.507 3.5 DG3 5964515.142 2529313.194
DI107 DI 7.259 10.459 3.2 DG3 5964571.424 2529295.826
DI109 DI 8.9 11 2.1 DG3 5964799.911 2529223.652
DI110 DI 9.175 10.375 1.2 DG3 5964765.989 2529331.511
DI111 DI 9.418 10.668 1.25 DG3 5964758.443 2529303.767
DI112 DI 9.616 11.616 2 DG3 5965044.056 2529213.655
DI113 DI 8.902 11.802 2.9 DG3 5965068.163 2529231.114
DI114 DI 9.538 11.868 2.33 DG3 5965214.122 2529186.104
DI115 DI 9.7 12.957 3.257 DG3 5965296.262 2529134.267
DI116 DI 29.328 31.328 2 DG2 5960364.117 2528826.604
DI117 DI 9.812 12.812 3 DG3 5965246.452 2529150.259
DI119 DI 10.1 12.7 2.6 DG3 5965247.934 2529083.179
DI120 DI 10.16 12.49 2.33 DG3 5965247.731 2529055.702
DI121 DI 10.901 12.651 1.75 DG3 5965286.331 2528993.688 DI122 DI 25.197 28.537 3.34 DG2 5960509.794 2528918.127 DI123 DI 10.672 11.672 1 DG3 5963419.136 2529448.709
DI124 DI 8.045 11.045 3 DG3 5963483.87 2529479.938
DI125 DI 8.173 10.973 2.8 DG3 5963436.427 2529530.733
DI126 DI 7.134 10.134 3 DG3 5963765.969 2529774.415
DI127 DI 7.812 10.142 2.33 DG3 5963740.76 2529742.395
DI128 DI 7.296 10.296 3 DG3 5963653.667 2529950.798
DI129 DI 9.272 10.572 1.3 DG3 5963606.163 2529923.895
DI130 DI 9.04 11.64 2.6 DG3 5963141.261 2530165.525
DI131 DI 8.959 11.459 2.5 DG3 5963166.786 2530125.472
DI132 DI 9.14 11.89 2.75 DG3 5963108.556 2530142.934
DI133 DI 11.098 11.098 0 DG3 5963126.603 2530116.403
DI134 DI 10.437 12.937 2.5 DG3 5963024.32 2530267.327
DI135 DI 8.5 12.8 4.3 DG3 5963169.917 2530637.156
DI136 DI 25.197 28.297 3.1 DG2 5960531.936 2528885.497
DI137 DI 8.282 11.482 3.2 DG3 5963128.174 2530686.817
DI138 DI 13.029 14.529 1.5 DG3 5962852.181 2530518.99
DI139 DI 12.752 14.952 2.2 DG3 5962845.626 2530502.537
DI140 DI 10.626 12.126 1.5 DG3 5963087.57 2530778.416
DI141 DI 9.793 12.293 2.5 DG3 5963039.305 2530847.089
DI142 DI 10.277 12.177 1.9 DG3 5963332.506 2530824.898
DI143 DI 9.613 11.113 1.5 DG4 5962929.546 2529953.274
DI144 DI 8.827 10.827 2 DG4 5962892.193 2529927.98
DI145 DI 11.635 13.635 2 DG4 5962759.728 2530024.204
DI146 DI 10.239 13.239 3 DG4 5962698.501 2530034.74
DI147 DI 15.803 17.603 1.8 DG4 5962503.336 2530217.117
DI148 DI 16.954 18.704 1.75 DG4 5962480.523 2530249.596 DI149 DI 18.076 19.076 1 DG4 5962512.71 2530266.466
DI150 DI 19.863 21.113 1.25 DG4 5962389.383 2530205.765 3 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate DI151 DI 20.337 21.837 1.5 DG4 5962359.105 2530180.122
DI152 DI 26.025 27.775 1.75 DG4 5962190.194 2530415.9
DI153 DI 27.605 29.905 2.3 DG2 5960650.464 2529028.658
DI154 DI 24.938 29.138 4.2 DG4 5962155.6 2530552.695
DI155 DI 29.183 31.633 2.45 DG4 5962070.417 2530696.87
DI156 DI 29.672 31.672 2 DG4 5962017.203 2530660.959
DI157 DI 30.802 32.802 2 DG4 5961806.743 2530533.261
DI158 DI 31.029 32.529 1.5 DG4 5961771.982 2530509.268
DI159 DI 28.291 31.491 3.2 DG2 5960470.626 2529205.646
DI160 DI 33.499 35.829 2.33 DG4 5961903.692 2530945.376 DI161 DI 32.899 35.199 2.3 DG4 5961852.944 2530911.393
DI162 DI 38.387 40.887 2.5 DG4 5961222.713 2530860.722
DI163 DI 39.176 41.276 2.1 DG4 5961187.985 2530841.496
DI164 DI 40.121 41.371 1.25 DG4 5961190.689 2530819.767 DI165 DI 42.482 44.152 1.67 DG4 5961029.013 2531076.088 DI166 DI 20.049 21.049 1 DG3 5962390.374 2531284.317
DI167 DI 20.12 21.12 1 DG3 5962352.105 2531261.806
DI168 DI 21.211 23.611 2.4 DG3 5962183.393 2531491.654
DI169 DI 20.558 23.858 3.3 DG3 5962201.861 2531460.657
DI170 DI 34.417 37.117 2.7 DG3 5961975.816 2531282.129
DI171 DI 35.101 37.301 2.2 DG3 5962003.843 2531311.198
DI172 DI 33.929 36.529 2.6 DG3 5961949.157 2531291.423
DI173 DI 33.547 36.947 3.4 DG3 5961917.378 2531316.945
DI174 DI 37.391 39.291 1.9 DG3 5961494.734 2531031.399
DI175 DI 37.459 40.209 2.75 DG3 5961436.929 2530992.05
DI176 DI 17.5 19 1.5 DG3 5961994.749 2531906.499
DI177 DI 20.253 21.253 1 DG3 5961899.6 2531915.19
DI178 DI 28.517 31.317 2.8 DG2 5960449.067 2529235.504
DI179 DI 18.993 22.493 3.5 DG3 5962013.034 2532066.744
DI180 DI 19.676 23.576 3.9 DG3 5962027.487 2532186.559
DI181 DI 19.485 22.235 2.75 DG3 5962092.595 2531998.65
DI182 DI 18.729 21.629 2.9 DG3 5962090.586 2531944.635
DI183 DI 19.688 25.688 6 DG3 5961517.036 2532722.622
DI184 DI 22.198 23.698 1.5 DG3 5961523.156 2532679.279
DI185 DI 33.039 35.539 2.5 DG2 5960281.326 2529487.552
DI186 DI 20.698 23.698 3 DG3 5961789.896 2532676.025
DI187 DI 18.992 23.992 5 DG3 5961789.036 2532727.445
DI188 DI 22.948 24.448 1.5 DG3 5961881.901 2532722.355
DI189 DI 23.766 28.516 4.75 DG3 5962130.134 2532758.349 DI190 DI 28.264 29.264 1 DG3 5962229.239 2532719.174
DI191 DI 26.285 31.085 4.8 DG3 5962200.947 2532970.412
DI193 DI 27.246 32.046 4.8 DG3 5962239.362 2533094.746
DI194 DI 29.16 34.41 5.25 DG3 5962274.985 2533238.926
DI195 DI 29.618 32.618 3 DG3 5962493.326 2533554.522
DI196 DI 29.601 32.601 3 DG3 5962623.638 2533743.09
DI197 DI 30.197 32.697 2.5 DG3 5962680.75 2533824.187
DI198 DI 30.178 32.928 2.75 DG3 5962714.845 2533869.074 DI199 DI 30.323 32.523 2.2 DG3 5962777.792 2533944.025
DI200 DI 30.529 35.129 4.6 DG2 5960332.102 2529521.892
4 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate DI201 DI 30.2 33.012 2.812 DG3 5962727.405 2533965.889
DI202 DI 30.455 33.888 3.433 DG3 5962625.465 2533969.613 DI203 DI 30.655 34.155 3.5 DG3 5962588.408 2533972.704
DI204 DI 33.525 36.625 3.1 DG3 5962325.418 2533976.76
DI205 DI 34.552 38.222 3.67 DG3 5962149.802 2533980.972 DI206 DI 36.885 38.885 2 DG3 5962112.172 2534029.551
DI207 DI 38.641 39.641 1 DG3 5962004.5 2534064.108
DI208 DI 38.971 39.971 1 DG3 5961549.753 2534175.226
DI209 DI 37.667 39.567 1.9 DG2 5960282.286 2529802.766
DI213 DI 26.88 30.38 3.5 DG1 5963274.884 2534436.058
DI214 DI 28.095 31.095 3 DG1 5963210.944 2534385.508
DI215 DI 25.886 27.886 2 DG1 5963793.149 2534878.617
DI216 DI 24.715 28.315 3.6 DG1 5963670.14 2534669.965
DI217 DI 27.936 28.936 1 DG1 5963611.952 2534611.527
DI218 DI 37.931 40.231 2.3 DG2 5960259.124 2529834.79
DI221 DI 34.962 36.462 1.5 DG3 5960828.408 2534037.958
DI222 DI 31.459 35.659 4.2 DG3 5960821.295 2534127.073
DI223 DI 29.407 36.007 6.6 DG3 5960812.413 2534476.218
DI224 DI 30.085 35.835 5.75 DG3 5960851.869 2534475.061 DI225 DI 26.875 32.875 6 DG3 5960552.189 2534486.928
DI226 DI 26.659 32.859 6.2 DG3 5960512.581 2534484.498
DI227 DI 36.891 40.391 3.5 DG2 5960165.269 2529771.673
DI228 DI 37.942 40.442 2.5 DG3 5961085.721 2534689.589
DI229 DI 37.746 40.296 2.55 DG3 5961083.805 2534731.22
DI230 DI 34.93 39.6 4.67 DG3 5960868.467 2534743.588
DI231 DI 34.563 41 6.437 DG3 5960811.247 2534747.386
DI232 DI 35.132 37.882 2.75 DG3 5960552.62 2534743.462
DI233 DI 38.76 40.86 2.1 DG2 5960113.796 2529735.573
DI234 DI 45.812 48.262 2.45 DG3 5960583.864 2535410.081 DI235 DI 45.017 47.617 2.6 DG3 5960520.529 2535408.893
DI236 DI 41.822 47.022 5.2 DG3 5960493.997 2535410.147
DI237 DI 50.858 51.858 1 DG3 5960256.207 2536365.07
DI238 DI 47.472 51.472 4 DG3 5960297.803 2536362.711
DI239 DI 52.666 56.566 3.9 DG3 5960557.152 2536608.036
DI240 DI 52.625 56.625 4 DG3 5960597.391 2536607.638
DI241 DI 49.288 52.888 3.6 DG3 5960830.555 2536665.681
DI242 DI 48.765 51.665 2.9 DG3 5960923.199 2536660.625
DI243 DI 48.314 51.064 2.75 DG3 5961029.3 2536657.646
DI244 DI 49.308 51.108 1.8 DG3 5961041.413 2536707.975
DI245 DI 48.043 51.543 3.5 DG3 5961133.942 2536653.594
DI246 DI 47.864 51.164 3.3 DG3 5961162.791 2536604.627
DI247 DI 46.496 49.696 3.2 DG3 5961158.601 2536411.926
DI248 DI 39.148 44.248 5.1 DG2 5959944.875 2529983.379
DI249 DI 47.738 49.738 2 DG3 5961197.982 2536409.644
DI250 DI 40.005 43.905 3.9 DG2 5959997.744 2530019.764
DI251 DI 52.667 54.967 2.3 DG2 5958897.817 2531428.814
DI252 DI 34.934 40.334 5.4 DG4 5960743.428 2530523.195
DI253 DI 35.006 39.606 4.6 DG4 5960685.629 2530484.095
DI254 DI 37.901 38.901 1 DG4 5960561.71 2530538.058
5 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate DI255 DI 39.437 41.767 2.33 DG4 5960449.492 2530325.039 DI256 DI 35.646 37.796 2.15 DG4 5960611.502 2530088.082 DI257 DI 36.185 37.185 1 DG4 5960644.981 2530108.676
DI258 DI 33.03 36.43 3.4 DG4 5960664.713 2530102.248
DI259 DI 26.088 33.488 7.4 DG4 5960773.776 2530182.162
DI260 DI 31.597 33.747 2.15 DG4 5960790.57 2530146.18
DI261 DI 29 35 6 DG4 5960926.073 2529924.126
DI262 DI 33.13 34.88 1.75 DG4 5960780.276 2529837.821
DI263 DI 28.75 31 2.25 DG4 5960949.516 2529885.894
DI264 DI 41.727 45.027 3.3 DG2 5959724.79 2529863.031
DI265 DI 23.677 27.877 4.2 DG4 5960987.659 2529833.222
DI266 DI 29.214 30.714 1.5 DG4 5961250.439 2529773.031
DI267 DI 26.662 29.262 2.6 DG4 5961186.681 2529742.398
DI268 DI 16.354 22.454 6.1 DG4 5961049.195 2529651.263
DI269 DI 18.026 22.226 4.2 DG4 5961074.815 2529611.147
DI270 DI 20.929 22.429 1.5 DG4 5961071.477 2529596.69
DI271 DI 15.041 22.941 7.9 DG4 5961029.505 2529534.053
DI272 DI 41.657 44.807 3.15 DG2 5959694.487 2529838.076 DI273 DI 17.767 19.767 2 DG4 5961140.697 2529375.955
DI274 DI 16.711 18.711 2 DG4 5961197.553 2529387.979
DI275 DI 18.24 20.24 2 DG4 5961117.843 2529342.694
DI276 DI 18.453 20.453 2 DG4 5961113.15 2529348.407
DI277 DI 15.029 18.929 3.9 DG4 5961214.507 2529352.915
DI278 DI 13.203 18.953 5.75 DG4 5961210.302 2529349.613 DI279 DI 23.248 27.248 4 DG4 5961396.76 2529526.698
DI280 DI 24.036 27.036 3 DG4 5961421.876 2529489.102
DI281 DI 39.256 43.456 4.2 DG2 5960048.735 2530054.461
DI282 DI 13.8 19.081 5.281 DG4 5961249.315 2529214.409
DI283 DI 17.851 20.101 2.25 DG4 5961201.458 2529215.031 DI284 DI 12.301 16.631 4.33 DG4 5961398.664 2529156.107 DI285 DI 11.733 16.883 5.15 DG4 5961419.246 2529123.365 DI286 DI 21.558 23.358 1.8 DG4 5961564.985 2529282.612
DI287 DI 20.494 22.494 2 DG4 5961600.815 2529229.489
DI288 DI 40.945 43.445 2.5 DG2 5960072.4 2530023.391
DI289 DI 22.767 24.427 1.66 DG4 5961664.968 2529336.345 DI290 DI 23.093 24.893 1.8 DG4 5961735.426 2529384.116
DI291 DI 23.821 25.221 1.4 DG4 5961773.289 2529409.633
DI292 DI 24.24 25.24 1 DG4 5961784.18 2529423.342
DI293 DI 29.663 30.913 1.25 DG4 5960944.896 2529242.511 DI294 DI 9.787 13.587 3.8 DG4 5961785.651 2528331.873
DI295 DI 42.951 43.951 1 DG2 5960195.782 2530148.644
DI296 DI 9.354 13.154 3.8 DG4 5961844.961 2528371.809
DI297 DI 11.262 14.712 3.45 DG4 5961615.528 2528579.199 DI298 DI 10.389 14.389 4 DG4 5961639.353 2528547.281
DI299 DI 11.021 13.121 2.1 DG4 5961735.796 2528611.802
DI300 DI 10.352 14.102 3.75 DG4 5961671.666 2528617.189 DI301 DI 14.341 18.341 4 DG4 5961446.99 2528851.885
DI302 DI 13.149 17.399 4.25 DG4 5961501.02 2528863.253
DI303 DI 16.751 19.499 2.748 DG4 5961750.049 2529031.62 6 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate DI305 DI 13.282 14.982 1.7 DG4 5961867.846 2528763.961
DI306 DI 42.207 45.607 3.4 DG2 5959793.774 2530236.175
DI307 DI 12.348 14.898 2.55 DG4 5961916.248 2528781.748 DI308 DI 12.939 15.039 2.1 DG4 5961936.293 2528734.036
DI310 DI 9.687 13.087 3.4 DG4 5962528.651 2528855.5
DI311 DI 9.711 13.211 3.5 DG4 5962562.618 2528879.709
DI312 DI 43.558 46.558 3 DG2 5959787.539 2530244.943
DI313 DI 13.845 14.845 1 DG4 5962361.638 2529063.795
DI314 DI 12.687 14.687 2 DG4 5962322.741 2529037.461
DI315 DI 9.993 11.743 1.75 DG4 5962401.966 2529251.272
DI316 DI 18.187 19.517 1.33 DG4 5961948.801 2529179.276 DI317 DI 17.794 19.544 1.75 DG4 5961944.952 2529162.923 DI318 DI 17.849 19.459 1.61 DG4 5961981.17 2529200.677
DI319 DI 17.953 19.283 1.33 DG4 5961996.767 2529197.648 DI320 DI 11.456 14.206 2.75 DG4 5962197.783 2529347.172 DI321 DI 10.919 14.419 3.5 DG4 5962217.33 2529296.455
DI322 DI 43.235 46.235 3 DG2 5960081.424 2530415.283
DI323 DI 10.75 13.047 2.297 DG4 5962265.668 2529325.083 DI324 DI 11.033 14.033 3 DG4 5962242.639 2529281.276
DI325 DI 11.926 12.926 1 DG4 5962315.72 2529369.583
DI326 DI 9.722 11.87 2.148 DG4 5962444.28 2529464.04
DI327 DI 9.267 10.937 1.67 DG4 5962443.213 2529499.484
DI328 DI 8.56 10.66 2.1 DG4 5962445.657 2529521.568
DI329 DI 9.45 11.55 2.1 DG4 5962316.263 2529595.447
DI330 DI 8.188 10.938 2.75 DG4 5962477.319 2529541.256
DI331 DI 8.56 10.81 2.25 DG4 5962589.767 2529598.941
DI332 DI 10.779 12.779 2 DG4 5962713.547 2529629.152
DI333 DI 43.624 46.424 2.8 DG2 5960033.201 2530416.628
DI334 DI 9.205 11.105 1.9 DG10 5962840.183 2528652.954
DI335 DI 8.898 11.325 2.427 DG10 5962879.895 2528653.906 DI336 DI 8.578 12.2 3.622 DG10 5962961.594 2528718.243
DI337 DI 8.895 12 3.105 DG10 5963040.105 2528715.996
DI338 DI 14.626 17.876 3.25 DG4 5962030.592 2529594.77
DI339 DI 12.629 16.879 4.25 DG4 5962055.737 2529628.369 DI340 DI 12.068 13.668 1.6 DG4 5962271.268 2529771.782
DI341 DI 11.158 13.658 2.5 DG4 5962274.675 2529747.663
DI342 DI 11.611 13.511 1.9 DG4 5962296.613 2529714.67
DI343 DI 10.302 13.202 2.9 DG4 5962329.582 2529784.8
DI344 DI 43.514 47.314 3.8 DG2 5959933.913 2530564.464
DI345 DI 11.507 12.907 1.4 DG4 5962352.792 2529752.209
DI346 DI 19.995 20.995 1 DG4 5962134.432 2529964.137
DI347 DI 19.275 20.275 1 DG4 5962156.398 2529948.049
DI348 DI 17.861 19.861 2 DG4 5962181.458 2529978.987
DI349 DI 18.324 20.324 2 DG4 5962183.314 2530001.261
DI350 DI 18.592 20.842 2.25 DG4 5962109.193 2530011.495 DI351 DI 17.376 20.576 3.2 DG4 5962142.482 2530037.012
DI352 DI 17.666 22.766 5.1 DG4 5961893.373 2529868.926
DI353 DI 45.797 46.797 1 DG2 5959968.552 2530672.557
DI354 DI 18.814 23.264 4.45 DG4 5961860.077 2529847.098 7 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate DI355 DI 21.974 23.304 1.33 DG4 5961856.03 2529828.349
DI356 DI 24.531 26.781 2.25 DG4 5961742.811 2530112.56
DI357 DI 25.111 27.911 2.8 DG4 5961695 2530091.968
DI358 DI 24.286 26.736 2.45 DG4 5961715.066 2530131.976 DI359 DI 44.156 49.156 5 DG2 5959704.278 2530902.715
DI360 DI 46.672 49.472 2.8 DG2 5959736.242 2530925.9
DI361 DI 51.384 53.884 2.5 DG2 5959378.709 2531385.55
DI362 DI 49.875 52.675 2.8 DG2 5959480.908 2531233.402
DI363 DI 51.811 53.911 2.1 DG2 5959220.412 2531472.609
DI364 DI 35.459 37.639 2.18 DG6 5959505.345 2528601.861 DI365 DI 36.32 37.62 1.3 DG6 5959454.494 2528583.817
DI366 DI 33.811 35.911 2.1 DG6 5959257.27 2528434.116
DI367 DI 42.216 44.216 2 DG2 5959617.698 2529414.602
DI368 DI 33.797 34.797 1 DG6 5959183.944 2528404.034
DI369 DI 33.042 34.042 1 DG6 5959185.822 2528364.584
DI370 DI 37.946 38.946 1 DG6 5959064.005 2528611.259
DI371 DI 36.936 39.336 2.4 DG6 5959086.692 2528680.75
DI372 DI 36.46 39.26 2.8 DG6 5959038.607 2528663.44
DI373 DI 41.614 42.814 1.2 DG6 5958917.137 2528928.239
DI374 DI 31.417 32.417 1 DG3 5962328.656 2533023.33
DI488 DI 23.569 24.569 1 DG4 5961184.459 2529664.177
DI489 DI 13.368 14.868 1.5 DG4 5962655.805 2529263.554
DI490 DI 36.256 37.256 1 DG6 5959539.674 2528576.707
DI491 DI 52.2 53.45 1.25 DG2 5959373.37 2531399.789
DI492 DI 51.95 53.2 1.25 DG2 5959380.491 2531388.293
DI494 DI 9.759 12.759 3 DG4 5962584.534 2529464.31
DI495 DI 12.526 15.526 3 DG4 5962237.548 2529106.116
DI496 DI 20.974 23.974 3 DG4 5961706.562 2529302.267
DI498 DI 40.222 41.722 1.5 DG3 5961399.604 2534682.313
DI499 DI 40.695 41.695 1 DG3 5961399.527 2534721.145
DI500 DI 41.86 42.86 1 DG3 5961766.044 2534713.026
DI501 DI 8.908 9.908 1 DG3 5964537.478 2529381.565
DI503 DI 6.091 10.691 4.6 DG3 5963551.526 2529272.164
DI504 DI 13.506 14.506 1 DG4 5962808.483 2529343.118
DI505 DI 10.904 11.904 1 DG4 5962813.214 2529241.619
DI508 DI 15.855 18.355 2.5 DG4 5961240.743 2529319.163
DI509 DI 10.392 11.392 1 DG3 5963389.468 2529791.801
DI511 DI 22.404 25.204 2.8 DG3 5962060.215 2532407.248
DI512 DI 15 21 6 DG3 5961490.817 2532424.913
DI513 DI 16.791 21 4.209 DG3 5961494.216 2532451.252
DI514 DI 30.113 33.013 2.9 DG3 5962740.757 2533965.502
DI515 DI 11.397 13.397 2 DG3 5962900.87 2531038.772
DI516 DI 31.129 32.229 1.1 DG3 5962958.06 2534145.128
DI518 DI 25.063 28.763 3.7 DG1 5963649.858 2534759.186
DI519 DI 8.795 11.095 2.3 DG3 5963267.21 2530009.687
DI520 DI 32.453 35.853 3.4 DG3 5962017.173 2531338.804
DI521 DI 26.087 27.087 1 DG2 5960511.861 2528695.085
DI522 DI 28.201 30.201 2 DG2 5960607.698 2529020.791
DI523 DI 41.717 45.417 3.7 DG2 5959679.4 2529831.017
8 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate DI524 DI 12.705 14.105 1.4 DG2 5960737.074 2527758.134
DI525 DI 9.744 12.944 3.2 DG2 5960580.311 2527837.168
DI526 DI 11.152 14.002 2.85 DG4 5961990.713 2528581.883 DI527 DI 11.037 13.887 2.85 DG4 5962059.154 2528552.713 DI528 DI 10.049 13.749 3.7 DG4 5961839.456 2528324.294
DI529 DI 10.637 13.737 3.1 DG4 5961864.995 2528341.813
DI530 DI 49.726 52.226 2.5 DG5 5958187.139 2530072.754
DI531 DI 49.487 51.887 2.4 DG5 5958234.667 2530104.901
DI532 DI 29.857 34.357 4.5 DG8 5959392.171 2528177.835
DI533 DI 13.133 16.133 3 DG7 5960311.992 2527656.962
DI535 DI 13.394 14.394 1 DG4 5962539.89 2529177.876
DI536 DI 53.215 57.215 4 DG3 5960569.425 2536739.316
DI537 DI 47 50.164 3.164 DG3 5961168.533 2536044.846
DI538 DI 15.568 16.568 1 DG4 5962247.98 2528980.466
I001 Inter 23.5 49 25.5 DG5 5958143.768 2528906.59
I002 Inter 12 17.537 5.537 DG3 5962131.828 2531880.806
I003 Inter 11.59 15 3.41 DG2 5960771.7 2527779.526
I004 Inter 40.906 42.906 2 DG6 5958886.07 2528895.775
I005 Inter 41.1 43.445 2.345 DG6 5958924.233 2528921.37 I009 Inter 4.625 12 7.375 DG3 5964322.801 2529924.783
I010 Inter 42.43 47.413 4.983 DG5 5958755.644 2529286.952 I011 Inter 50.933 52.933 2 DG5 5958447.889 2530226.341
I012 Inter 50.861 52.861 2 DG5 5958417.087 2530205.439
I013 Inter 44.5 52.288 7.788 DG5 5958233.374 2530084.431 I014 Inter 47.624 52.506 4.882 DG5 5958030.837 2529950.71 I015 Inter 48.707 52.449 3.742 DG5 5958000.034 2529930.175 I016 Inter 50.2 53 2.8 DG5 5957972.529 2530465.894
I017 Inter 51.5 58 6.5 DG5 5957638.927 2530391.392
I018 Inter 51.83 58.23 6.4 DG5 5957651.077 2531134.083
I019 Inter 49.2 54.7 5.5 DG5 5958870.037 2530796.368
I020 Inter 48.5 55 6.5 DG5 5958980.118 2530634.709
I021 Inter 46.83 53 6.17 DG5 5959222.193 2530274.415
I022 Inter 45.542 52.33 6.788 DG5 5958194.177 2530058.552 I023 Inter 12.8 15.689 2.889 DG4 5961192.309 2528225.001 I025 Inter 27.5 30.105 2.605 DG2 5960617.655 2529026.419 I026 Inter 8 13.53 5.53 DG4 5961985.103 2528350.532
I027 Inter 7.1 12.35 5.25 DG4 5962635.794 2528790.033
I028 Inter 7.05 11.26 4.21 DG4 5962938.725 2528993.01
I029 Inter 4 11 7 DG4 5963205.281 2529034.404
I030 Inter 4 11 7 DG4 5963214.052 2529045.643
I031 Inter 6.4 10.922 4.522 DG4 5963113.023 2529134.05
I033 Inter 11.09 14.358 3.268 DG4 5962023.32 2528597.933 I034 Inter 12.533 14.133 1.6 DG4 5962689.351 2529233.233 I035 Inter 22 25 3 DG2 5960578.932 2528597.313
I036 Inter 8 14 6 DG4 5962745.743 2529780.785
I038 Inter 10.2 13.823 3.623 DG2 5960848.475 2527692.981 I039 Inter 8.1 11.476 3.376 DG4 5962979.511 2529814.652 I040 Inter 8.1 10.368 2.268 DG4 5963016.479 2529839.96
I041 Inter 9.93 13 3.07 DG3 5963393.145 2529787.919
9 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate I042 Inter 9.93 11.419 1.489 DG3 5963433.031 2529729.935 I043 Inter 9 12 3 DG3 5963500.238 2529631.638
I044 Inter 8.9 10.985 2.085 DG3 5963560.21 2529542.71
I045 Inter 8.01 12 3.99 DG3 5963534.827 2529509.368
I046 Inter 8.87 11.575 2.705 DG3 5963591.095 2529498.927 I047 Inter 8.85 12 3.15 DG3 5963599.219 2529487.204
I048 Inter 8.33 11.33 3 DG3 5963692.967 2529357.939
I049 Inter 1.604 5.604 4 DG3 5963580.048 2529195.156
I050 Inter 29.853 30.853 1 DG2 5960397.102 2528848.58
I051 Inter 8.929 12 3.071 DG3 5964832.37 2529308.469
I052 Inter 8.901 11.963 3.062 DG3 5965052.807 2529234.216 I053 Inter 9.5 13.188 3.688 DG3 5965342.747 2529192.057 I054 Inter 9.6 13.36 3.76 DG3 5965349.99 2529120.141
I055 Inter 10.02 13.679 3.659 DG3 5965352.405 2529102.377 I056 Inter 10.05 13.121 3.071 DG3 5965336.193 2529056.503 I057 Inter 7.5 12.281 4.781 DG3 5964356.11 2529576.326
I058 Inter 7.8 10.673 2.873 DG3 5964354.436 2529441.835 I059 Inter 7.9 9.819 1.919 DG3 5964381.223 2529435.138
I060 Inter 6.958 8.958 2 DG3 5963858.902 2529660.17
I061 Inter 7.3 11.187 3.887 DG3 5963621.305 2529973.963 I062 Inter 26.5 32 5.5 DG2 5960518.221 2528908.513
I063 Inter 9.514 10.514 1 DG3 5963949.013 2529977.606
I064 Inter 7.5 12.497 4.997 DG3 5963293.399 2530447.953 I065 Inter 7.4 12 4.6 DG3 5963382.865 2530323.389
I066 Inter 8.5 12.169 3.669 DG3 5963137.171 2530683.979 I067 Inter 12.944 14.444 1.5 DG3 5962867.047 2530502.196 I068 Inter 10.3 12.4 2.1 DG3 5963078.917 2530771.634
I069 Inter 10.568 12.568 2 DG3 5963039.968 2530831.295
I070 Inter 11.867 12.867 1 DG3 5963072.273 2531281.747
I071 Inter 8.2 11.352 3.152 DG4 5962903.512 2529927.842 I072 Inter 10 15.492 5.492 DG4 5962565.687 2529936.004
I073 Inter 10.6 15.499 4.899 DG4 5962557.899 2529930.506 I074 Inter 14.7 20.73 6.03 DG4 5962415.395 2530155.484
I075 Inter 10.012 12.012 2 DG2 5960916.818 2527745.177
I076 Inter 27.1 29.93 2.83 DG2 5960632.426 2529005.248
I077 Inter 16.5 21.559 5.059 DG4 5962396.505 2530183.184 I078 Inter 18 21.347 3.347 DG4 5962387.758 2530196.062
I079 Inter 24 29.472 5.472 DG4 5962149.756 2530545.495
I080 Inter 27.5 35 7.5 DG4 5962039.262 2530662.304
I081 Inter 28.6 35 6.4 DG4 5962025.824 2530653.4
I082 Inter 29 32.675 3.675 DG4 5961821.748 2530515.11
I083 Inter 32 35.288 3.288 DG4 5961895.622 2530877.227
I084 Inter 38 41.079 3.079 DG4 5961224.446 2530848.06
I085 Inter 41.4 43.897 2.497 DG4 5961036.37 2531072.861 I086 Inter 14.003 15.003 1 DG3 5962463.537 2531334.967
I087 Inter 11 15.5 4.5 DG3 5962424.142 2531609.606
I088 Inter 32.5 36.786 4.286 DG3 5961999.303 2531323.087 I089 Inter 28.7 31.798 3.098 DG2 5960463.393 2529241.62 I090 Inter 32.8 37.093 4.293 DG3 5961965.953 2531300.409 10 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate I091 Inter 33.2 36.589 3.389 DG3 5961951.859 2531290.873 I092 Inter 15 18.6 3.6 DG3 5961771.305 2532051.762
I093 Inter 18 21.757 3.757 DG3 5961923.052 2531942.09
I094 Inter 18.5 28.09 9.59 DG3 5961357.324 2532707.756
I095 Inter 18 25 7 DG3 5961257.483 2532592.424
I096 Inter 18.992 24.579 5.587 DG3 5961790.812 2532720.881 I097 Inter 22 29 7 DG3 5961882.179 2532717.966
I098 Inter 23.6 29 5.4 DG3 5962095.385 2532711.354
I099 Inter 28.395 29.395 1 DG3 5962227.132 2532728.864
I100 Inter 30.5 32.776 2.276 DG3 5962843.545 2534037.109 I101 Inter 36 40.135 4.135 DG3 5961547.962 2534079.099
I102 Inter 24.521 27.521 3 DG1 5963845.704 2534818.61
I103 Inter 15.775 16.775 1 DG1 5963866.098 2534795.078
I104 Inter 17.622 20.122 2.5 DG2 5960497.994 2528178.387 I105 Inter 23.764 27 3.236 DG3 5960404.667 2534488.532
I107 Inter 36.88 39.88 3 DG3 5960870.049 2534731.168
I108 Inter 33 39.895 6.895 DG3 5960814.559 2534731.642
I109 Inter 30 37.907 7.907 DG3 5960557.596 2534735.171
I110 Inter 22.82 40.279 17.459 DG3 5960104.406 2534751.914 I111 Inter 48.209 49.209 1 DG3 5961120.988 2535390.463
I112 Inter 36.425 37.925 1.5 DG3 5960147.714 2535416.172 I113 Inter 45.855 46.855 1 DG3 5961572.176 2535981.107
I114 Inter 46.69 47.69 1 DG3 5961345.964 2535992.356
I115 Inter 47 50 3 DG3 5961343.464 2536038.599
I116 Inter 44 46 2 DG3 5960293.638 2536168.577
I117 Inter 47.5 57.466 9.966 DG3 5960307.801 2536683.492 I118 Inter 48 56.893 8.893 DG3 5960567.757 2536675.994
I120 Inter 38.99 44.156 5.166 DG2 5959960.707 2529989.782 I122 Inter 46.594 52 5.406 DG3 5961162.327 2536409.133
I123 Inter 46 49 3 DG3 5961159.899 2536320.288
I124 Inter 32.454 39.819 7.365 DG4 5960629.769 2530438.172 I125 Inter 39 41.978 2.978 DG4 5960466.112 2530318.096
I126 Inter 34.318 39 4.682 DG4 5960626.443 2530075.938
I127 Inter 40.971 44.971 4 DG2 5959740.737 2529837.672
I128 Inter 33.468 36.868 3.4 DG4 5960654.249 2530095.222 I129 Inter 29.1 35 5.9 DG4 5960922.578 2529929.41
I130 Inter 18.7 28 9.3 DG4 5961096.028 2529668.476
I131 Inter 22 24.584 2.584 DG4 5961158.373 2529667.329
I132 Inter 22.5 27.503 5.003 DG4 5961405.199 2529518.269 I133 Inter 22 26.559 4.559 DG4 5961426.409 2529486.022
I134 Inter 17.985 19.985 2 DG2 5960491.604 2528187.76
I135 Inter 14 19.667 5.667 DG4 5961188.957 2529314.654
I136 Inter 12 17.259 5.259 DG4 5961415.586 2529131.001
I137 Inter 21 23.385 2.385 DG4 5961573.329 2529267.015
I138 Inter 20.4 23.9 3.5 DG4 5961695.304 2529318.664
I139 Inter 23.83 25.179 1.349 DG4 5961788.865 2529415.309 I140 Inter 7.4 13.77 6.37 DG4 5961841.836 2528335.031
I141 Inter 7.2 15 7.8 DG4 5961854.148 2528343.097
I142 Inter 9.8 13.803 4.003 DG4 5961680.127 2528573.424 11 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate I143 Inter 41.047 46.047 5 DG2 5959800.816 2530227.294
I144 Inter 11.3 14.69 3.39 DG4 5961956.834 2528696.272
I146 Inter 13.238 15.238 2 DG4 5962364.805 2529057.882
I147 Inter 13.251 15.251 2 DG4 5962331.73 2529035.677
I149 Inter 11.259 14.959 3.7 DG4 5962308.039 2529153.506 I150 Inter 11 14.074 3.074 DG4 5962326.894 2529218.994
I151 Inter 42 46.714 4.714 DG2 5960054.869 2530397.31
I153 Inter 17.702 19.702 2 DG4 5961959.814 2529167.303
I154 Inter 17.59 19.59 2 DG4 5961989.995 2529187.709
I155 Inter 10.8 12.816 2.016 DG4 5962262.074 2529338.39 I156 Inter 10.75 12.964 2.214 DG4 5962265.09 2529311.251 I157 Inter 10.75 12.388 1.638 DG4 5962315.237 2529372.496 I158 Inter 9.5 11.433 1.933 DG4 5962455.141 2529471.857 I159 Inter 8.25 11.433 3.183 DG4 5962456.347 2529503.98 I160 Inter 42.5 46.759 4.259 DG2 5960042.725 2530415.121 I161 Inter 8.9 11.566 2.666 DG4 5962382.244 2529612.75
I162 Inter 7.7 12.066 4.366 DG4 5962715.408 2529626.361 I163 Inter 43 47.454 4.454 DG2 5959940.607 2530566.18
I164 Inter 12.5 17.292 4.792 DG4 5962062.656 2529614.13 I165 Inter 10.66 15 4.34 DG4 5962337.614 2529778.564
I166 Inter 18 21.085 3.085 DG4 5962152.995 2530016.42
I167 Inter 17 22.639 5.639 DG4 5961893.844 2529863.539
I168 Inter 43.5 47.708 4.208 DG2 5959900.146 2530625.735 I169 Inter 19 25.83 6.83 DG2 5960318.383 2528445.48
I170 Inter 52.338 54.478 2.14 DG2 5959222.523 2531417.65 I171 Inter 24.786 27.786 3 DG9 5959996.059 2527840.806
I172 Inter 22 26.123 4.123 DG9 5960038.165 2527778.241
I173 Inter 26 31.827 5.827 DG9 5959837.061 2528076.739
I174 Inter 26.5 29.368 2.868 DG9 5959973.454 2528166.021 I175 Inter 37.95 39.95 2 DG2 5959795.687 2529154.236
I176 Inter 27.65 31.994 4.344 DG9 5959821.104 2528102.193 I177 Inter 33.5 37.859 4.359 DG6 5959470.169 2528562.747 I178 Inter 32 35.881 3.881 DG6 5959272.237 2528428.665
I179 Inter 29 35.04 6.04 DG6 5959204.4 2528399.652
I180 Inter 24.874 28 3.126 DG2 5960508.748 2528692.765
I181 Inter 22.244 34.244 12 DG6 5959200.225 2528362.08
I182 Inter 35.459 38.459 3 DG6 5959070.896 2528615.235
I183 20 25 5 DG3 5961228.73 2532639.439
I184 17 25.324 8.324 DG3 5961315.989 2532590.765
I185 15 24.602 9.602 DG3 5960301.918 2534332.012
I188 15 22.275 7.275 DG3 5961493.168 2532344.319
I189 9 17 8 DG3 5965334.986 2529257.249
I190 4.996 14 9.004 DG4 5963254.354 2528985.527
I191 20.9 22.9 2 DG9 5960052.484 2527692.104
I192 18 22 4 DG5 5958091.701 2528840.14
I193 3.5 8 4.5 DG2 5961443.576 2527216.784
I536 Inter 59.953 60.953 1 DG3 5960608.585 2536064.844
I707 7.58 10.83 3.25 DG3 5963770.789 2529324.132
I997 8.9 12.198 3.298 DG4 5961378.612 2527958.097
12 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate I999 8.82 10.928 2.108 DG3 5963656.362 2529403.096
J1 10.502 12.602 2.1 DG4 5961337.974 2528014.112
J10 8.6 11.157 2.557 DG4 5963054.437 2529745.338
J107 10.395 17.395 7 DG7 5960239.325 2527604.891
J11 8.5 11.205 2.705 DG4 5963026.19 2529726.938
J13 Inter 7.653 13.418 5.765 DG4 5962895.06 2529414.174 J15 Inter 6.922 12.869 5.947 DG4 5962794.065 2529519.745 J16 DI 10 12.236 2.236 DG4 5962527.37 2529436.189
J17 9.253 11.788 2.535 DG4 5962473.169 2529475.684
J18 MH 8.757 14.117 5.36 DG4 5962563.37 2529350.243
J19 Inter 8.189 12.987 4.798 DG4 5962917.266 2529428.641 J20 DI 8 12.855 4.855 DG4 5962936.69 2529389.846
J21 DI 6.641 13.783 7.142 DG4 5962880.091 2529392.425
J22 16 18.324 2.324 DG4 5961512.741 2529147.485
J23 15.079 17.972 2.893 DG4 5961477.646 2529174.414
J24 23.5 25.837 2.337 DG2 5960794.537 2528747.365
J25 DI 26 27.945 1.945 DG2 5960695.074 2528890.945
J26 25.864 28.075 2.211 DG2 5960701.231 2528894.227
J27 MH 12.321 17.98 5.659 DG4 5961489.692 2528840.716
J28 MH 12.951 17.696 4.745 DG4 5961508.686 2528850.106
J29 DI 22.212 25.118 2.906 DG2 5960609.393 2528618.567
J3 DI 42.029 45.029 3 DG2 5959542.544 2529349.583
J30 MH 23.248 24.67 1.422 DG2 5960565.506 2528591.822
J31 MH 16.175 19.404 3.229 DG2 5960718.603 2528349.735
J32 Inter 10.272 14.456 4.184 DG4 5961669.52 2528563.952 J33 DI 9.452 13.72 4.268 DG4 5962265.703 2528626.448
J34 Inter 7 13.764 6.764 DG4 5962268.858 2528619.646
J36 DI 6.7 13.669 6.969 DG4 5962347.712 2528675.588
J37 MH 11.938 14.299 2.361 DG4 5962201.852 2529336.646
J38 MH 8 11.773 3.773 DG4 5963226.872 2529276.06
J39 DI 6.996 12.631 5.635 DG4 5963024.421 2529253.741
J4 DI 40.799 43.799 3 DG2 5959695.947 2529457.592
J40 MH 5.949 11.844 5.895 DG4 5963072.54 2529171.658
J41 Inter 7.233 12.102 4.869 DG4 5962902.509 2529055.787 J42 DI 9 13.087 4.087 DG4 5962884.874 2529079.98
J43 DI 7.082 11.833 4.751 DG4 5962744.895 2528863.17
J44 DI 7.99 11.935 3.945 DG4 5962727.616 2528892.813
J45 DI 7.06 11.012 3.952 DG4 5962879.084 2528953.116
J46 DI 7.07 11.562 4.492 DG4 5962817.368 2528911.793
J47 MH 8.292 11.95 3.658 DG4 5962354.717 2528613.831
J48 MH 8.4 11.939 3.539 DG4 5962360.999 2528604.117
J49 DI 18 21.416 3.416 DG4 5961017.33 2528537.374
J5 Inter 39.718 42.718 3 DG2 5959698.982 2529349.468
J50 MH 15 21.134 6.134 DG4 5960995.376 2528524.926
J51 DI 19 22.114 3.114 DG4 5960964.438 2528560.264
J52 DI 18 21.228 3.228 DG4 5960947.777 2528492.513
J53 Inter 19.409 21.828 2.419 DG2 5960655.922 2528475.373 J54 DI 19.5 21.627 2.127 DG2 5960659.002 2528476.909
J55 Inter 15.582 18.73 3.148 DG2 5960752.117 2528302.239 13 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate J56 Inter 13.622 18.682 5.06 DG2 5960762.99 2528309.243 J57 Inter 11.664 16.416 4.752 DG2 5960882.048 2528133.255 J58 Inter 13.415 16.673 3.258 DG2 5960874.461 2528128.546 J59 12.532 16.054 3.522 DG2 5960892.944 2528046.912
J6 14.5 20.039 5.539 MH 5961220.666 2529227.16
J60 11.138 16.12 4.982 DG2 5960899.779 2528051.538
J61 DI 0 14.869 14.869 DG4 5961503.855 2528154.573
J62 9.382 13.926 4.544 DG4 5961517.01 2528132.002
J63 DI 11.5 14.164 2.664 DG4 5961393.302 2528083.928
J64 10.067 13.111 3.044 DG4 5961407.554 2528059.975
J65 DI 10.253 12.598 2.345 DG4 5961348.704 2527999.417
J66 DI 11 13.372 2.372 DG4 5961247.536 2527980.826
J67 Inter 10.308 13.303 2.995 DG4 5961258.523 2527965.142 J68 MH 9.7 14.26 4.56 DG2 5961044.538 2527845.616
J69 MH 5.949 11.771 5.822 DG4 5963080.072 2529176.709
J7 13.5 21.288 7.788 MH 5961320.482 2529082.095
J8 12.5 17.678 5.178 MH 5961480.188 2528854.514
J9 DI 10.352 13.352 3 DG4 5962605.284 2529814.08
MH001 MH 11.476 16.476 5 DG2 5960893.486 2528116.282
MH002 MH 14.165 19.165 5 DG2 5960730 2528357.986
MH003 MH 5.692 12.192 6.5 DG4 5961377.929 2527954.383
MH004 MH 9.857 12.857 3 DG4 5961866.187 2528287.866
MH005 MH 7.2 12.9 5.7 DG4 5961869.143 2528283.645
MH006 MH 25.901 30.901 5 DG2 5960399.001 2528842.064
MH007 MH 26.899 29.899 3 DG2 5960637.972 2528993.662
MH008 MH 27.692 31.692 4 DG2 5960481.105 2529211.717
MH009 MH 9 12.512 3.512 DG4 5961582.347 2528096.858
MH010 MH 37.787 40.787 3 DG2 5960124.731 2529743.655
MH011 MH 6.955 13.155 6.2 DG4 5961813.496 2528353.39
MH012 MH 7.43 13.63 6.2 DG4 5961828.987 2528337.354
MH013 MH 14.136 17.336 3.2 DG7 5960414.778 2527700.373
MH014 MH 14.215 17.515 3.3 DG7 5960418.433 2527695.536
MH015 MH 10.583 14.583 4 DG2 5960832.154 2527686.346
MH016 MH 34.076 39.276 5.2 DG6 5959046.349 2528654.928
MH017 MH 30.064 35.264 5.2 DG6 5959202.545 2528415.855
MH018 MH 34.082 38.082 4 DG6 5959498.968 2528589.692
MH019 MH 24.113 27.113 3 DG4 5961731.379 2530106.226
MH020 MH 10.675 13.675 3 DG4 5962282.515 2529744.952
MH021 MH 12.33 17.33 5 DG4 5962067.545 2529607.92
MH022 MH 7.015 12.315 5.3 DG4 5962748.738 2529586.577
MH023 MH 8.476 12.376 3.9 DG4 5962716.548 2529635.764
MH024 MH 6.953 11.553 4.6 DG4 5962527.873 2529510.905
MH025 MH 7.686 11.886 4.2 DG4 5962501.414 2529505.783
MH026 MH 8.379 11.779 3.4 DG4 5962468.477 2529482.18
MH027 MH 13.097 14.897 1.8 DG4 5962391.567 2529081.058
MH028 MH 5.693 13.193 7.5 DG4 5962561.687 2528824.647
MH029 MH 6.85 13.787 6.937 DG4 5962308.443 2528654.244
MH030 MH 7.154 14.054 6.9 DG4 5962084.026 2528508.144
MH031 MH 11.315 15.565 4.25 DG4 5961923.18 2528746.578
14 Base Conditions Junction Summary
Name Description Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Tag X-Coordinate Y-Coordinate MH032 MH 9.32 14.72 5.4 DG4 5961649.024 2528608.847
MH033 MH 10.2 14.78 4.58 DG4 5961661.796 2528575.215
MH034 MH 20.212 23.212 3 DG4 5961581.124 2529246.722
MH035 MH 32.785 35.785 3 DG2 5960293.349 2529494.248
MH036 MH 30.849 34.249 3.4 DG4 5961563.29 2530347.563
MH037 MH 29.724 32.724 3 DG4 5961785.964 2530496.039
MH038 MH 27.163 32.163 5 DG4 5962054.778 2530678.345
MH039 MH 21.749 27.549 5.8 DG4 5962227.463 2530432.013
MH040 MH 13.92 15.42 1.5 DG4 5962300.05 2529013.441
MH041 MH 12.579 14.079 1.5 DG4 5962506.057 2528907.132
MH042 MH 18.093 21.993 3.9 DG4 5961063.958 2529617.209
MH044 MH 6.641 11.641 5 DG4 5962746.011 2529659.131
MH045 MH 7.95 13.066 5.116 DG4 5962914.362 2529399.838
MH046 MH 8.168 11.168 3 DG3 5963215.935 2529983.803
MH047 MH 7.706 13.006 5.3 DG4 5962919.43 2529402.407
MH048 MH 6.948 11.948 5 DG4 5962699.102 2529735.001
MH049 MH 8.168 13.168 5 DG4 5962906.68 2529421.88
MH050 MH 8.47 11.47 3 DG4 5963061.752 2529520.484
MH051 MH 6.755 13.855 7.1 DG4 5962874.785 2529400.73
MH052 MH 5.808 13.608 7.8 DG4 5962918.807 2529331.577
MH053 DI 8.7 17 8.3 DG4 5962987.863 2529229.883
MH054 MH 8.739 11.739 3 DG4 5962786.212 2529084.871
MH055 MH 6.254 12.754 6.5 DG4 5962713.413 2528927.04
MH057 MH 7.263 12.463 5.2 DG4 5962817.177 2528997.135
MH058 MH 6.557 12.557 6 DG4 5963058.499 2529190.98
MH059 MH 7.183 11.883 4.7 DG4 5963044.304 2529153.093
MH061 MH 5.46 11.46 6 DG4 5963116.793 2529125.881
MH062 MH 4.25 11.25 7 DG4 5963109.476 2529120.72
MH063 MH 7.15 12.4 5.25 DG4 5962598.257 2528769.862
MH064 MH 6.82 12.32 5.5 DG4 5962584.406 2528761.1
MH065 MH 9.109 12.609 3.5 DG4 5961607.772 2528112.825
MH066 MH 7.373 12.873 5.5 DG4 5962086.814 2528428.222
MH067 MH 13.5 18.59 5.09 DG4 5961332.272 2529089.118
MH068 MH 7.142 13.342 6.2 DG4 5961822.615 2528351.006
MH069 MH 45.268 52.268 7 DG5 5958206.627 2530117.177
MH070 MH 46.07 51.834 5.764 DG5 5959082.327 2529754.405 15 Base Condition Outfalls
Name Invert Elev. (ft) Rim Elev. (ft) Type
OF1 12.00 14.17 NORMAL
OF2 3.00 8.00 TIDAL
OF3 0.00 4.00 TIDAL
OF4 4.60 10.00 TIDAL
OF5 14.00 18.00 TIDAL
OF6 8.00 12.00 TIDAL
OF7 9.66 17.66 TIDAL
OF8 13.17 17.17 TIDAL
OF9 6.12 22.00 TIDAL
OF10 2.49 4.49 TIDAL
1 GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 138 Attachment 6
Storage Curves
Storage Curves
Name Invert Elev. (ft) Rim Elev. (ft) Depth (ft) Curve Name CreekStorage 22.81 25.91 3.09 SU4
I186 6.88 17.00 10.12 SP30
J2 14.32 20.03 5.71 J2
SP1 15.00 22.00 7.00 SP1
SP4 12.00 17.53 5.53 SP4
SP7 7.40 10.29 2.89 SP7
1 GHD | City Of Crescent City | 12588710 | Crescent City Storm Drain Master Plan 139 ghd.com The Power of Commitment
Technical Memorandum
This Technical Memorandum is provided as an interim output under our agreement with City Of Crescent City. It is provided to foster discussion in relation to technical matters associated with the project and should not be relied upon in any way.
The Power of Commitment
12588710 1
April 28, 2026
To Eric Wier, PE Contact No. (707)267-2238
Copy to David Yeager Email [email protected]
From Patrick Sullivan Project No. 12588710
Project Name Crescent City Storm Drain Master Plan
Subject Extreme Event October 13, 2025, Analysis
1. Introduction
On October 13th, 2025, Crescent City was impacted by an extreme weather event that tested the capacity and resilience of its storm drain infrastructure. This event highlighted vulnerabilities within the existing system and underscored the importance of ongoing assessment and planning to mitigate future risks.
1.1 Purpose of this Memorandum
The purpose of this memorandum is to evaluate the Crescent City October 13th, 2025, extreme rainfall event to determine the recurrence interval and evaluate the performance of City’s storm drain system under existing, base, and proposed conditions (as outlined the City’s Storm Drain Master Plan).
1.2 Scope and limitations
This technical memorandum has been prepared by GHD for City Of Crescent City. It is not prepared as, and is not represented to be, a deliverable suitable for reliance by any person for any purpose. It is not intended for circulation or incorporation into other documents. The matters discussed in this memorandum are limited to those specifically detailed in the memorandum and are subject to any limitations or assumptions specially set out.
2. Extreme Event Recurrence Interval
The Crescent City extreme rainfall event on October 13th, 2025, commenced at approximately 2:30 AM. The most severe precipitation occurred between 3:00 AM and 5:30 AM, placing considerable stress on the stormwater drainage infrastructure. Precipitation persisted at lower intensity until about 8:00 AM. This event resulted in immediate flooding throughout downtown Crescent City. Resident observations indicated that the heaviest rainfall was highly localized to the downtown area, with markedly reduced intensity just a few miles away. According to data from the National Oceanic and Atmospheric Administration (NOAA) weather station at Jack McNamara Field, located roughly two miles from downtown, 1.68 inches of rain were recorded on October 13th, 2025.
12588710 2
To supplement this information, the City collected additional rainfall data via Weather Underground, a commercial service providing real-time, hyper-local weather reports based on a network of personal weather stations (PWS). Data from Station KCACRESC155 at 1405 Harrold St., Crescent City, recorded rainfall at fiveminute intervals, totalling 2.89 inches for the event. A graph depicting rainfall intensity and cumulative accumulation is presented in Figure 1; the blue line represents rainfall intensity while the orange line indicates total accumulation. Analysis of this plot shows that 96% of the total precipitation occurred within a three-hour window, with 100% falling within six hours.
Figure 1 Rainfall Intensity and Cumulative Plot, Crescent City October 13, 2025 The return period, or recurrence interval, measures how often a specific rainfall event occurs on average, calculated using historical rainfall data. NOAA’s Precipitation-Frequency Atlas offers location-specific precipitation frequency estimates for different intervals and storm durations. For Crescent City, 2-hour, 3-hour and 6-hour precipitation frequency values were used to estimate the return period of a recent rain event.
Precipitation frequency plots (Figure 2, Figure 3, and Figure 4) display the estimate along with 90% confidence intervals; the return period is found where the observed rainfall crosses these plots. Based on the rainfall data presented in Figure 1 and NOAA data, the estimated return period for the October 13, 2025, Crescent City storm was 210 years for the 2-hour event, 87 years for a 3-hour event, and 7 years for a 6-hour event. 12588710 3
Table 1 Return Period Estimates for October 13, 2025, Storm Event Storm Duration Precipitation
(in)
Return Period
(yr)
Lower 90%
Confidence (yr)
Upper 90%
Confidence (yr)
2-hr 2.57 210 48 --
3-hr 2.79 87 25 --
6-hr 2.89 7 4 20
Figure 2 NOAA 2-hr Precipitation Frequency Estimate for Crescent City 12588710 4
Figure 3 NOAA 3-hr Precipitation Frequency Estimate for Crescent City Figure 4 NOAA 6-hr Precipitation Frequency Estimate for Crescent City 12588710 5
3. Flooding Assessment
Crescent City is in the process of developing Storm Drain Master Plan (SDMP), which is a document that analyzes a City's existing stormwater infrastructure to identify flooding risks, assess pipe conditions, and plan for future capacity needs. It serves as a roadmap for identifying deficiencies, prioritizing repairs, upgrading systems to meet regulatory standards, and directing capital improvement projects. As part of this process a computation stormwater model, PC-SWMM, was developed. The model simulates stormwater runoff and movement through the City and the City’s storm drain system. The stormwater model simulates selected rainfall events with various return periods (2-yr 24-hr, 10-yr 24-hr, and 50-yr 24-hr) and stormwater flow through drainage infrastructure (pipes, ditches, culverts) and over the ground surface. It quantifies stormwater flow, volume, velocity, and flooding/inundation extents. It is used to identify deficiencies in the existing system and assess potential improvement projects. Several different storm drain model scenarios were developed:
• Existing conditions – this model scenario represents the storm drain system at the time of the extreme rainfall event
• Base conditions – this model scenario is similar to the existing conditions model, but it includes several storm drain improvement projects that are already design and construction scheduled. This scenario was used in the SDMP as the base condition for deficiency analysis and comparison assessment of proposed projects
• Proposed conditions – this model scenario simulates the proposed drainage improvement projects that are recommended in the SDMP
The model development and parameterization process is extensively documented the City’s Storm Drain Master Plan (GHD 2023) and included in Appendix A.
The assessment of the October 13th extreme event uses the model scenarios to quantify and compare the resulting flooding under each scenario. The model will use the observed rainfall pattern, shown in Figure 1, and observed tidal conditions to access each scenario. The tide data was obtained from NOAA Tides and Currents (Crescent City, CA 9419750) for October 13, 2025, and is shown graphically in Figure 5.
Figure 5 Crescent City (9419750) Tides October 13, 2025 The flooding impacts are evaluated by updating model scenarios to simulate rainfall and tides on October 13, 2025. The extents of flooding under existing conditions are used to identify key locations. Flooding volumes under each scenario are calculated and volumes are compared across scenarios to assess differences. 12588710 6
3.1 Key Flooding Locations
The city staff indicated two regions where flooding damage occurred or was documented. These regions were identified as Key flooding locations and are shown in Figure 6. The western location encompassed flooding from 4th St. to 7th St. between C St. and G St. The eastern location encompassed flooding from Front St. to 4th St. between H St. and N St.
Figure 6 Key Flooding Locations, Extreme Event October 13, 2025
3.2 Flooding Volume Estimates
The three modeling scenarios were run with the rainfall and tidal conditions for October 13, 2025. The resulting flooding within the key locations was calculated and presented in Table 2. There were minimal differences between the existing and base condition models.
Table 2 Model Scenario Flooding Summary
Model Scenario Flooding Volume
West (MG)
Flooding Volume
East (MG)
Flooding Volume
Total (MG)
Flooding Difference
(MG)
Existing Conditions 1.687 1.924 3.611 --
Base Conditions 1.687 1.929 3.616 0.005
Proposed Conditions 0.132 0.455 0.587 3.024
The proposed condition model demonstrated considerable improvement over the existing and base conditions.
The proposed condition modeled flooding extents are shown in Figure 7. 12588710 7
Figure 7 Proposed Condition Scenario Flooding with Extreme Event Rainfall and Tides
4. Conclusion
This memorandum summarises an analysis of the Crescent City extreme rain event that occurred on 13/10/2025. An evaluation of the available precipitation data revealed a significant discrepancy in rainfall intensity across the region. Several rain gauges near Crescent City were assessed, and precipitation amounts varied considerably, which suggests that a small but intense rainstorm struck the city. A privately owned weather station recorded rainfall data at five-minute intervals, indicating that 2.89 inches of rain fell in less than six hours, with 2.7 inches occurring within three hours. This observation confirms that the storm was a threehour event, and therefore the six-hour return period estimate is not representative of this occurrence. NOAA precipitation frequency predictions for Crescent City were used to estimate the return period, resulting in an 87- year return period. However, the upper and lower confidence intervals were inconclusive, due to the limited period of record for high intensity three-hour storm events. However, within the 3-hour period there was a higher intensity 2-hour period with 2.57 inches of rain fell. The return period for the 2-hour period was 210 years. This estimate was also inconclusive, due to the limited period of record.
Hydrologic modelling was performed using rainfall data from local gauges to simulate runoff and assess storm drain performance under both existing and proposed conditions. The effects of the high intensity rainfall event were used to evaluate flooding associated with the City’s existing storm drain system and the proposed conditions recommended in the City’s SDMP. There was minimal difference in flooding between the current storm drain system and the base conditions that include scheduled improvements. Performance under the proposed SDMP improvements indicated substantial enhancements in storm drain system effectiveness.
CITY COUNCIL AGENDA REPORT
TO: MAYOR WRIGHT AND MEMBERS OF THE CITY COUNCIL
FROM: ERIC WIER, CITY MANAGER
BY: ROBIN ALTMAN, CITY CLERK/ADMINISTRATIVE ANALYST
DATE: JUNE 15, 2026
SUBJECT: AD HOC COMMITTEE APPOINTMENTS
______________________________________________________________________
RECOMMENDATION
• Hear staff report
• Technical questions from the Council
• Receive public comment
• Further Council discussion
• Mayor to appoint and Council to confirm the appointment of two Council Members to each of the following ad hoc committees: the Lighthouse Cove RV Park ad hoc committee, the Fred Endert Municipal Pool ad hoc committee, Planning Fees ad hoc committee, and Beachfront Park ad hoc committee
BACKGROUND
The City is preparing to make updates to the Master Fee Schedule. As part of that update, staff recommend reviewing current fees and adding new fees for new facilities. Council input will be helpful in that process. When establishing committees, the process is for the Mayor to appoint and the Council to confirm those appointments.
ANALYSIS
Staff recommend the creation of the following ad hoc committees:
• Lighthouse Cove RV Park: recommend rental fees (incl. new cabins / apartment) • Fred Endert Municipal Pool: recommend facility use and rental fees • Planning Fees: recommendation on fees for planning department (permits, etc.) • Beachfront Park: recommendation on facility use fees at park These ad hoc committees will make recommendations on appropriate fees, which will be brought back to the Council in the revised master fee schedule.
ATTACHMENTS - None