Agenda packet — Cathedral City City Council, May 8, 2024 (part 8 of 11)

3746740 3746690 3746640 3746590 3746540 3746490 3746440 3746740 3746690 3746640 3746590 3746540 3746490 3746440 547420 547470 547520 547570 547620 547670 547720 547770 547820 547870 547920 547470 547520 547570 547620 547670 547720 547770 547820 547870 547920 33° 51' 36'' N
116° 29' 14'' W
33° 51' 36'' N
116° 28' 54'' W
33° 51' 25'' N
116° 29' 14'' W
33° 51' 25'' N
116° 28' 54'' W
N
0 100 200 400 600
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 11N WGS84 Feet
0 30 60 120 180
Meters
Map Scale: 1:2,310 if printed on A landscape (11" x 8.5") sheet.

Soil Map may not be valid at this scale.

MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.

Warning: Soil Map may not be valid at this scale.

Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale.

Please rely on the bar scale on each map sheet for map
measurements.

Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:

Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required.

This product is generated from the USDA-NRCS certified data as of the version date(s) listed below.

Soil Survey Area: Riverside County, Coachella Valley Area, California
Survey Area Data: Version 14, Sep 1, 2022
Soil map units are labeled (as space allows) for map scales 1:50,000 or larger.

Date(s) aerial images were photographed: Mar 15, 2022—May 28, 2022
The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident.

Soil Map—Riverside County, Coachella Valley Area, California (TTM 38709 & 38710-VERANO)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 2 of 3 ends

Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI CdC Carsitas gravelly sand, 0 to 9
percent slopes

13.0 94.5%
ChC Carsitas cobbly sand, 2 to 9
percent slopes

0.8 5.5%
Totals for Area of Interest 13.8 100.0%
Soil Map—Riverside County, Coachella Valley Area, California TTM 38709 & 38710-VERANO Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 3 of 3 ends

Riverside County, Coachella Valley Area, California
ChC—Carsitas cobbly sand, 2 to 9 percent slopes
Map Unit Setting
National map unit symbol: hkv3
Elevation: 800 feet
Mean annual precipitation: 4 inches
Mean annual air temperature: 72 to 73 degrees F
Frost-free period: 300 days
Farmland classification: Not prime farmland
Map Unit Composition
Carsitas and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.

Description of Carsitas
Setting
Landform: Alluvial fans
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Gravelly alluvium derived from granite Typical profile
H1 - 0 to 10 inches: cobbly sand
H2 - 10 to 60 inches: gravelly sand
Properties and qualities
Slope: 2 to 9 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Excessively drained
Runoff class: Very low
Capacity of the most limiting layer to transmit water (Ksat): High to very high (5.95 to 19.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 1 percent
Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm)
Available water supply, 0 to 60 inches: Very low (about 3.0 inches) Interpretive groups
Land capability classification (irrigated): 6s
Land capability classification (nonirrigated): 7e
Hydrologic Soil Group: A
Ecological site: R040XD200CA - Rarely Flooded Fans
Map Unit Description: Carsitas cobbly sand, 2 to 9 percent slopes---Riverside County, Coachella Valley Area, California
TTM 38709 & 38710-VERANO
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 1 of 2 ends

Hydric soil rating: No
Minor Components
Chuckawalla
Percent of map unit: 4 percent
Hydric soil rating: No
Riverwash
Percent of map unit: 4 percent
Landform: Channels
Hydric soil rating: Yes
Carrizo
Percent of map unit: 4 percent
Hydric soil rating: No
Unnamed
Percent of map unit: 3 percent
Hydric soil rating: No
Data Source Information
Soil Survey Area: Riverside County, Coachella Valley Area, California Survey Area Data: Version 14, Sep 1, 2022
Map Unit Description: Carsitas cobbly sand, 2 to 9 percent slopes---Riverside County, Coachella Valley Area, California
TTM 38709 & 38710-VERANO
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 2 of 2 ends

Riverside County, Coachella Valley Area, California
CdC—Carsitas gravelly sand, 0 to 9 percent slopes
Map Unit Setting
National map unit symbol: hkv0
Elevation: 800 feet
Mean annual precipitation: 4 inches
Mean annual air temperature: 72 to 73 degrees F
Frost-free period: 275 to 325 days
Farmland classification: Not prime farmland
Map Unit Composition
Carsitas and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.

Description of Carsitas
Setting
Landform: Alluvial fans
Landform position (two-dimensional): Footslope
Landform position (three-dimensional): Tread
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Gravelly alluvium derived from granite Typical profile
H1 - 0 to 10 inches: gravelly sand
H2 - 10 to 60 inches: gravelly sand
Properties and qualities
Slope: 0 to 9 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Excessively drained
Runoff class: Very low
Capacity of the most limiting layer to transmit water (Ksat): High to very high (5.95 to 19.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 1 percent
Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm)
Available water supply, 0 to 60 inches: Very low (about 3.0 inches) Interpretive groups
Land capability classification (irrigated): 4s
Land capability classification (nonirrigated): 7e
Hydrologic Soil Group: A
Ecological site: R040XD200CA - Rarely Flooded Fans
Map Unit Description: Carsitas gravelly sand, 0 to 9 percent slopes---Riverside County, Coachella Valley Area, California
TTM 38709 & 38710-VERANO
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 1 of 2 ends

Hydric soil rating: No
Minor Components
Myoma
Percent of map unit: 4 percent
Hydric soil rating: No
Riverwash
Percent of map unit: 4 percent
Landform: Channels
Hydric soil rating: Yes
Carsitas
Percent of map unit: 4 percent
Hydric soil rating: No
Unnamed, stony or gravelly
Percent of map unit: 3 percent
Hydric soil rating: No
Data Source Information
Soil Survey Area: Riverside County, Coachella Valley Area, California Survey Area Data: Version 14, Sep 1, 2022
Map Unit Description: Carsitas gravelly sand, 0 to 9 percent slopes---Riverside County, Coachella Valley Area, California
TTM 38709 & 38710-VERANO
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 2 of 2 ends

APPENDIX 4

HYDRAFLOW UNIT HYDROGRAPH CALCULATIONS
STORAGE REQUIREMENT, 100YR-24HR
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 6
EX. RETENTION BASIN, D
Hydrograph type = Reservoir Peak discharge = 3.455 cfs
Storm frequency = 100 yrs Time to peak = 13.23 hrs
Time interval = 2 min Hyd. volume = 95,117 cuft
Inflow hyd. No. = 5 - 4090-01 POST DEVT OVERALL UH Max. Elevation = 430.78 ft Reservoir name = EX. RETENTION BASIN,D Max. Storage = 41,437 cuft Storage Indication method used. Outflow includes exfiltration. 1 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28
Q (cfs)

0.00 0.00

3.00 3.00

6.00 6.00

9.00 9.00

12.00 12.00

15.00 15.00

18.00 18.00
Q (cfs)
Time (hrs)
EX. RETENTION BASIN, D
Hyd. No. 6 -- 100 Year
Hyd No. 6 Hyd No. 5 Total storage used = 41,437 cuft
Pond Report 2
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Pond No. 1 - EX. RETENTION BASIN,D
Pond Data
Contours -User-defined contour areas. Conic method used for volume calculation. Begining Elevation = 447.00 ft Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft)

0.00 427.00 3,099 0 0

1.00 428.00 8,720 5,672 5,672

2.00 429.00 11,734 10,189 15,861

3.00 430.00 14,542 13,112 28,973

4.00 431.00 17,286 15,893 44,865

5.00 432.00 20,237 18,740 63,605

6.00 433.00 23,479 21,836 85,441
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [PrfRsr] [A] [B] [C] [D]
Rise (in) = 0.00 0.00 0.00 0.00
Span (in) = 0.00 0.00 0.00 0.00
No. Barrels = 1 0 0 0
Invert El. (ft) = 447.00 0.00 0.00 0.00
Length (ft) = 0.00 0.00 0.00 0.00
Slope (%) = 0.00 0.00 0.00 n/a
N-Value = .013 .013 .013 n/a
Orifice Coeff. = 0.60 0.60 0.60 0.60
Multi-Stage = n/a No No No
Crest Len (ft) = 0.00 0.00 0.00 0.00
Crest El. (ft) = 0.00 0.00 0.00 0.00
Weir Coeff. = 3.33 3.33 3.33 3.33
Weir Type = --- --- --- ---
Multi-Stage = No No No No
Exfil.(in/hr) = 8.940 (by Contour)
TW Elev. (ft) = 0.00
Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s).

0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00
Stage (ft)

0.00 427.00

1.00 428.00

2.00 429.00

3.00 430.00

4.00 431.00

5.00 432.00

6.00 433.00
Elev (ft)
Discharge (cfs)
Stage / Discharge
Total Q
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38709 & 38710\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
1 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 6
EX. RETENTION BASIN, D
Hydrograph type = Reservoir Peak discharge = 3.455 cfs
Storm frequency = 100 yrs Time to peak = 13.23 hrs
Time interval = 2 min Hyd. volume = 95,117 cuft
Inflow hyd. No. = 5 - 4090-01 POST DEVT OVERALL UH Reservoir name = EX. RETENTION BAS Max. Elevation = 430.78 ft Max. Storage = 41,437 cuft
Storage Indication method used. Outflow includes exfiltration.

Hydrograph Discharge Table ( Printed values >= 1.00% of Qp.) Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

10.03 0.114 427.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.037 0.037

10.07 0.120 427.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.040 0.040

10.10 0.127 427.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.043 0.043

10.13 0.134 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.047 0.047

10.17 0.141 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.050 0.050

10.20 0.149 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.054 0.054

10.23 0.156 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.057 0.057

10.27 0.164 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.061 0.061

10.30 0.173 427.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.065 0.065

10.33 0.181 427.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.069 0.069

10.37 0.190 427.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.074 0.074

10.40 0.199 427.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.078 0.078

10.43 0.209 427.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.083 0.083

10.47 0.219 427.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.088 0.088

10.50 0.229 427.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.093 0.093

10.53 0.240 427.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.098 0.098

10.57 0.251 427.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.104 0.104

10.60 0.263 427.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.110 0.110

10.63 0.275 427.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.116 0.116

10.67 0.288 427.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.122 0.122 Continues on next page...
2 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

10.70 0.301 427.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.128 0.128

10.73 0.315 427.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.135 0.135

10.77 0.329 427.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.142 0.142

10.80 0.344 427.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.149 0.149

10.83 0.360 427.09 ----- ----- ----- ----- ----- ----- ----- ----- 0.157 0.157

10.87 0.376 427.09 ----- ----- ----- ----- ----- ----- ----- ----- 0.165 0.165

10.90 0.393 427.10 ----- ----- ----- ----- ----- ----- ----- ----- 0.173 0.173

10.93 0.410 427.10 ----- ----- ----- ----- ----- ----- ----- ----- 0.182 0.182

10.97 0.429 427.11 ----- ----- ----- ----- ----- ----- ----- ----- 0.190 0.190

11.00 0.448 427.11 ----- ----- ----- ----- ----- ----- ----- ----- 0.200 0.200

11.03 0.468 427.12 ----- ----- ----- ----- ----- ----- ----- ----- 0.209 0.209

11.07 0.489 427.12 ----- ----- ----- ----- ----- ----- ----- ----- 0.219 0.219

11.10 0.511 427.13 ----- ----- ----- ----- ----- ----- ----- ----- 0.230 0.230

11.13 0.534 427.13 ----- ----- ----- ----- ----- ----- ----- ----- 0.241 0.241

11.17 0.558 427.14 ----- ----- ----- ----- ----- ----- ----- ----- 0.252 0.252

11.20 0.584 427.15 ----- ----- ----- ----- ----- ----- ----- ----- 0.264 0.264

11.23 0.611 427.15 ----- ----- ----- ----- ----- ----- ----- ----- 0.277 0.277

11.27 0.640 427.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.290 0.290

11.30 0.671 427.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.304 0.304

11.33 0.703 427.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.318 0.318

11.37 0.738 427.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.333 0.333

11.40 0.774 427.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.349 0.349

11.43 0.813 427.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.365 0.366

11.47 0.854 427.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.383 0.383

11.50 0.898 427.22 ----- ----- ----- ----- ----- ----- ----- ----- 0.402 0.401

11.53 0.946 427.23 ----- ----- ----- ----- ----- ----- ----- ----- 0.421 0.421

11.57 1.004 427.24 ----- ----- ----- ----- ----- ----- ----- ----- 0.442 0.442

11.60 1.076 427.26 ----- ----- ----- ----- ----- ----- ----- ----- 0.464 0.464 Continues on next page...
3 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

11.63 1.168 427.27 ----- ----- ----- ----- ----- ----- ----- ----- 0.489 0.489

11.67 1.286 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.516 0.516

11.70 1.438 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.548 0.548

11.73 1.631 427.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.585 0.585

11.77 1.874 427.35 ----- ----- ----- ----- ----- ----- ----- ----- 0.629 0.629

11.80 2.190 427.38 ----- ----- ----- ----- ----- ----- ----- ----- 0.681 0.681

11.83 2.602 427.41 ----- ----- ----- ----- ----- ----- ----- ----- 0.746 0.746

11.87 3.139 427.46 ----- ----- ----- ----- ----- ----- ----- ----- 0.825 0.825

11.90 3.832 427.51 ----- ----- ----- ----- ----- ----- ----- ----- 0.925 0.925

11.93 4.675 427.58 ----- ----- ----- ----- ----- ----- ----- ----- 1.050 1.050

11.97 5.617 427.67 ----- ----- ----- ----- ----- ----- ----- ----- 1.203 1.203

12.00 6.601 427.77 ----- ----- ----- ----- ----- ----- ----- ----- 1.387 1.387

12.03 7.600 427.89 ----- ----- ----- ----- ----- ----- ----- ----- 1.601 1.601

12.07 8.612 428.01 ----- ----- ----- ----- ----- ----- ----- ----- 1.812 1.812

12.10 9.630 428.10 ----- ----- ----- ----- ----- ----- ----- ----- 1.866 1.866

12.13 10.65 428.20 ----- ----- ----- ----- ----- ----- ----- ----- 1.926 1.926

12.17 11.65 428.30 ----- ----- ----- ----- ----- ----- ----- ----- 1.994 1.994

12.20 12.63 428.42 ----- ----- ----- ----- ----- ----- ----- ----- 2.068 2.068

12.23 13.58 428.55 ----- ----- ----- ----- ----- ----- ----- ----- 2.149 2.149

12.27 14.47 428.69 ----- ----- ----- ----- ----- ----- ----- ----- 2.236 2.236

12.30 15.30 428.84 ----- ----- ----- ----- ----- ----- ----- ----- 2.328 2.328

12.33 16.05 429.00 ----- ----- ----- ----- ----- ----- ----- ----- 2.426 2.426

12.37 16.67 429.12 ----- ----- ----- ----- ----- ----- ----- ----- 2.501 2.501

12.40 17.11 429.26 ----- ----- ----- ----- ----- ----- ----- ----- 2.577 2.577

12.43 17.34 << 429.39 ----- ----- ----- ----- ----- ----- ----- ----- 2.655 2.655

12.47 17.29 429.52 ----- ----- ----- ----- ----- ----- ----- ----- 2.732 2.732

12.50 16.96 429.65 ----- ----- ----- ----- ----- ----- ----- ----- 2.809 2.809

12.53 16.46 429.78 ----- ----- ----- ----- ----- ----- ----- ----- 2.883 2.883 Continues on next page...
4 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

12.57 15.87 429.90 ----- ----- ----- ----- ----- ----- ----- ----- 2.953 2.953

12.60 15.26 430.01 ----- ----- ----- ----- ----- ----- ----- ----- 3.018 3.018

12.63 14.62 430.10 ----- ----- ----- ----- ----- ----- ----- ----- 3.069 3.069

12.67 13.96 430.19 ----- ----- ----- ----- ----- ----- ----- ----- 3.117 3.117

12.70 13.27 430.27 ----- ----- ----- ----- ----- ----- ----- ----- 3.162 3.162

12.73 12.56 430.34 ----- ----- ----- ----- ----- ----- ----- ----- 3.203 3.203

12.77 11.83 430.41 ----- ----- ----- ----- ----- ----- ----- ----- 3.242 3.242

12.80 11.09 430.47 ----- ----- ----- ----- ----- ----- ----- ----- 3.277 3.277

12.83 10.33 430.53 ----- ----- ----- ----- ----- ----- ----- ----- 3.309 3.309

12.87 9.572 430.58 ----- ----- ----- ----- ----- ----- ----- ----- 3.337 3.337

12.90 8.810 430.62 ----- ----- ----- ----- ----- ----- ----- ----- 3.362 3.362

12.93 8.055 430.66 ----- ----- ----- ----- ----- ----- ----- ----- 3.384 3.384

12.97 7.314 430.69 ----- ----- ----- ----- ----- ----- ----- ----- 3.402 3.402

13.00 6.596 430.72 ----- ----- ----- ----- ----- ----- ----- ----- 3.418 3.418

13.03 5.909 430.74 ----- ----- ----- ----- ----- ----- ----- ----- 3.430 3.430

13.07 5.274 430.76 ----- ----- ----- ----- ----- ----- ----- ----- 3.439 3.439

13.10 4.710 430.77 ----- ----- ----- ----- ----- ----- ----- ----- 3.446 3.446

13.13 4.241 430.78 ----- ----- ----- ----- ----- ----- ----- ----- 3.450 3.450

13.17 3.894 430.78 ----- ----- ----- ----- ----- ----- ----- ----- 3.453 3.453

13.20 3.663 430.78 ----- ----- ----- ----- ----- ----- ----- ----- 3.454 3.454

13.23 3.509 430.78 << ----- ----- ----- ----- ----- ----- ----- ----- 3.455 3.455 <<

13.27 3.386 430.78 ----- ----- ----- ----- ----- ----- ----- ----- 3.455 3.455

13.30 3.272 430.78 ----- ----- ----- ----- ----- ----- ----- ----- 3.454 3.454

13.33 3.165 430.78 ----- ----- ----- ----- ----- ----- ----- ----- 3.453 3.453

13.37 3.066 430.78 ----- ----- ----- ----- ----- ----- ----- ----- 3.452 3.452

13.40 2.975 430.78 ----- ----- ----- ----- ----- ----- ----- ----- 3.450 3.450

13.43 2.890 430.77 ----- ----- ----- ----- ----- ----- ----- ----- 3.448 3.448 Continues on next page...
5 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

13.47 2.811 430.77 ----- ----- ----- ----- ----- ----- ----- ----- 3.445 3.445

13.50 2.739 430.76 ----- ----- ----- ----- ----- ----- ----- ----- 3.442 3.442

13.53 2.672 430.76 ----- ----- ----- ----- ----- ----- ----- ----- 3.439 3.439

13.57 2.610 430.75 ----- ----- ----- ----- ----- ----- ----- ----- 3.436 3.436

13.60 2.553 430.74 ----- ----- ----- ----- ----- ----- ----- ----- 3.432 3.432

13.63 2.499 430.74 ----- ----- ----- ----- ----- ----- ----- ----- 3.428 3.428

13.67 2.450 430.73 ----- ----- ----- ----- ----- ----- ----- ----- 3.424 3.424

13.70 2.403 430.72 ----- ----- ----- ----- ----- ----- ----- ----- 3.420 3.420

13.73 2.358 430.71 ----- ----- ----- ----- ----- ----- ----- ----- 3.415 3.415

13.77 2.315 430.71 ----- ----- ----- ----- ----- ----- ----- ----- 3.411 3.411

13.80 2.273 430.70 ----- ----- ----- ----- ----- ----- ----- ----- 3.406 3.406

13.83 2.232 430.69 ----- ----- ----- ----- ----- ----- ----- ----- 3.401 3.401

13.87 2.193 430.68 ----- ----- ----- ----- ----- ----- ----- ----- 3.396 3.396

13.90 2.155 430.67 ----- ----- ----- ----- ----- ----- ----- ----- 3.391 3.391

13.93 2.118 430.66 ----- ----- ----- ----- ----- ----- ----- ----- 3.385 3.385

13.97 2.082 430.65 ----- ----- ----- ----- ----- ----- ----- ----- 3.380 3.380

14.00 2.047 430.64 ----- ----- ----- ----- ----- ----- ----- ----- 3.374 3.374

14.03 2.013 430.63 ----- ----- ----- ----- ----- ----- ----- ----- 3.368 3.368

14.07 1.981 430.62 ----- ----- ----- ----- ----- ----- ----- ----- 3.363 3.363

14.10 1.949 430.61 ----- ----- ----- ----- ----- ----- ----- ----- 3.357 3.357

14.13 1.918 430.60 ----- ----- ----- ----- ----- ----- ----- ----- 3.350 3.350

14.17 1.889 430.59 ----- ----- ----- ----- ----- ----- ----- ----- 3.344 3.344

14.20 1.860 430.58 ----- ----- ----- ----- ----- ----- ----- ----- 3.338 3.338

14.23 1.832 430.57 ----- ----- ----- ----- ----- ----- ----- ----- 3.332 3.332

14.27 1.804 430.56 ----- ----- ----- ----- ----- ----- ----- ----- 3.325 3.325

14.30 1.778 430.54 ----- ----- ----- ----- ----- ----- ----- ----- 3.319 3.319

14.33 1.753 430.53 ----- ----- ----- ----- ----- ----- ----- ----- 3.312 3.312

14.37 1.728 430.52 ----- ----- ----- ----- ----- ----- ----- ----- 3.305 3.305 Continues on next page...
6 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

14.40 1.704 430.51 ----- ----- ----- ----- ----- ----- ----- ----- 3.298 3.298

14.43 1.681 430.50 ----- ----- ----- ----- ----- ----- ----- ----- 3.292 3.292

14.47 1.659 430.48 ----- ----- ----- ----- ----- ----- ----- ----- 3.285 3.285

14.50 1.638 430.47 ----- ----- ----- ----- ----- ----- ----- ----- 3.278 3.278

14.53 1.618 430.46 ----- ----- ----- ----- ----- ----- ----- ----- 3.271 3.271

14.57 1.599 430.45 ----- ----- ----- ----- ----- ----- ----- ----- 3.263 3.263

14.60 1.581 430.43 ----- ----- ----- ----- ----- ----- ----- ----- 3.256 3.256

14.63 1.565 430.42 ----- ----- ----- ----- ----- ----- ----- ----- 3.249 3.249

14.67 1.549 430.41 ----- ----- ----- ----- ----- ----- ----- ----- 3.242 3.242

14.70 1.533 430.40 ----- ----- ----- ----- ----- ----- ----- ----- 3.235 3.235

14.73 1.519 430.38 ----- ----- ----- ----- ----- ----- ----- ----- 3.227 3.227

14.77 1.505 430.37 ----- ----- ----- ----- ----- ----- ----- ----- 3.220 3.220

14.80 1.492 430.36 ----- ----- ----- ----- ----- ----- ----- ----- 3.213 3.213

14.83 1.479 430.34 ----- ----- ----- ----- ----- ----- ----- ----- 3.205 3.205

14.87 1.467 430.33 ----- ----- ----- ----- ----- ----- ----- ----- 3.198 3.198

14.90 1.456 430.32 ----- ----- ----- ----- ----- ----- ----- ----- 3.190 3.190

14.93 1.445 430.31 ----- ----- ----- ----- ----- ----- ----- ----- 3.183 3.183

14.97 1.434 430.29 ----- ----- ----- ----- ----- ----- ----- ----- 3.175 3.175

15.00 1.424 430.28 ----- ----- ----- ----- ----- ----- ----- ----- 3.168 3.168

15.03 1.414 430.27 ----- ----- ----- ----- ----- ----- ----- ----- 3.160 3.160

15.07 1.404 430.25 ----- ----- ----- ----- ----- ----- ----- ----- 3.153 3.153

15.10 1.394 430.24 ----- ----- ----- ----- ----- ----- ----- ----- 3.145 3.145

15.13 1.385 430.23 ----- ----- ----- ----- ----- ----- ----- ----- 3.138 3.138

15.17 1.376 430.21 ----- ----- ----- ----- ----- ----- ----- ----- 3.130 3.130

15.20 1.367 430.20 ----- ----- ----- ----- ----- ----- ----- ----- 3.123 3.123

15.23 1.358 430.19 ----- ----- ----- ----- ----- ----- ----- ----- 3.115 3.115

15.27 1.349 430.17 ----- ----- ----- ----- ----- ----- ----- ----- 3.108 3.108

15.30 1.339 430.16 ----- ----- ----- ----- ----- ----- ----- ----- 3.100 3.100 Continues on next page...
7 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

15.33 1.330 430.15 ----- ----- ----- ----- ----- ----- ----- ----- 3.093 3.093

15.37 1.321 430.13 ----- ----- ----- ----- ----- ----- ----- ----- 3.085 3.085

15.40 1.312 430.12 ----- ----- ----- ----- ----- ----- ----- ----- 3.078 3.078

15.43 1.303 430.11 ----- ----- ----- ----- ----- ----- ----- ----- 3.070 3.070

15.47 1.294 430.09 ----- ----- ----- ----- ----- ----- ----- ----- 3.062 3.062

15.50 1.285 430.08 ----- ----- ----- ----- ----- ----- ----- ----- 3.055 3.055

15.53 1.276 430.07 ----- ----- ----- ----- ----- ----- ----- ----- 3.047 3.047

15.57 1.266 430.05 ----- ----- ----- ----- ----- ----- ----- ----- 3.040 3.040

15.60 1.257 430.04 ----- ----- ----- ----- ----- ----- ----- ----- 3.032 3.032

15.63 1.248 430.03 ----- ----- ----- ----- ----- ----- ----- ----- 3.024 3.024

15.67 1.239 430.01 ----- ----- ----- ----- ----- ----- ----- ----- 3.017 3.017

15.70 1.229 430.00 ----- ----- ----- ----- ----- ----- ----- ----- 3.009 3.009

15.73 1.220 429.98 ----- ----- ----- ----- ----- ----- ----- ----- 3.000 3.000

15.77 1.211 429.97 ----- ----- ----- ----- ----- ----- ----- ----- 2.990 2.990

15.80 1.202 429.95 ----- ----- ----- ----- ----- ----- ----- ----- 2.981 2.981

15.83 1.192 429.93 ----- ----- ----- ----- ----- ----- ----- ----- 2.971 2.971

15.87 1.183 429.92 ----- ----- ----- ----- ----- ----- ----- ----- 2.962 2.962

15.90 1.174 429.90 ----- ----- ----- ----- ----- ----- ----- ----- 2.952 2.952

15.93 1.164 429.89 ----- ----- ----- ----- ----- ----- ----- ----- 2.943 2.943

15.97 1.155 429.87 ----- ----- ----- ----- ----- ----- ----- ----- 2.934 2.934

16.00 1.145 429.85 ----- ----- ----- ----- ----- ----- ----- ----- 2.924 2.924

16.03 1.136 429.84 ----- ----- ----- ----- ----- ----- ----- ----- 2.915 2.915

16.07 1.127 429.82 ----- ----- ----- ----- ----- ----- ----- ----- 2.905 2.905

16.10 1.117 429.80 ----- ----- ----- ----- ----- ----- ----- ----- 2.896 2.896

16.13 1.108 429.79 ----- ----- ----- ----- ----- ----- ----- ----- 2.886 2.886

16.17 1.099 429.77 ----- ----- ----- ----- ----- ----- ----- ----- 2.877 2.877

16.20 1.090 429.76 ----- ----- ----- ----- ----- ----- ----- ----- 2.867 2.867

16.23 1.081 429.74 ----- ----- ----- ----- ----- ----- ----- ----- 2.858 2.858 Continues on next page...
8 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

16.27 1.072 429.72 ----- ----- ----- ----- ----- ----- ----- ----- 2.848 2.848

16.30 1.063 429.71 ----- ----- ----- ----- ----- ----- ----- ----- 2.839 2.839

16.33 1.055 429.69 ----- ----- ----- ----- ----- ----- ----- ----- 2.830 2.830

16.37 1.047 429.67 ----- ----- ----- ----- ----- ----- ----- ----- 2.820 2.820

16.40 1.038 429.66 ----- ----- ----- ----- ----- ----- ----- ----- 2.811 2.811

16.43 1.031 429.64 ----- ----- ----- ----- ----- ----- ----- ----- 2.801 2.801

16.47 1.023 429.63 ----- ----- ----- ----- ----- ----- ----- ----- 2.792 2.792

16.50 1.016 429.61 ----- ----- ----- ----- ----- ----- ----- ----- 2.782 2.782

16.53 1.009 429.59 ----- ----- ----- ----- ----- ----- ----- ----- 2.773 2.773

16.57 1.002 429.58 ----- ----- ----- ----- ----- ----- ----- ----- 2.764 2.764

16.60 0.996 429.56 ----- ----- ----- ----- ----- ----- ----- ----- 2.754 2.754

16.63 0.990 429.54 ----- ----- ----- ----- ----- ----- ----- ----- 2.745 2.745

16.67 0.984 429.53 ----- ----- ----- ----- ----- ----- ----- ----- 2.736 2.736

16.70 0.978 429.51 ----- ----- ----- ----- ----- ----- ----- ----- 2.726 2.726

16.73 0.973 429.50 ----- ----- ----- ----- ----- ----- ----- ----- 2.717 2.717

16.77 0.968 429.48 ----- ----- ----- ----- ----- ----- ----- ----- 2.708 2.708

16.80 0.963 429.47 ----- ----- ----- ----- ----- ----- ----- ----- 2.699 2.699

16.83 0.959 429.45 ----- ----- ----- ----- ----- ----- ----- ----- 2.689 2.689

16.87 0.954 429.43 ----- ----- ----- ----- ----- ----- ----- ----- 2.680 2.680

16.90 0.950 429.42 ----- ----- ----- ----- ----- ----- ----- ----- 2.671 2.671

16.93 0.946 429.40 ----- ----- ----- ----- ----- ----- ----- ----- 2.662 2.662

16.97 0.942 429.39 ----- ----- ----- ----- ----- ----- ----- ----- 2.653 2.653

17.00 0.938 429.37 ----- ----- ----- ----- ----- ----- ----- ----- 2.644 2.644

17.03 0.935 429.35 ----- ----- ----- ----- ----- ----- ----- ----- 2.635 2.635

17.07 0.931 429.34 ----- ----- ----- ----- ----- ----- ----- ----- 2.626 2.626

17.10 0.927 429.32 ----- ----- ----- ----- ----- ----- ----- ----- 2.617 2.617

17.13 0.924 429.31 ----- ----- ----- ----- ----- ----- ----- ----- 2.608 2.608

17.17 0.921 429.29 ----- ----- ----- ----- ----- ----- ----- ----- 2.599 2.599 Continues on next page...
9 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

17.20 0.917 429.28 ----- ----- ----- ----- ----- ----- ----- ----- 2.590 2.590

17.23 0.914 429.26 ----- ----- ----- ----- ----- ----- ----- ----- 2.581 2.581

17.27 0.911 429.25 ----- ----- ----- ----- ----- ----- ----- ----- 2.572 2.572

17.30 0.908 429.23 ----- ----- ----- ----- ----- ----- ----- ----- 2.563 2.563

17.33 0.904 429.22 ----- ----- ----- ----- ----- ----- ----- ----- 2.554 2.554

17.37 0.901 429.20 ----- ----- ----- ----- ----- ----- ----- ----- 2.546 2.546

17.40 0.898 429.19 ----- ----- ----- ----- ----- ----- ----- ----- 2.537 2.537

17.43 0.894 429.17 ----- ----- ----- ----- ----- ----- ----- ----- 2.528 2.528

17.47 0.891 429.16 ----- ----- ----- ----- ----- ----- ----- ----- 2.519 2.519

17.50 0.888 429.14 ----- ----- ----- ----- ----- ----- ----- ----- 2.511 2.511

17.53 0.884 429.13 ----- ----- ----- ----- ----- ----- ----- ----- 2.502 2.502

17.57 0.881 429.11 ----- ----- ----- ----- ----- ----- ----- ----- 2.494 2.494

17.60 0.878 429.10 ----- ----- ----- ----- ----- ----- ----- ----- 2.485 2.485

17.63 0.874 429.08 ----- ----- ----- ----- ----- ----- ----- ----- 2.477 2.477

17.67 0.871 429.07 ----- ----- ----- ----- ----- ----- ----- ----- 2.468 2.468

17.70 0.868 429.05 ----- ----- ----- ----- ----- ----- ----- ----- 2.460 2.460

17.73 0.864 429.04 ----- ----- ----- ----- ----- ----- ----- ----- 2.451 2.451

17.77 0.861 429.02 ----- ----- ----- ----- ----- ----- ----- ----- 2.443 2.443

17.80 0.858 429.01 ----- ----- ----- ----- ----- ----- ----- ----- 2.434 2.434

17.83 0.854 428.99 ----- ----- ----- ----- ----- ----- ----- ----- 2.425 2.425

17.87 0.851 428.98 ----- ----- ----- ----- ----- ----- ----- ----- 2.413 2.413

17.90 0.848 428.96 ----- ----- ----- ----- ----- ----- ----- ----- 2.402 2.402

17.93 0.844 428.94 ----- ----- ----- ----- ----- ----- ----- ----- 2.391 2.391

17.97 0.841 428.92 ----- ----- ----- ----- ----- ----- ----- ----- 2.379 2.379

18.00 0.838 428.90 ----- ----- ----- ----- ----- ----- ----- ----- 2.368 2.368

18.03 0.834 428.89 ----- ----- ----- ----- ----- ----- ----- ----- 2.357 2.357

18.07 0.831 428.87 ----- ----- ----- ----- ----- ----- ----- ----- 2.346 2.346

18.10 0.827 428.85 ----- ----- ----- ----- ----- ----- ----- ----- 2.335 2.335 Continues on next page...
10 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

18.13 0.824 428.83 ----- ----- ----- ----- ----- ----- ----- ----- 2.324 2.324

18.17 0.821 428.81 ----- ----- ----- ----- ----- ----- ----- ----- 2.313 2.313

18.20 0.817 428.80 ----- ----- ----- ----- ----- ----- ----- ----- 2.302 2.302

18.23 0.814 428.78 ----- ----- ----- ----- ----- ----- ----- ----- 2.291 2.291

18.27 0.810 428.76 ----- ----- ----- ----- ----- ----- ----- ----- 2.280 2.280

18.30 0.807 428.74 ----- ----- ----- ----- ----- ----- ----- ----- 2.269 2.269

18.33 0.804 428.73 ----- ----- ----- ----- ----- ----- ----- ----- 2.258 2.258

18.37 0.800 428.71 ----- ----- ----- ----- ----- ----- ----- ----- 2.248 2.248

18.40 0.797 428.69 ----- ----- ----- ----- ----- ----- ----- ----- 2.237 2.237

18.43 0.794 428.68 ----- ----- ----- ----- ----- ----- ----- ----- 2.227 2.227

18.47 0.790 428.66 ----- ----- ----- ----- ----- ----- ----- ----- 2.216 2.216

18.50 0.787 428.64 ----- ----- ----- ----- ----- ----- ----- ----- 2.206 2.206

18.53 0.783 428.63 ----- ----- ----- ----- ----- ----- ----- ----- 2.195 2.195

18.57 0.780 428.61 ----- ----- ----- ----- ----- ----- ----- ----- 2.185 2.185

18.60 0.776 428.59 ----- ----- ----- ----- ----- ----- ----- ----- 2.175 2.175

18.63 0.773 428.58 ----- ----- ----- ----- ----- ----- ----- ----- 2.164 2.164

18.67 0.770 428.56 ----- ----- ----- ----- ----- ----- ----- ----- 2.154 2.154

18.70 0.766 428.54 ----- ----- ----- ----- ----- ----- ----- ----- 2.144 2.144

18.73 0.763 428.53 ----- ----- ----- ----- ----- ----- ----- ----- 2.134 2.134

18.77 0.759 428.51 ----- ----- ----- ----- ----- ----- ----- ----- 2.124 2.124

18.80 0.756 428.50 ----- ----- ----- ----- ----- ----- ----- ----- 2.114 2.114

18.83 0.752 428.48 ----- ----- ----- ----- ----- ----- ----- ----- 2.104 2.104

18.87 0.749 428.46 ----- ----- ----- ----- ----- ----- ----- ----- 2.094 2.094

18.90 0.746 428.45 ----- ----- ----- ----- ----- ----- ----- ----- 2.084 2.084

18.93 0.742 428.43 ----- ----- ----- ----- ----- ----- ----- ----- 2.074 2.074

18.97 0.739 428.42 ----- ----- ----- ----- ----- ----- ----- ----- 2.065 2.065

19.00 0.735 428.40 ----- ----- ----- ----- ----- ----- ----- ----- 2.055 2.055

19.03 0.732 428.39 ----- ----- ----- ----- ----- ----- ----- ----- 2.045 2.045 Continues on next page...
11 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

19.07 0.728 428.37 ----- ----- ----- ----- ----- ----- ----- ----- 2.036 2.036

19.10 0.725 428.36 ----- ----- ----- ----- ----- ----- ----- ----- 2.026 2.026

19.13 0.721 428.34 ----- ----- ----- ----- ----- ----- ----- ----- 2.017 2.017

19.17 0.718 428.32 ----- ----- ----- ----- ----- ----- ----- ----- 2.007 2.007

19.20 0.715 428.31 ----- ----- ----- ----- ----- ----- ----- ----- 1.998 1.998

19.23 0.711 428.29 ----- ----- ----- ----- ----- ----- ----- ----- 1.988 1.988

19.27 0.708 428.28 ----- ----- ----- ----- ----- ----- ----- ----- 1.979 1.979

19.30 0.704 428.26 ----- ----- ----- ----- ----- ----- ----- ----- 1.969 1.969

19.33 0.701 428.25 ----- ----- ----- ----- ----- ----- ----- ----- 1.960 1.960

19.37 0.697 428.23 ----- ----- ----- ----- ----- ----- ----- ----- 1.951 1.951

19.40 0.694 428.22 ----- ----- ----- ----- ----- ----- ----- ----- 1.942 1.942

19.43 0.690 428.21 ----- ----- ----- ----- ----- ----- ----- ----- 1.933 1.933

19.47 0.687 428.19 ----- ----- ----- ----- ----- ----- ----- ----- 1.924 1.924

19.50 0.683 428.18 ----- ----- ----- ----- ----- ----- ----- ----- 1.914 1.914

19.53 0.680 428.16 ----- ----- ----- ----- ----- ----- ----- ----- 1.905 1.905

19.57 0.676 428.15 ----- ----- ----- ----- ----- ----- ----- ----- 1.896 1.896

19.60 0.673 428.13 ----- ----- ----- ----- ----- ----- ----- ----- 1.888 1.888

19.63 0.669 428.12 ----- ----- ----- ----- ----- ----- ----- ----- 1.879 1.879

19.67 0.666 428.10 ----- ----- ----- ----- ----- ----- ----- ----- 1.870 1.870

19.70 0.662 428.09 ----- ----- ----- ----- ----- ----- ----- ----- 1.861 1.861

19.73 0.659 428.08 ----- ----- ----- ----- ----- ----- ----- ----- 1.852 1.852

19.77 0.655 428.06 ----- ----- ----- ----- ----- ----- ----- ----- 1.843 1.843

19.80 0.652 428.05 ----- ----- ----- ----- ----- ----- ----- ----- 1.835 1.835

19.83 0.648 428.03 ----- ----- ----- ----- ----- ----- ----- ----- 1.826 1.826

19.87 0.645 428.02 ----- ----- ----- ----- ----- ----- ----- ----- 1.817 1.817

19.90 0.641 428.01 ----- ----- ----- ----- ----- ----- ----- ----- 1.809 1.809

19.93 0.638 427.99 ----- ----- ----- ----- ----- ----- ----- ----- 1.782 1.782

19.97 0.634 427.96 ----- ----- ----- ----- ----- ----- ----- ----- 1.739 1.739 Continues on next page...
12 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

20.00 0.631 427.94 ----- ----- ----- ----- ----- ----- ----- ----- 1.698 1.698

20.03 0.627 427.92 ----- ----- ----- ----- ----- ----- ----- ----- 1.658 1.658

20.07 0.624 427.90 ----- ----- ----- ----- ----- ----- ----- ----- 1.619 1.619

20.10 0.620 427.88 ----- ----- ----- ----- ----- ----- ----- ----- 1.582 1.582

20.13 0.617 427.86 ----- ----- ----- ----- ----- ----- ----- ----- 1.546 1.546

20.17 0.613 427.84 ----- ----- ----- ----- ----- ----- ----- ----- 1.511 1.511

20.20 0.610 427.82 ----- ----- ----- ----- ----- ----- ----- ----- 1.477 1.477

20.23 0.607 427.80 ----- ----- ----- ----- ----- ----- ----- ----- 1.445 1.445

20.27 0.603 427.78 ----- ----- ----- ----- ----- ----- ----- ----- 1.413 1.413

20.30 0.600 427.77 ----- ----- ----- ----- ----- ----- ----- ----- 1.383 1.383

20.33 0.597 427.75 ----- ----- ----- ----- ----- ----- ----- ----- 1.353 1.353

20.37 0.594 427.73 ----- ----- ----- ----- ----- ----- ----- ----- 1.325 1.325

20.40 0.591 427.72 ----- ----- ----- ----- ----- ----- ----- ----- 1.298 1.298

20.43 0.589 427.70 ----- ----- ----- ----- ----- ----- ----- ----- 1.271 1.271

20.47 0.586 427.69 ----- ----- ----- ----- ----- ----- ----- ----- 1.245 1.245

20.50 0.583 427.68 ----- ----- ----- ----- ----- ----- ----- ----- 1.221 1.221

20.53 0.581 427.66 ----- ----- ----- ----- ----- ----- ----- ----- 1.197 1.197

20.57 0.579 427.65 ----- ----- ----- ----- ----- ----- ----- ----- 1.174 1.174

20.60 0.577 427.64 ----- ----- ----- ----- ----- ----- ----- ----- 1.151 1.151

20.63 0.575 427.63 ----- ----- ----- ----- ----- ----- ----- ----- 1.130 1.130

20.67 0.573 427.61 ----- ----- ----- ----- ----- ----- ----- ----- 1.109 1.109

20.70 0.571 427.60 ----- ----- ----- ----- ----- ----- ----- ----- 1.089 1.089

20.73 0.570 427.59 ----- ----- ----- ----- ----- ----- ----- ----- 1.069 1.069

20.77 0.568 427.58 ----- ----- ----- ----- ----- ----- ----- ----- 1.051 1.051

20.80 0.567 427.57 ----- ----- ----- ----- ----- ----- ----- ----- 1.033 1.033

20.83 0.565 427.56 ----- ----- ----- ----- ----- ----- ----- ----- 1.015 1.015

20.87 0.564 427.55 ----- ----- ----- ----- ----- ----- ----- ----- 0.998 0.998

20.90 0.563 427.54 ----- ----- ----- ----- ----- ----- ----- ----- 0.982 0.982 Continues on next page...
13 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

20.93 0.562 427.54 ----- ----- ----- ----- ----- ----- ----- ----- 0.966 0.966

20.97 0.561 427.53 ----- ----- ----- ----- ----- ----- ----- ----- 0.951 0.951

21.00 0.560 427.52 ----- ----- ----- ----- ----- ----- ----- ----- 0.936 0.936

21.03 0.560 427.51 ----- ----- ----- ----- ----- ----- ----- ----- 0.922 0.922

21.07 0.559 427.50 ----- ----- ----- ----- ----- ----- ----- ----- 0.909 0.909

21.10 0.558 427.50 ----- ----- ----- ----- ----- ----- ----- ----- 0.896 0.896

21.13 0.557 427.49 ----- ----- ----- ----- ----- ----- ----- ----- 0.883 0.883

21.17 0.557 427.48 ----- ----- ----- ----- ----- ----- ----- ----- 0.871 0.871

21.20 0.556 427.48 ----- ----- ----- ----- ----- ----- ----- ----- 0.859 0.859

21.23 0.555 427.47 ----- ----- ----- ----- ----- ----- ----- ----- 0.848 0.848

21.27 0.555 427.46 ----- ----- ----- ----- ----- ----- ----- ----- 0.837 0.837

21.30 0.554 427.46 ----- ----- ----- ----- ----- ----- ----- ----- 0.826 0.826

21.33 0.553 427.45 ----- ----- ----- ----- ----- ----- ----- ----- 0.816 0.816

21.37 0.553 427.45 ----- ----- ----- ----- ----- ----- ----- ----- 0.806 0.806

21.40 0.552 427.44 ----- ----- ----- ----- ----- ----- ----- ----- 0.797 0.797

21.43 0.551 427.44 ----- ----- ----- ----- ----- ----- ----- ----- 0.787 0.787

21.47 0.551 427.43 ----- ----- ----- ----- ----- ----- ----- ----- 0.779 0.779

21.50 0.550 427.43 ----- ----- ----- ----- ----- ----- ----- ----- 0.770 0.770

21.53 0.550 427.42 ----- ----- ----- ----- ----- ----- ----- ----- 0.762 0.762

21.57 0.549 427.42 ----- ----- ----- ----- ----- ----- ----- ----- 0.754 0.754

21.60 0.548 427.41 ----- ----- ----- ----- ----- ----- ----- ----- 0.746 0.746

21.63 0.548 427.41 ----- ----- ----- ----- ----- ----- ----- ----- 0.739 0.739

21.67 0.547 427.41 ----- ----- ----- ----- ----- ----- ----- ----- 0.731 0.731

21.70 0.546 427.40 ----- ----- ----- ----- ----- ----- ----- ----- 0.725 0.725

21.73 0.546 427.40 ----- ----- ----- ----- ----- ----- ----- ----- 0.718 0.718

21.77 0.545 427.39 ----- ----- ----- ----- ----- ----- ----- ----- 0.711 0.711

21.80 0.544 427.39 ----- ----- ----- ----- ----- ----- ----- ----- 0.705 0.705

21.83 0.544 427.39 ----- ----- ----- ----- ----- ----- ----- ----- 0.699 0.699 Continues on next page...
14 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

21.87 0.543 427.38 ----- ----- ----- ----- ----- ----- ----- ----- 0.693 0.693

21.90 0.542 427.38 ----- ----- ----- ----- ----- ----- ----- ----- 0.688 0.688

21.93 0.542 427.38 ----- ----- ----- ----- ----- ----- ----- ----- 0.682 0.682

21.97 0.541 427.38 ----- ----- ----- ----- ----- ----- ----- ----- 0.677 0.677

22.00 0.540 427.37 ----- ----- ----- ----- ----- ----- ----- ----- 0.672 0.672

22.03 0.540 427.37 ----- ----- ----- ----- ----- ----- ----- ----- 0.667 0.667

22.07 0.539 427.37 ----- ----- ----- ----- ----- ----- ----- ----- 0.662 0.662

22.10 0.538 427.36 ----- ----- ----- ----- ----- ----- ----- ----- 0.657 0.657

22.13 0.538 427.36 ----- ----- ----- ----- ----- ----- ----- ----- 0.653 0.653

22.17 0.537 427.36 ----- ----- ----- ----- ----- ----- ----- ----- 0.649 0.649

22.20 0.536 427.36 ----- ----- ----- ----- ----- ----- ----- ----- 0.644 0.644

22.23 0.536 427.35 ----- ----- ----- ----- ----- ----- ----- ----- 0.640 0.640

22.27 0.535 427.35 ----- ----- ----- ----- ----- ----- ----- ----- 0.636 0.636

22.30 0.534 427.35 ----- ----- ----- ----- ----- ----- ----- ----- 0.633 0.633

22.33 0.534 427.35 ----- ----- ----- ----- ----- ----- ----- ----- 0.629 0.629

22.37 0.533 427.35 ----- ----- ----- ----- ----- ----- ----- ----- 0.625 0.625

22.40 0.532 427.34 ----- ----- ----- ----- ----- ----- ----- ----- 0.622 0.622

22.43 0.532 427.34 ----- ----- ----- ----- ----- ----- ----- ----- 0.619 0.619

22.47 0.531 427.34 ----- ----- ----- ----- ----- ----- ----- ----- 0.615 0.615

22.50 0.530 427.34 ----- ----- ----- ----- ----- ----- ----- ----- 0.612 0.612

22.53 0.530 427.34 ----- ----- ----- ----- ----- ----- ----- ----- 0.609 0.609

22.57 0.529 427.34 ----- ----- ----- ----- ----- ----- ----- ----- 0.606 0.606

22.60 0.529 427.33 ----- ----- ----- ----- ----- ----- ----- ----- 0.603 0.603

22.63 0.528 427.33 ----- ----- ----- ----- ----- ----- ----- ----- 0.600 0.600

22.67 0.527 427.33 ----- ----- ----- ----- ----- ----- ----- ----- 0.598 0.598

22.70 0.527 427.33 ----- ----- ----- ----- ----- ----- ----- ----- 0.595 0.595

22.73 0.526 427.33 ----- ----- ----- ----- ----- ----- ----- ----- 0.592 0.592

22.77 0.525 427.33 ----- ----- ----- ----- ----- ----- ----- ----- 0.590 0.590 Continues on next page...
15 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

22.80 0.525 427.33 ----- ----- ----- ----- ----- ----- ----- ----- 0.587 0.587

22.83 0.524 427.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.585 0.585

22.87 0.523 427.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.583 0.583

22.90 0.523 427.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.581 0.581

22.93 0.522 427.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.578 0.578

22.97 0.521 427.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.576 0.576

23.00 0.521 427.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.574 0.574

23.03 0.520 427.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.572 0.572

23.07 0.519 427.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.570 0.570

23.10 0.519 427.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.568 0.568

23.13 0.518 427.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.566 0.566

23.17 0.517 427.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.565 0.565

23.20 0.517 427.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.563 0.563

23.23 0.516 427.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.561 0.561

23.27 0.515 427.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.559 0.559

23.30 0.515 427.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.558 0.558

23.33 0.514 427.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.556 0.556

23.37 0.513 427.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.554 0.554

23.40 0.513 427.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.553 0.553

23.43 0.512 427.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.551 0.551

23.47 0.511 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.550 0.550

23.50 0.510 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.548 0.548

23.53 0.510 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.547 0.547

23.57 0.509 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.546 0.546

23.60 0.508 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.544 0.544

23.63 0.508 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.543 0.543

23.67 0.507 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.541 0.542

23.70 0.506 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.540 0.540 Continues on next page...
16 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

23.73 0.506 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.539 0.539

23.77 0.505 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.538 0.538

23.80 0.504 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.536 0.536

23.83 0.504 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.535 0.535

23.87 0.503 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.534 0.534

23.90 0.502 427.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.533 0.533

23.93 0.502 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.532 0.532

23.97 0.501 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.531 0.531

24.00 0.500 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.529 0.529

24.03 0.498 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.528 0.528

24.07 0.494 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.527 0.527

24.10 0.489 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.526 0.526

24.13 0.483 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.524 0.524

24.17 0.474 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.523 0.523

24.20 0.465 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.521 0.521

24.23 0.453 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.518 0.518

24.27 0.441 427.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.516 0.516

24.30 0.427 427.28 ----- ----- ----- ----- ----- ----- ----- ----- 0.513 0.513

24.33 0.411 427.28 ----- ----- ----- ----- ----- ----- ----- ----- 0.509 0.509

24.37 0.394 427.28 ----- ----- ----- ----- ----- ----- ----- ----- 0.505 0.505

24.40 0.375 427.28 ----- ----- ----- ----- ----- ----- ----- ----- 0.501 0.501

24.43 0.355 427.27 ----- ----- ----- ----- ----- ----- ----- ----- 0.495 0.495

24.47 0.333 427.27 ----- ----- ----- ----- ----- ----- ----- ----- 0.490 0.490

24.50 0.310 427.27 ----- ----- ----- ----- ----- ----- ----- ----- 0.483 0.483

24.53 0.285 427.26 ----- ----- ----- ----- ----- ----- ----- ----- 0.476 0.477

24.57 0.259 427.26 ----- ----- ----- ----- ----- ----- ----- ----- 0.469 0.469

24.60 0.235 427.26 ----- ----- ----- ----- ----- ----- ----- ----- 0.461 0.461

24.63 0.211 427.25 ----- ----- ----- ----- ----- ----- ----- ----- 0.452 0.452 Continues on next page...
17 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

24.67 0.189 427.25 ----- ----- ----- ----- ----- ----- ----- ----- 0.442 0.442

24.70 0.168 427.24 ----- ----- ----- ----- ----- ----- ----- ----- 0.432 0.432

24.73 0.148 427.23 ----- ----- ----- ----- ----- ----- ----- ----- 0.422 0.422

24.77 0.129 427.23 ----- ----- ----- ----- ----- ----- ----- ----- 0.411 0.411

24.80 0.112 427.22 ----- ----- ----- ----- ----- ----- ----- ----- 0.401 0.401

24.83 0.096 427.22 ----- ----- ----- ----- ----- ----- ----- ----- 0.389 0.389

24.87 0.081 427.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.378 0.378

24.90 0.068 427.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.367 0.367

24.93 0.055 427.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.355 0.355

24.97 0.044 427.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.344 0.344

25.00 0.034 427.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.333 0.332

25.03 0.026 427.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.321 0.321

25.07 0.018 427.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.310 0.310

25.10 0.012 427.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.299 0.299

25.13 0.007 427.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.288 0.288

25.17 0.004 427.15 ----- ----- ----- ----- ----- ----- ----- ----- 0.277 0.277

25.20 0.001 427.15 ----- ----- ----- ----- ----- ----- ----- ----- 0.267 0.267

25.23 0.000 427.14 ----- ----- ----- ----- ----- ----- ----- ----- 0.257 0.257

25.27 0.000 427.14 ----- ----- ----- ----- ----- ----- ----- ----- 0.248 0.248

25.30 0.000 427.13 ----- ----- ----- ----- ----- ----- ----- ----- 0.238 0.238

25.33 0.000 427.13 ----- ----- ----- ----- ----- ----- ----- ----- 0.229 0.229

25.37 0.000 427.12 ----- ----- ----- ----- ----- ----- ----- ----- 0.221 0.221

25.40 0.000 427.12 ----- ----- ----- ----- ----- ----- ----- ----- 0.213 0.213

25.43 0.000 427.11 ----- ----- ----- ----- ----- ----- ----- ----- 0.205 0.205

25.47 0.000 427.11 ----- ----- ----- ----- ----- ----- ----- ----- 0.197 0.197

25.50 0.000 427.11 ----- ----- ----- ----- ----- ----- ----- ----- 0.189 0.190

25.53 0.000 427.10 ----- ----- ----- ----- ----- ----- ----- ----- 0.182 0.182

25.57 0.000 427.10 ----- ----- ----- ----- ----- ----- ----- ----- 0.176 0.176 Continues on next page...
18 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

25.60 0.000 427.09 ----- ----- ----- ----- ----- ----- ----- ----- 0.169 0.169

25.63 0.000 427.09 ----- ----- ----- ----- ----- ----- ----- ----- 0.163 0.163

25.67 0.000 427.09 ----- ----- ----- ----- ----- ----- ----- ----- 0.157 0.157

25.70 0.000 427.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.151 0.151

25.73 0.000 427.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.145 0.145

25.77 0.000 427.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.140 0.140

25.80 0.000 427.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.134 0.134

25.83 0.000 427.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.129 0.129

25.87 0.000 427.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.125 0.125

25.90 0.000 427.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.120 0.120

25.93 0.000 427.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.115 0.115

25.97 0.000 427.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.111 0.111

26.00 0.000 427.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.107 0.107

26.03 0.000 427.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.103 0.103

26.07 0.000 427.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.099 0.099

26.10 0.000 427.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.095 0.095

26.13 0.000 427.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.092 0.092

26.17 0.000 427.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.088 0.088

26.20 0.000 427.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.085 0.085

26.23 0.000 427.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.082 0.082

26.27 0.000 427.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.079 0.079

26.30 0.000 427.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.076 0.076

26.33 0.000 427.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.073 0.073

26.37 0.000 427.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.070 0.070

26.40 0.000 427.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.068 0.068

26.43 0.000 427.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.065 0.065

26.47 0.000 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.063 0.063

26.50 0.000 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.060 0.060 Continues on next page...
19 EX. RETENTION BASIN, D
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

26.53 0.000 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.058 0.058

26.57 0.000 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.056 0.056

26.60 0.000 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.054 0.054

26.63 0.000 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.052 0.052

26.67 0.000 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.050 0.050

26.70 0.000 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.048 0.048

26.73 0.000 427.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.046 0.046

26.77 0.000 427.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.044 0.044

26.80 0.000 427.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.043 0.043

26.83 0.000 427.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.041 0.041

26.87 0.000 427.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.040 0.040

26.90 0.000 427.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.038 0.038

26.93 0.000 427.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.037 0.037

26.97 0.000 427.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.035 0.035 ...End
Pond Report 20
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Pond No. 1 - EX. RETENTION BASIN,D
Pond Data
Contours -User-defined contour areas. Conic method used for volume calculation. Begining Elevation = 447.00 ft Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft)

0.00 427.00 3,099 0 0

1.00 428.00 8,720 5,672 5,672

2.00 429.00 11,734 10,189 15,861

3.00 430.00 14,542 13,112 28,973

4.00 431.00 17,286 15,893 44,865

5.00 432.00 20,237 18,740 63,605

Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Clv C PrfRsr Wr A Wr B Wr C Wr D Exfil User Total ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

0.00 0 427.00 --- --- --- --- --- --- --- --- 0.000 --- 0.000

0.10 567 427.10 --- --- --- --- --- --- --- --- 0.180 --- 0.180

0.20 1,134 427.20 --- --- --- --- --- --- --- --- 0.361 --- 0.361

0.30 1,702 427.30 --- --- --- --- --- --- --- --- 0.541 --- 0.541

0.40 2,269 427.40 --- --- --- --- --- --- --- --- 0.722 --- 0.722

0.50 2,836 427.50 --- --- --- --- --- --- --- --- 0.902 --- 0.902

0.60 3,403 427.60 --- --- --- --- --- --- --- --- 1.083 --- 1.083

0.70 3,971 427.70 --- --- --- --- --- --- --- --- 1.263 --- 1.263

0.80 4,538 427.80 --- --- --- --- --- --- --- --- 1.444 --- 1.444

0.90 5,105 427.90 --- --- --- --- --- --- --- --- 1.624 --- 1.624

1.00 5,672 428.00 --- --- --- --- --- --- --- --- 1.805 --- 1.805

1.10 6,691 428.10 --- --- --- --- --- --- --- --- 1.867 --- 1.867

1.20 7,710 428.20 --- --- --- --- --- --- --- --- 1.929 --- 1.929

1.30 8,729 428.30 --- --- --- --- --- --- --- --- 1.992 --- 1.992

1.40 9,748 428.40 --- --- --- --- --- --- --- --- 2.054 --- 2.054

1.50 10,767 428.50 --- --- --- --- --- --- --- --- 2.116 --- 2.116

1.60 11,786 428.60 --- --- --- --- --- --- --- --- 2.179 --- 2.179

1.70 12,804 428.70 --- --- --- --- --- --- --- --- 2.241 --- 2.241

1.80 13,823 428.80 --- --- --- --- --- --- --- --- 2.304 --- 2.304

1.90 14,842 428.90 --- --- --- --- --- --- --- --- 2.366 --- 2.366

2.00 15,861 429.00 --- --- --- --- --- --- --- --- 2.428 --- 2.428

2.10 17,172 429.10 --- --- --- --- --- --- --- --- 2.486 --- 2.486

2.20 18,483 429.20 --- --- --- --- --- --- --- --- 2.544 --- 2.544

2.30 19,795 429.30 --- --- --- --- --- --- --- --- 2.603 --- 2.603

2.40 21,106 429.40 --- --- --- --- --- --- --- --- 2.661 --- 2.661

2.50 22,417 429.50 --- --- --- --- --- --- --- --- 2.719 --- 2.719

2.60 23,728 429.60 --- --- --- --- --- --- --- --- 2.777 --- 2.777

2.70 25,039 429.70 --- --- --- --- --- --- --- --- 2.835 --- 2.835

2.80 26,350 429.80 --- --- --- --- --- --- --- --- 2.893 --- 2.893

2.90 27,662 429.90 --- --- --- --- --- --- --- --- 2.951 --- 2.951

3.00 28,973 430.00 --- --- --- --- --- --- --- --- 3.009 --- 3.009

3.10 30,562 430.10 --- --- --- --- --- --- --- --- 3.066 --- 3.066

3.20 32,151 430.20 --- --- --- --- --- --- --- --- 3.123 --- 3.123

3.30 33,740 430.30 --- --- --- --- --- --- --- --- 3.180 --- 3.180

3.40 35,330 430.40 --- --- --- --- --- --- --- --- 3.236 --- 3.236

3.50 36,919 430.50 --- --- --- --- --- --- --- --- 3.293 --- 3.293 Continues on next page...
21 EX. RETENTION BASIN,D
Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Clv C PrfRsr Wr A Wr B Wr C Wr D Exfil User Total ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

3.60 38,508 430.60 --- --- --- --- --- --- --- --- 3.350 --- 3.350

3.70 40,097 430.70 --- --- --- --- --- --- --- --- 3.407 --- 3.407

3.80 41,687 430.80 --- --- --- --- --- --- --- --- 3.464 --- 3.464

3.90 43,276 430.90 --- --- --- --- --- --- --- --- 3.520 --- 3.520

4.00 44,865 431.00 --- --- --- --- --- --- --- --- 3.577 --- 3.577

4.10 46,739 431.10 --- --- --- --- --- --- --- --- 3.638 --- 3.638

4.20 48,613 431.20 --- --- --- --- --- --- --- --- 3.699 --- 3.699

4.30 50,487 431.30 --- --- --- --- --- --- --- --- 3.760 --- 3.760

4.40 52,361 431.40 --- --- --- --- --- --- --- --- 3.821 --- 3.821

4.50 54,235 431.50 --- --- --- --- --- --- --- --- 3.883 --- 3.883

4.60 56,109 431.60 --- --- --- --- --- --- --- --- 3.944 --- 3.944

4.70 57,983 431.70 --- --- --- --- --- --- --- --- 4.005 --- 4.005

4.80 59,857 431.80 --- --- --- --- --- --- --- --- 4.066 --- 4.066

4.90 61,731 431.90 --- --- --- --- --- --- --- --- 4.127 --- 4.127

5.00 63,605 432.00 --- --- --- --- --- --- --- --- 4.188 --- 4.188

5.10 65,789 432.10 --- --- --- --- --- --- --- --- 4.255 --- 4.255

5.20 67,972 432.20 --- --- --- --- --- --- --- --- 4.322 --- 4.322

5.30 70,156 432.30 --- --- --- --- --- --- --- --- 4.389 --- 4.389

5.40 72,340 432.40 --- --- --- --- --- --- --- --- 4.456 --- 4.456

5.50 74,523 432.50 --- --- --- --- --- --- --- --- 4.523 --- 4.523

5.60 76,707 432.60 --- --- --- --- --- --- --- --- 4.590 --- 4.590

5.70 78,890 432.70 --- --- --- --- --- --- --- --- 4.657 --- 4.657

5.80 81,074 432.80 --- --- --- --- --- --- --- --- 4.725 --- 4.725

5.90 83,257 432.90 --- --- --- --- --- --- --- --- 4.792 --- 4.792

6.00 85,441 433.00 --- --- --- --- --- --- --- --- 4.859 --- 4.859 ...End
Hydraflow Rainfall Report
22 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

APPENDIX 5
HYDROLOGY MAPS – PRE/POST DEVELOPMENT

HYDROLOGY MAPS

RIO ROSALIA DR

RIO FELICIA RD RIO ROSALIA DR

RIO GUADALUPE RD

RIO OSO RD

AVENIDA QUINTANA RIO PLATA RD
G

N I R E E N E I G
N f u l l c i r c l e t h i n k i n g LEGEND PREPARED BY: PRE-DEVELOPMENT DRAINAGE MAP CATHEDRAL CITY, CA TTM - 38709 & 38710 VICINITY MAP ASSESSORS PARCEL NUMBERS: OWNER/DEVELOPER: CIVIL ENGINEER:

RIO ROSALIA DR RIO FELICIA RD

RIO ROSALIA DR RIO GUADALUPE RD RIO OSO RD AVENIDA QUINTANA

RIO PLATA RD

RIO SACRAMENTO RD

G N I R E E N E I G N
f u l l c i r c l e t h i n k i n g
LEGEND
PREPARED BY:

VICINITY MAP
OWNER/DEVELOPER: CIVIL ENGINEER:

POST-DEVELOPMENT

DRAINAGE MAP

CATHEDRAL CITY, CA
TTM - 38709 & 38710
ASSESSORS PARCEL NUMBERS:

APPENDIX 6

EXCERTPS FROM APPROVED MASTER DRAINAGE
REPORT FOR TRACT 28639-1 FOR RIO VISTA
VILLAGE DATED MAY 4, 2001
(FOR REFERENCE ONLY)

APPENDIX 9

SUPPORTING DOCUMENTS

Source: ASCE
Runoff Coefficients (C)
Area Description Coefficient Value Typical DesignBusiness:Central business 0.70 - 0.95District and local 0.50 - 0.70Residential:Single family 0.35 - 0.45Multi-units detached 0.40 - 0.75Suburban 0.25 - 0.40Apartments 0.50 - 0.70Industrial:Light 0.50 - 0.80Heavy 0.60 - 0.90Parks, cemeteries 0.10 - 0.25Playgrounds 0.20 - 0.35Railroad yards 0.20 - 0.40LawnsSandy soil 0.05 - 0.20Heavy soil 0.18 - 0.35 0.30Unimproved 0.10 - 0.30 0.20Asphaltic 0.70 - 0.95 0.90Concrete 0.80 - 0.95 0.90Roofs 0.75 - 0.95 0.90 Runoff Coefficients (C) Page 1 of 1mk:@MSITStore:C:\Program%20Files\Autodesk\AutoCAD%202023\C3D\HHApps\Hydr o... 4/5/2023
The following table shows SCS curve number values, according to the SCS method for runoff calculations. Please scroll down for a description of the soil groups.

SCS Curve Numbers (CN)
Description of Land Use
Hydrologic Soil Group

A B C D
Paved parking lots, roofs, driveways 98 98 98 98
Streets and Roads
Paved with curbs and storm sewers 98 98 98 98
Gravel 76 85 89 91
Dirt 72 82 87 89
Cultivated (Agricultural Crop) Land
Without conservation treatment (no terraces) 72 81 88 91 With conservation treatment (terraces, contours) 62 71 78 81 Pasture or Range Land
Poor (<50% ground cover or heavily grazed) 68 79 86 89
Good (50-75% ground cover; Not heavily grazed) 39 61 74 80 Meadow (grass, no grazing, mowed for hay) 30 58 71 78
Brush (good, >75% ground cover) 30 48 65 73
Woods and Forests
Poor (small trees/brush destroyed by over-grazing or burning) 45 66 77 83 Fair (grazing but not burned; some brush) 36 60 73 79
Good (no grazing; brush covers ground) 30 55 70 77
Open Spaces (lawns, parks, golf courses, cemeteries, etc.) Fair (grass covers 50 – 75% of area) 49 69 79 84
Good (grass covers >75% of area) 39 61 74 80
Commercial and Business Districts (85% impervious) 89 92 94 95 Industrial Districts (72% impervious) 81 88 91 93
Residential Areas
1/8 acre lots, about 65% impervious 77 85 90 92
1/4 acre lots, about 38% impervious 61 75 83 87
1/2 acre lots, about 25% impervious 54 70 80 85
1 acre lots, about 20% impervious 51 68 79 84
Group A Soils: High infiltration (low runoff). Sand, loamy sand, or sandy loam. Infiltration rate > 0.3 in/hr when wet.

Group B Soils: Moderate infiltration (moderate runoff). Silt loam or loam. Infiltration rate 0.15 – 0.30 in/hr when wet.

Group C Soils: Low infiltration (moderate to high runoff). Sandy clay loam. Infiltration rate 0.05 – 0.150 in/hr when wet.

Group D Soils: Very low infiltration (high runoff). Clay loam, silty clay loam, sandy clay, silty clay, or clay. Infiltration rate 0 – 0.05 in/hr when wet.

HYDROLOGY AND HYDRAULICS REPORT
VERANO-Rio Vista Village
TTM 38710, 38711 & 38712
Cathedral City, CA
Prepared For
N C P V e r a n o , L L C
6 9 0 E G r e e n S t r e e t , S u i t e 2 0 0
Pa s a d e n a , C A 9 1 1 0 1
p h . ( 323 ) 8 7 4 - 8 0 0 0
Prepared By
Ray P. Erillo, PE
Fuscoe Engineering, Inc.
2850 Inland Empire Blvd. Building B
Ontario, California, 91764
909.581.0676
www.fuscoe.com
Project Manager:

Steve Ellis, PE.

Date Prepared: June 2023
Revised 1 :

Job Number : 4090-01
NCP Verano, LLC TTM 38710, 38711 & 38712 - VERANO – RIO VISTA VILLAGE

HYDROLOGY AND HYDRAULICS REPORT

VERANO - RIO VISTA VILLAGE
TTM 38710, 38711 & 38712
City of Cathedral City, CA 92234
Riverside County
Prepared for:

NCP VERANO, LLC
690 E Green Street, Suite 200
Pasadena, CA 91101
Tel. (323) 874-8000
Prepared by:

FUSCOE ENGINEERING, INC.
2850 Inland Empire Blvd., Suite B
Ontario, CA 91764
Tel. 909-581-0676
Date Prepared: June 2023
Revision 1 :

Revision 2 :

NCP Verano, LLC TTM 38710, 38711 & 38712 - VERANO – RIO VISTA VILLAGE Table of Contents

1.0 INTRODUCTION .............................................................................................................3

1.1 GEOGRAPHIC SETTING.................................................................................................3

1.2 PURPOSE OF THIS REPORT ............................................................................................3

1.3 REFERENCES..................................................................................................................3

1.4 PROJECT SITE LOCATION MAP ......................................................................................4

1.5 HYDROLOGIC SOILS GROUP MAP FOR CATHEDRAL CITY..............................................5

2.0 PRE-DEVELOPMENT CONDITION.....................................................................................6

2.1 PRE-DEVELOPMENT TOPOGRAPHY ................................................................................6

2.2 PRE-DEVELOPMENT DRAINAGE SYSTEM .........................................................................6

3.0 POST DEVELOPMENT CONDITION..................................................................................6

3.1 POST DEVELOPMENT.....................................................................................................6

3.2 PROPOSED DRAINAGE FACILITY ....................................................................................6

4.0 HYDROLOGY AND HYDRAULIC STUDY............................................................................7

4.1 METHODOLOGY ..........................................................................................................7

5.0 RESULTS AND CONCLUSIONS.........................................................................................7 EXISTING CONDITIONS 10YR & 100 YEAR 24-HR STORM EVENT..............................................8 PROPOSED CONDITIONS 10YR & 100 YEAR 24-HR STORM EVENT ..........................................8 REQUIRED STORAGE USING UNIT HYDROGRAPH:.......................................................................9 SUMMARY OF STORM DRAIN CALCULATIONS (WORST SCENARIO) ..........................................9

6.0 APPENDICES .......................................................................................................................10 Appendix 1 Riverside County Flood Control Hydrology Manual Excepts.

Appendix 2 Unit Hydrograph: Pre and Post Development Conditions for 10yr- and 100yr-24Hr Appendix 3 RCFC & WCD Hydrologic Soil Map (Plate C-1.36) Appendix 4 Autodesk CIVIL3D Hydraflow Unit Hydrograph Calculations (STORAGE) 100yr-24Hr Appendix 5 Hydrology Maps-Pre and Post Development Hydrology Map/ SD-Catch Basin Exhibit Appendix 6 Storm Drain Sizing
Appendix 7 Excerpts from Approved Master Drainage Report for Tract 28639-1 and M-WQMP - Rio Vista Village (For Reference Only)
Appendix 8 Supporting Documents
NCP Verano, LLC TTM 38710, 38711 & 38712 - VERANO – RIO VISTA VILLAGE

1.0 INTRODUCTION

1.1 GEOGRAPHIC SETTING
The proposed Verano project will be part of the master planned community named Rio Vista Village at Cathedral City, California. This report focuses on the portion of the Verano project (herein known as the “project”) that is located within Drainage areas A and B as identified in the Rio Vista Village Master Plan Drainage Alternative report, dated March 2000, and the Drainage Report Tract 28639-1 for Rio Vista Village, dated May 2001. The project encompasses TTM 38711, a portion of TTM 38710, and a portion of TTM 38712. The total project site is approximately 43.78 acres with a net disturbed area of 43.78 acres. It is bounded by an empty lot to the north, Rio Guadalupe Rd to the east, Morongo Stormwater Channel to the west, and Rio Vista Dr and future lots to the south.

The project site is vacant and undeveloped under its existing conditions. Adjacent development surrounding the area site includes single family residences, a stormwater channel, and undeveloped areas. See Figure 1 below for the project location map.

There is no existing storm drain system on site. There are existing Retention Basins A and B located in between Rio Vista Dr that will be utilized for this project. The proposed project consists of the construction of various buildings, landscape areas, drive aisles, sidewalks, parking areas, wall, water quality BMPs and wet/dry utilities.

1.2 PURPOSE OF THIS REPORT
The purpose of this report is to accomplish the following objective:

To determine hydrologic impacts resulting from the proposed development. Impacts are determined based on the comparison between the pre-development condition and the postdevelopment condition. This hydrology report will also provide the peak flow rates for 10-year and 100-year at 24hr duration for post development condition and determine if the proposed storm drain system will be sufficient to convey the runoff generated by the proposed improvements. 100yr-24Hr Storm frequency unit Hydrograph will be used to calculate the runoff volume generated at post condition. Post development condition will upgrade the existing Retention Basins A and B to accommodate the runoff volume per the proposed development.

This will be considered in evaluating the peak flow rate after retention.

1.3 REFERENCES
• Riverside County Flood Control and Water Conservation District (RCFC & WCD) Hydrology Manual
• Approved Master WQMP (M-WQMP) for Rio Vista Village dated April 29, 2015 • Approved Rio Vista Village Master Plan of Drainage Alternative report dated April 5, 2000 • Approved Drainage Report, Tract 28639-1, Rio Vista Village report dated May 4, 2001 NCP Verano, LLC TTM 38710, 38711 & 38712 - VERANO – RIO VISTA VILLAGE

1.4 PROJECT SITE LOCATION MAP
Figure 1
NCP Verano, LLC TTM 38710, 38711 & 38712 - VERANO – RIO VISTA VILLAGE

1.5 HYDROLOGIC SOILS GROUP MAP FOR CATHEDRAL CITY

NCP Verano, LLC TTM 38710, 38711 & 38712 - VERANO – RIO VISTA VILLAGE

2.0 PRE-DEVELOPMENT CONDITION

2.1 PRE-DEVELOPMENT TOPOGRAPHY
The project site is vacant and undeveloped under existing conditions. Adjacent land uses include single family residences, a stormwater channel, and undeveloped property. The pre-development drainage area is approximately 43.03 acres. The overall property moderately slopes downward to the southerly direction towards the existing retention basins.

2.2 PRE-DEVELOPMENT DRAINAGE SYSTEM
The existing site is an undeveloped property with no storm drain system within the site. The project site is located within Drainage areas EX-A (19.50 Ac) and EX-B (23.53Ac) as identified in the Rio Vista Village Master Plan Drainage Alternative report, dated March 2000, and the Drainage Report Tract 28639-1 for Rio Vista Village, dated May 2001. The storm runoff from the site sheet flows towards the southerly direction to the existing retention basins A and B located between Rio Vista Drive. These runoffs will be part of the Whitewater watershed area which will drain to Whitewater River then to the Coachella Valley Storm Water Channel.

3.0 POST DEVELOPMENT CONDITION

3.1 POST DEVELOPMENT
The proposed development includes single-family residences, landscape areas, parking lots, and drive aisles. This proposed development will increase the impervious area of the site to 65%. The post-development drainage area for this development is approximately 43.77 acres. This development will upgrade the existing Retention Basins, A and B, based on the proposed conditions, for treatment control as well as to address flood control requirements. Per the MWQMP, the basins were designed with the capacity to retain for the 100-year, 24-hour storm event which will also be the criteria for upgrade of the basins. This means the design of the existing basin exceed the current NPDES WQMP requirements per Cathedral City Municipal Code Title 8 § 8.24.070 requiring a minimum storage for 100yr-3Hr duration storm event. The Autodesk Civil3D Hydraflow Unit Hydrograph and RCFC & WCD data was utilized to calculate this. Runoff from the proposed development site will sheet flow through the curb and gutters then to the on-site storm drain system and eventually to the proposed retention basins, A and B. A catch basin filter insert will be used as pre-filter.

In addition, the improvements will also include installation of appropriate drainage facilities, other dry and wet utilities, and LID BMPs to mitigate water quality objectives.

3.2 PROPOSED DRAINAGE FACILITY
This post development condition will have two drainage areas as shown on the Post Development Drainage Maps. Drainage area P-A is approximately 11.13 Ac and P-B is 32.64 Ac which will have a total post development drainage area of 43.77 Ac. Drainage P-A decreased it size by

8.37 Ac while Drainage Area P-B increased by 9.11 Ac due to the proposed land development configuration. These drainage areas will respectively drain to its corresponding catch basins then NCP Verano, LLC TTM 38710, 38711 & 38712 - VERANO – RIO VISTA VILLAGE to the on-site storm drain system which will ultimately flow towards the proposed Retention Basins, A and B. Discharge peak flow rates will be calculated per 100yr-24hr storm event. The capacity of the street and catch basins will also be designed per 100-yr storm event. The proposed development peak flow rate must also not exceed pre-development condition at 100yr24h4 storm frequency. This will be achieved by the utilization of the existing retention basins.

Proposed drainage structures and pipes are shown in the Hydrology Maps in Appendix 5.

4.0 HYDROLOGY AND HYDRAULIC STUDY

4.1 METHODOLOGY
This study was prepared in conformance with the Riverside County Hydrology Manual. Autodesk Civil3D Hydraflow Unit Hydrograph Calculator with the rainfall intensity and precipitation data from RCFC & WCD was used to determine the hydrograph volume based on 100-year, 24hr storm duration. Soil type “A” was used for the site per the RCFC & WCD Hydrologic Soil Map for Cathedral City (Plate C-1.36) Methodology and supportive data for the hydrologic calculations may be found in this report, and in the “Riverside County Flood Control and Water Conservation District Hydrology Manual”.

The results of the analysis are included in this report in Appendix 2 and 4.

5.0 RESULTS AND CONCLUSIONS
The purpose of this drainage analysis is to identify the need to keep the post-development runoff volume and peak flow rate the same as the pre-development condition by upgrading the existing retention basin. Riverside County Flood Control District and Water Conservation District requires that the difference in runoff hydrograph volume between the “post-developed” condition and the “pre-developed” condition for the 100hr-24hr storm frequency must be detained on-site. The rainfall volume for the pre-developed condition is 85,427 C.F. and 103,760 C.F. for drainage area EX-A and EX-B, respectively. The post developed rainfall volume is 82,547 C.F and 244,175 C.F. for drainage areas P-A and P-B, respectively. Hence, the difference in pre and post developed runoff volume reduced to -2,880 C.F. for Drainage Area P-A due to smaller drainage area at post development condition while 140,415 C.F. for Drainage Area P-B.

Meanwhile, the capacity of the upgraded retention basins was calculated to be 168,098 C.F. for Basin A and 319,748 C.F. for Basin B, which is adequate to meet flood control requirements.

Furthermore, by utilizing the proposed retention basins, it was noted that the post development peak flow was effectively reduced to 3.94 cfs for Drainage Area A and 7.08 cfs for Drainage Area B at 100yr-24hr storm frequency which is below the existing condition of 13.31 cfs and

13.48 cfs, respectively. Lastly, it has been determined that the proposed storm drain system can convey runoff generated at 100-year storm events. Therefore, the proposed development meets the WQMP and flood requirements for this project and will not result in an adverse effect to the community.

NCP Verano, LLC TTM 38710, 38711 & 38712 - VERANO – RIO VISTA VILLAGE EXISTING CONDITIONS 10YR-24HR & 100YR-24HR STORM EVENT
ID Area
(acre) Tc, min Q10(cfs)
Q100
(cfs)
EX-A 19.50 48.8 1.50 13.31
EX-B 23.53 61.2 1.57 13.48
TOTAL 43.03
PROPOSED CONDITIONS 10YR-24HR & 100YR-24HR STORM EVENT
ID Area
(acre)
Tc,
min
Q10
(cfs)
Q100
(cfs)
P-A1 3.78 41.9 1.50 5.44
P-A2 2.05 38.7 0.86 3.11
P-A3 3.09 29.8 1.60 5.69
P-A4 2.22 20.2 1.36 4.81
TOTAL (P-A) 11.13 5.32 19.05
P-B1 1.09 21.4 0.67 2.37
P-B2 2.12 33.6 1.02 3.66
P-B3 0.99 19.2 0.67 2.34
P-B4 2.00 31.5 0.96 3.45
P-B5 1.42 20.0 0.96 3.36
P-B6 2.11 31.0 1.02 3.64
P-B7 1.30 20.5 0.80 2.83
P-B8 1.95 27.6 1.01 3.59
P-B9 2.67 31.6 1.28 4.61
P-B10 1.55 24.5 0.87 3.06
P-B11 1.55 24.5 0.87 3.06
P-B12 2.53 28.3 1.31 4.66
P-B13 2.28 31.3 1.10 3.93
P-B14 1.46 22.7 0.90 3.17
P-B15 1.46 22.7 0.90 3.17
P-B16 3.05 29.3 1.58 5.62
P-B17 3.11 28.2 0.76 2.69
TOTAL (P-B) 32.64 16.68 59.21
NCP Verano, LLC TTM 38710, 38711 & 38712 - VERANO – RIO VISTA VILLAGE REQUIRED STORAGE USING UNIT HYDROGRAPH:
(100 YR-24HR)
Runoff Volume
Remarks
Drainage Area
A to Basin A
Drainage
Area B to
Basin B
Pre-Development Condition 85,427 cu.ft. 103,760 cu.ft.

Post Development Condition 82,606 cu.ft. 244,175 cu.ft.

DIFFERENCE – PRE vs POST CONDITION -2,821 cu.ft. 140,415 cu.ft.

TOTAL PROVIDED STORAGE RETENTION BASIN –
(PER M-WQMP FOR RIO VISTA VILLAGE: 100YR24HR)

2.38 Ac-ft
103,673 cu. ft.

3.66 Ac-ft
159,430 cu.ft.

CAPACITY OF UPGRADED RETENTION BASINS 168,098 cu. ft. 319,748 cu. ft. Adequate PRE VS POST DEVELOPMENT CONDITION AFTER RETENTION (100YR-24HR)

PRE-CONSTRUCTION VS POST-CONSTRUCTION FLOW SUMMURY BEFORE AND AFTER

RETENTION
Discharge
Location
Total PreDevelopment
Flow Rate,
Q100
Total PostDevelopment
Flow Rate (No
Retention),
Q100
Retention
Volume
Provided
Total PostDevelopment
Flow Rate (After
Retention), Q100
Conclusion
Retention Basin
A

13.31 cfs 19.05 cfs 168,098
cu.ft. 3.94 cfs
Post
development
flow
decreased.

Existing
Retention B

13.48 cfs 59.21 cfs 319,748
cu.ft. 7.08 cfs
Post
development
flow
decreased.

SUMMARY OF STORM DRAIN CALCULATIONS (WORST CASE SCENARIO)

DIAMETER

SLOPE

Q100
(cfs)
Depth
(ft)
Velocity
(ft/s)
18-inch SD S=0.0050 7.23 1.20 4.77
24-inch SD S=0.0050 14.24 1.47 5.74
30-inch SD S=0.0050 25.24 1.80 6.65
36-inch SD S=0.0050 42.31 2.22 7.53
42-inch SD S=0.0050 56.52 2.35 8.20
NCP Verano, LLC TTM 38710, 38711 & 38712 - VERANO – RIO VISTA VILLAGE

6.0 APPENDICES
Appendix 1 Riverside County Flood Control Hydrology Manual Excepts.

Appendix 5 Hydrology Maps-Pre and Post Development Hydrology Map/ SD-Catch Basin Exhibit Appendix 6 Storm Drain Sizing
Appendix 7 Excerpts from Approved Master Drainage Report for Tract 28639-1 and M-WQMP - Rio Vista Village (For Reference Only)
Appendix 8 Supporting Documents

APPENDIX 1

RIVERSIDE COUNTY FLOOD CONTROL
HYDROLOGY MANUAL EXCEPTS.

THE SITE
(0.50")

THE SITE
(0.70")

THE SITE
(0.82")

THE SITE
(1.28")

THE SITE
(1.60")

THE SITE
(2.08")

THE SITE
(2.50")

THE SITE
(4.3")

(ONE HOUR VALUES)
VERANO-CATHEDRAL CITY, CA (24-HOUR VALUES) (1.28) (4.30) (4.00) (3.18) (2.33) (2.04) (6-HOUR VALUES) (2.50) (0.82) (1.13) (1.28) (1.83) (2.11) (33.8527,-116.4777)CATHEDRAL CITY,CA 0.55 1.60 0.81 0.98 1.20 1.40 0.57 RPE 4-03-23 0.50 - 2 YR 0.81 - 5 YR 0.98 - 10 YR 1.20 - 25 YR 1.40 - 50 YR 1.60 -100 YR 0.74 1.10 1.12 1.76 1.45 1.77 2.15 2.65 3.08 3.51 2.07 2.36 2.06 3.02 4.03 4.92 5.75 6.58 S=0.57

Whitewater River Region WQMP Guidance
January 2015 23
Local land use
authority
Ordinance Requirement
Coachella Ordinance #1014
Municipal Code
Section 13.16.110
To minimize the discharge and transport of pollutants, the city requires all new development and redevelopment projects identified as a Priority Project under the newly implemented NPDES permit No. CAS617002 to retain 100% of the stormwater from the 100 year, 24-hour duration storm in order to prevent any deterioration of the water quality which would impair the subsequent or competing uses of water. Projects that retain and infiltrate 100% of the rainfall conditions specified in Section F.1.c.v.4 of the NPDES permit are deemed to comply with the Treatment Control BMP requirements found in that section of the NPDES permit. The NPDES permit establishes acceptable methods and standards for controlling stormwater runoff volumes, rates, and pollutant loading including but not limited to the following:

A. Increase Permeable Areas, Avoid placing impervious surfaces in highly porous soil areas; incorporate landscaping and open space into the project design; use porous materials for or near driveways and walkways; incorporate retention basins that can infiltrate Stormwater onsite; and avoid placing pavement and other impervious surfaces in low lying areas.

B. Direct Runoff to Permeable Areas. Direct Stormwater runoff away from impermeable areas to swales, berms, green strip filters, gravel beds, and French drains; install rain gutters and orient them toward permeable areas; modify the grade of the property to divert flow to permeable areas and minimize the amount of stormwater runoff leaving the property and when designing curbs, berms and other structures, avoid designs which isolate permeable or landscaped areas.

C. Maximize Stormwater Storage for Reuse. Use retention structures, surface areas, cisterns, or other structures to store stormwater Cathedral City Municipal Code – Title 8 §

8.24.070
A. Except as noted below, development of all land within the city must include provisions for the management of stormwater runoff from the property which is to be developed. This management shall consist of constructing stormwater storage facilities, which includes detention basins. As a minimum, all development will make provisions to store runoff from rainfall events up to and including the one-hundred-year, three-hour duration event.

If a suitable outlet for a detention basin is not available, or if engineering analysis indicates that available outlet systems would be overtaxed by detention basin outflow, a retention basin shall be constructed in lieu of a detention basin.

B. The requirement for construction of a detention basin or a retention basin may be waived in the following cases:

1. The runoff has been included in a storage facility at another location. This may include storage facilities proposed as part of the Cathedral City Storm Drain Master Plan;

2. An application for a building permit to construct a single-family residential structure;

3. Development which will drain directly into a floodway or watercourse drainage channel which has been determined by the project review manager, using engineering analyses provided by the development, to have the capacity and be constructed to handle the additional runoff flow without increasing the potential for flood damage on any other downstream property.

4. Development of a parcel under one-half acre in an area where it can be demonstrated by engineering analyses that no significant increase in the potential for flood damage will be created by the development.

APPENDIX 2
UNIT HYDROGRAPH: PRE AND POST
DEVELOPMENT CONDITIONS, 10YR- AND 100YR-24HR

UNIT HYDROGRAPH
PRE-DEVELOPMENT 10YR- AND 100YR-24HR
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 1
4090-01 PRE-DEVT-EX-A UNIT HYDRO-TTM38710&11
Hydrograph type = SCS Runoff Peak discharge = 1.498 cfs Storm frequency = 10 yrs Time to peak = 754 min
Time interval = 2 min Hyd. volume = 16,741 cuft
Drainage area = 19.500 ac Curve number = 65
Basin Slope = 1.8 % Hydraulic length = 1440 ft
Tc method = LAG Time of conc. (Tc) = 48.80 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 PRE-DEVT-EX-A UNIT HYDRO-TTM38710&11
Hyd. No. 1 -- 10 Year
Hyd No. 1
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 1
4090-01 PRE-DEVT-EX-A UNIT HYDRO-TTM38710&11
Hydrograph type = SCS Runoff Peak discharge = 13.31 cfs Storm frequency = 100 yrs Time to peak = 744 min
Time interval = 2 min Hyd. volume = 85,427 cuft
Drainage area = 19.500 ac Curve number = 65
Basin Slope = 1.8 % Hydraulic length = 1440 ft
Tc method = LAG Time of conc. (Tc) = 48.80 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

2.00 2.00

4.00 4.00

6.00 6.00

8.00 8.00

10.00 10.00

12.00 12.00

14.00 14.00
Q (cfs)
Time (min)
4090-01 PRE-DEVT-EX-A UNIT HYDRO-TTM38710&11
Hyd. No. 1 -- 100 Year
Hyd No. 1
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 2
4090-01 PRE-DEVT-EX-B UNIT HYDRO-TTM38710&11
Hydrograph type = SCS Runoff Peak discharge = 1.573 cfs Storm frequency = 10 yrs Time to peak = 768 min
Time interval = 2 min Hyd. volume = 20,334 cuft
Drainage area = 23.530 ac Curve number = 65
Basin Slope = 1.7 % Hydraulic length = 1892 ft
Tc method = LAG Time of conc. (Tc) = 61.23 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 PRE-DEVT-EX-B UNIT HYDRO-TTM38710&11
Hyd. No. 2 -- 10 Year
Hyd No. 2
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 2
4090-01 PRE-DEVT-EX-B UNIT HYDRO-TTM38710&11
Hydrograph type = SCS Runoff Peak discharge = 13.48 cfs Storm frequency = 100 yrs Time to peak = 754 min
Time interval = 2 min Hyd. volume = 103,760 cuft
Drainage area = 23.530 ac Curve number = 65
Basin Slope = 1.7 % Hydraulic length = 1892 ft
Tc method = LAG Time of conc. (Tc) = 61.23 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

2.00 2.00

4.00 4.00

6.00 6.00

8.00 8.00

10.00 10.00

12.00 12.00

14.00 14.00
Q (cfs)
Time (min)
4090-01 PRE-DEVT-EX-B UNIT HYDRO-TTM38710&11
Hyd. No. 2 -- 100 Year
Hyd No. 2
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

UNIT HYDROGRAPH
POST-DEVELOPMENT 10YR- AND 100YR-24HR
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 3
4090-01 P-A1 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 1.500 cfs Storm frequency = 10 yrs Time to peak = 740 min
Time interval = 2 min Hyd. volume = 8,811 cuft
Drainage area = 3.780 ac Curve number = 77
Basin Slope = 1.0 % Hydraulic length = 1287 ft
Tc method = LAG Time of conc. (Tc) = 41.85 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 P-A1 POST DEVT UNIT HYDROGRAPH
Hyd. No. 3 -- 10 Year
Hyd No. 3
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 3
4090-01 P-A1 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 5.442 cfs Storm frequency = 100 yrs Time to peak = 740 min
Time interval = 2 min Hyd. volume = 28,390 cuft
Drainage area = 3.780 ac Curve number = 77
Basin Slope = 1.0 % Hydraulic length = 1287 ft
Tc method = LAG Time of conc. (Tc) = 41.85 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00

5.00 5.00

6.00 6.00
Q (cfs)
Time (min)
4090-01 P-A1 POST DEVT UNIT HYDROGRAPH
Hyd. No. 3 -- 100 Year
Hyd No. 3
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 4
4090-01 P-A2 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 0.862 cfs Storm frequency = 10 yrs Time to peak = 738 min
Time interval = 2 min Hyd. volume = 4,733 cuft
Drainage area = 2.050 ac Curve number = 77
Basin Slope = 1.0 % Hydraulic length = 1167 ft
Tc method = LAG Time of conc. (Tc) = 38.70 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

0.10 0.10

0.20 0.20

0.30 0.30

0.40 0.40

0.50 0.50

0.60 0.60

0.70 0.70

0.80 0.80

0.90 0.90

1.00 1.00
Q (cfs)
Time (min)
4090-01 P-A2 POST DEVT UNIT HYDROGRAPH
Hyd. No. 4 -- 10 Year
Hyd No. 4
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 4
4090-01 P-A2 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 3.112 cfs Storm frequency = 100 yrs Time to peak = 738 min
Time interval = 2 min Hyd. volume = 15,250 cuft
Drainage area = 2.050 ac Curve number = 77
Basin Slope = 1.0 % Hydraulic length = 1167 ft
Tc method = LAG Time of conc. (Tc) = 38.70 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00
Q (cfs)
Time (min)
4090-01 P-A2 POST DEVT UNIT HYDROGRAPH
Hyd. No. 4 -- 100 Year
Hyd No. 4
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 5
4090-01 P-A3 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 1.597 cfs Storm frequency = 10 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 7,134 cuft
Drainage area = 3.090 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 703 ft
Tc method = LAG Time of conc. (Tc) = 29.79 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 P-A3 POST DEVT UNIT HYDROGRAPH
Hyd. No. 5 -- 10 Year
Hyd No. 5
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 5
4090-01 P-A3 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 5.690 cfs Storm frequency = 100 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 22,987 cuft
Drainage area = 3.090 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 703 ft
Tc method = LAG Time of conc. (Tc) = 29.79 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00

5.00 5.00

6.00 6.00
Q (cfs)
Time (min)
4090-01 P-A3 POST DEVT UNIT HYDROGRAPH
Hyd. No. 5 -- 100 Year
Hyd No. 5
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 6
4090-01 P-A4 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 1.362 cfs Storm frequency = 10 yrs Time to peak = 728 min
Time interval = 2 min Hyd. volume = 5,194 cuft
Drainage area = 2.210 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 481 ft
Tc method = LAG Time of conc. (Tc) = 20.25 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 P-A4 POST DEVT UNIT HYDROGRAPH
Hyd. No. 6 -- 10 Year
Hyd No. 6
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 6
4090-01 P-A4 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 4.805 cfs Storm frequency = 100 yrs Time to peak = 726 min
Time interval = 2 min Hyd. volume = 16,734 cuft
Drainage area = 2.210 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 481 ft
Tc method = LAG Time of conc. (Tc) = 20.25 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00

5.00 5.00
Q (cfs)
Time (min)
4090-01 P-A4 POST DEVT UNIT HYDROGRAPH
Hyd. No. 6 -- 100 Year
Hyd No. 6
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 7
4090-01 P-B1 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 0.672 cfs Storm frequency = 10 yrs Time to peak = 728 min
Time interval = 2 min Hyd. volume = 2,562 cuft
Drainage area = 1.090 ac Curve number = 77
Basin Slope = 0.7 % Hydraulic length = 449 ft
Tc method = LAG Time of conc. (Tc) = 21.37 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

0.10 0.10

0.20 0.20

0.30 0.30

0.40 0.40

0.50 0.50

0.60 0.60

0.70 0.70

0.80 0.80

0.90 0.90

1.00 1.00
Q (cfs)
Time (min)
4090-01 P-B1 POST DEVT UNIT HYDROGRAPH
Hyd. No. 7 -- 10 Year
Hyd No. 7
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 7
4090-01 P-B1 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 2.370 cfs Storm frequency = 100 yrs Time to peak = 726 min
Time interval = 2 min Hyd. volume = 8,253 cuft
Drainage area = 1.090 ac Curve number = 77
Basin Slope = 0.7 % Hydraulic length = 449 ft
Tc method = LAG Time of conc. (Tc) = 21.37 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00
Q (cfs)
Time (min)
4090-01 P-B1 POST DEVT UNIT HYDROGRAPH
Hyd. No. 7 -- 100 Year
Hyd No. 7
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 8
4090-01 P-B2 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 1.020 cfs Storm frequency = 10 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 4,956 cuft
Drainage area = 2.120 ac Curve number = 77
Basin Slope = 0.7 % Hydraulic length = 742 ft
Tc method = LAG Time of conc. (Tc) = 33.56 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 P-B2 POST DEVT UNIT HYDROGRAPH
Hyd. No. 8 -- 10 Year
Hyd No. 8
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 8
4090-01 P-B2 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 3.658 cfs Storm frequency = 100 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 15,968 cuft
Drainage area = 2.120 ac Curve number = 77
Basin Slope = 0.7 % Hydraulic length = 742 ft
Tc method = LAG Time of conc. (Tc) = 33.56 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00
Q (cfs)
Time (min)
4090-01 P-B2 POST DEVT UNIT HYDROGRAPH
Hyd. No. 8 -- 100 Year
Hyd No. 8
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 9
4090-01 P-B3 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 0.670 cfs Storm frequency = 10 yrs Time to peak = 726 min
Time interval = 2 min Hyd. volume = 2,286 cuft
Drainage area = 0.990 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 408 ft
Tc method = LAG Time of conc. (Tc) = 19.15 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

0.10 0.10

0.20 0.20

0.30 0.30

0.40 0.40

0.50 0.50

0.60 0.60

0.70 0.70

0.80 0.80

0.90 0.90

1.00 1.00
Q (cfs)
Time (min)
4090-01 P-B3 POST DEVT UNIT HYDROGRAPH
Hyd. No. 9 -- 10 Year
Hyd No. 9
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 9
4090-01 P-B3 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 2.341 cfs Storm frequency = 100 yrs Time to peak = 724 min
Time interval = 2 min Hyd. volume = 7,365 cuft
Drainage area = 0.990 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 408 ft
Tc method = LAG Time of conc. (Tc) = 19.15 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00
Q (cfs)
Time (min)
4090-01 P-B3 POST DEVT UNIT HYDROGRAPH
Hyd. No. 9 -- 100 Year
Hyd No. 9
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 10
4090-01 P-B4 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 0.962 cfs Storm frequency = 10 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 4,675 cuft
Drainage area = 2.000 ac Curve number = 77
Basin Slope = 0.7 % Hydraulic length = 692 ft
Tc method = LAG Time of conc. (Tc) = 31.51 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

0.10 0.10

0.20 0.20

0.30 0.30

0.40 0.40

0.50 0.50

0.60 0.60

0.70 0.70

0.80 0.80

0.90 0.90

1.00 1.00
Q (cfs)
Time (min)
4090-01 P-B4 POST DEVT UNIT HYDROGRAPH
Hyd. No. 10 -- 10 Year
Hyd No. 10
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 10
4090-01 P-B4 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 3.451 cfs Storm frequency = 100 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 15,064 cuft
Drainage area = 2.000 ac Curve number = 77
Basin Slope = 0.7 % Hydraulic length = 692 ft
Tc method = LAG Time of conc. (Tc) = 31.51 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00
Q (cfs)
Time (min)
4090-01 P-B4 POST DEVT UNIT HYDROGRAPH
Hyd. No. 10 -- 100 Year
Hyd No. 10
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 11
4090-01 P-B5 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 0.961 cfs Storm frequency = 10 yrs Time to peak = 726 min
Time interval = 2 min Hyd. volume = 3,279 cuft
Drainage area = 1.420 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 458 ft
Tc method = LAG Time of conc. (Tc) = 20.02 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

0.10 0.10

0.20 0.20

0.30 0.30

0.40 0.40

0.50 0.50

0.60 0.60

0.70 0.70

0.80 0.80

0.90 0.90

1.00 1.00
Q (cfs)
Time (min)
4090-01 P-B5 POST DEVT UNIT HYDROGRAPH
Hyd. No. 11 -- 10 Year
Hyd No. 11
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 11
4090-01 P-B5 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 3.358 cfs Storm frequency = 100 yrs Time to peak = 724 min
Time interval = 2 min Hyd. volume = 10,563 cuft
Drainage area = 1.420 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 458 ft
Tc method = LAG Time of conc. (Tc) = 20.02 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00
Q (cfs)
Time (min)
4090-01 P-B5 POST DEVT UNIT HYDROGRAPH
Hyd. No. 11 -- 100 Year
Hyd No. 11
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 12
4090-01 P-B6 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 1.015 cfs Storm frequency = 10 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 4,933 cuft
Drainage area = 2.110 ac Curve number = 77
Basin Slope = 1.0 % Hydraulic length = 857 ft
Tc method = LAG Time of conc. (Tc) = 30.98 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 P-B6 POST DEVT UNIT HYDROGRAPH
Hyd. No. 12 -- 10 Year
Hyd No. 12
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 12
4090-01 P-B6 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 3.640 cfs Storm frequency = 100 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 15,893 cuft
Drainage area = 2.110 ac Curve number = 77
Basin Slope = 1.0 % Hydraulic length = 857 ft
Tc method = LAG Time of conc. (Tc) = 30.98 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00
Q (cfs)
Time (min)
4090-01 P-B6 POST DEVT UNIT HYDROGRAPH
Hyd. No. 12 -- 100 Year
Hyd No. 12
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 13
4090-01 P-B7 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 0.801 cfs Storm frequency = 10 yrs Time to peak = 728 min
Time interval = 2 min Hyd. volume = 3,055 cuft
Drainage area = 1.300 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 475 ft
Tc method = LAG Time of conc. (Tc) = 20.50 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

0.10 0.10

0.20 0.20

0.30 0.30

0.40 0.40

0.50 0.50

0.60 0.60

0.70 0.70

0.80 0.80

0.90 0.90

1.00 1.00
Q (cfs)
Time (min)
4090-01 P-B7 POST DEVT UNIT HYDROGRAPH
Hyd. No. 13 -- 10 Year
Hyd No. 13
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 13
4090-01 P-B7 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 2.826 cfs Storm frequency = 100 yrs Time to peak = 726 min
Time interval = 2 min Hyd. volume = 9,843 cuft
Drainage area = 1.300 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 475 ft
Tc method = LAG Time of conc. (Tc) = 20.50 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00
Q (cfs)
Time (min)
4090-01 P-B7 POST DEVT UNIT HYDROGRAPH
Hyd. No. 13 -- 100 Year
Hyd No. 13
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 14
4090-01 P-B8 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 1.008 cfs Storm frequency = 10 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 4,502 cuft
Drainage area = 1.950 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 669 ft
Tc method = LAG Time of conc. (Tc) = 27.59 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 P-B8 POST DEVT UNIT HYDROGRAPH
Hyd. No. 14 -- 10 Year
Hyd No. 14
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 14
4090-01 P-B8 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 3.591 cfs Storm frequency = 100 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 14,506 cuft
Drainage area = 1.950 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 669 ft
Tc method = LAG Time of conc. (Tc) = 27.59 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00
Q (cfs)
Time (min)
4090-01 P-B8 POST DEVT UNIT HYDROGRAPH
Hyd. No. 14 -- 100 Year
Hyd No. 14
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 15
4090-01 P-B9 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 1.284 cfs Storm frequency = 10 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 6,242 cuft
Drainage area = 2.670 ac Curve number = 77
Basin Slope = 0.7 % Hydraulic length = 725 ft
Tc method = LAG Time of conc. (Tc) = 31.56 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 P-B9 POST DEVT UNIT HYDROGRAPH
Hyd. No. 15 -- 10 Year
Hyd No. 15
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 15
4090-01 P-B9 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 4.606 cfs Storm frequency = 100 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 20,111 cuft
Drainage area = 2.670 ac Curve number = 77
Basin Slope = 0.7 % Hydraulic length = 725 ft
Tc method = LAG Time of conc. (Tc) = 31.56 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00

5.00 5.00
Q (cfs)
Time (min)
4090-01 P-B9 POST DEVT UNIT HYDROGRAPH
Hyd. No. 15 -- 100 Year
Hyd No. 15
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 16
4090-01 P-B10 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 0.865 cfs Storm frequency = 10 yrs Time to peak = 730 min
Time interval = 2 min Hyd. volume = 3,523 cuft
Drainage area = 1.550 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 578 ft
Tc method = LAG Time of conc. (Tc) = 24.55 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

0.10 0.10

0.20 0.20

0.30 0.30

0.40 0.40

0.50 0.50

0.60 0.60

0.70 0.70

0.80 0.80

0.90 0.90

1.00 1.00
Q (cfs)
Time (min)
4090-01 P-B10 POST DEVT UNIT HYDROGRAPH
Hyd. No. 16 -- 10 Year
Hyd No. 16
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 16
4090-01 P-B10 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 3.065 cfs Storm frequency = 100 yrs Time to peak = 728 min
Time interval = 2 min Hyd. volume = 11,350 cuft
Drainage area = 1.550 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 578 ft
Tc method = LAG Time of conc. (Tc) = 24.55 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00
Q (cfs)
Time (min)
4090-01 P-B10 POST DEVT UNIT HYDROGRAPH
Hyd. No. 16 -- 100 Year
Hyd No. 16
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 17
4090-01 P-B11 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 0.865 cfs Storm frequency = 10 yrs Time to peak = 730 min
Time interval = 2 min Hyd. volume = 3,523 cuft
Drainage area = 1.550 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 578 ft
Tc method = LAG Time of conc. (Tc) = 24.55 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

0.10 0.10

0.20 0.20

0.30 0.30

0.40 0.40

0.50 0.50

0.60 0.60

0.70 0.70

0.80 0.80

0.90 0.90

1.00 1.00
Q (cfs)
Time (min)
4090-01 P-B11 POST DEVT UNIT HYDROGRAPH
Hyd. No. 17 -- 10 Year
Hyd No. 17
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 17
4090-01 P-B11 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 3.065 cfs Storm frequency = 100 yrs Time to peak = 728 min
Time interval = 2 min Hyd. volume = 11,350 cuft
Drainage area = 1.550 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 578 ft
Tc method = LAG Time of conc. (Tc) = 24.55 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00
Q (cfs)
Time (min)
4090-01 P-B11 POST DEVT UNIT HYDROGRAPH
Hyd. No. 17 -- 100 Year
Hyd No. 17
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 18
4090-01 P-B12 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 1.307 cfs Storm frequency = 10 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 5,841 cuft
Drainage area = 2.530 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 746 ft
Tc method = LAG Time of conc. (Tc) = 28.31 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 P-B12 POST DEVT UNIT HYDROGRAPH
Hyd. No. 18 -- 10 Year
Hyd No. 18
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 18
4090-01 P-B12 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 4.659 cfs Storm frequency = 100 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 18,821 cuft
Drainage area = 2.530 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 746 ft
Tc method = LAG Time of conc. (Tc) = 28.31 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00

5.00 5.00
Q (cfs)
Time (min)
4090-01 P-B12 POST DEVT UNIT HYDROGRAPH
Hyd. No. 18 -- 100 Year
Hyd No. 18
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 19
4090-01 P-B13 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 1.096 cfs Storm frequency = 10 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 5,330 cuft
Drainage area = 2.280 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 790 ft
Tc method = LAG Time of conc. (Tc) = 31.33 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 P-B13 POST DEVT UNIT HYDROGRAPH
Hyd. No. 19 -- 10 Year
Hyd No. 19
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 19
4090-01 P-B13 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 3.934 cfs Storm frequency = 100 yrs Time to peak = 734 min
Time interval = 2 min Hyd. volume = 17,173 cuft
Drainage area = 2.280 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 790 ft
Tc method = LAG Time of conc. (Tc) = 31.33 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00
Q (cfs)
Time (min)
4090-01 P-B13 POST DEVT UNIT HYDROGRAPH
Hyd. No. 19 -- 100 Year
Hyd No. 19
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 20
4090-01 P-B14 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 0.900 cfs Storm frequency = 10 yrs Time to peak = 728 min
Time interval = 2 min Hyd. volume = 3,431 cuft
Drainage area = 1.460 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 542 ft
Tc method = LAG Time of conc. (Tc) = 22.65 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

0.10 0.10

0.20 0.20

0.30 0.30

0.40 0.40

0.50 0.50

0.60 0.60

0.70 0.70

0.80 0.80

0.90 0.90

1.00 1.00
Q (cfs)
Time (min)
4090-01 P-B14 POST DEVT UNIT HYDROGRAPH
Hyd. No. 20 -- 10 Year
Hyd No. 20
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 20
4090-01 P-B14 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 3.174 cfs Storm frequency = 100 yrs Time to peak = 726 min
Time interval = 2 min Hyd. volume = 11,055 cuft
Drainage area = 1.460 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 542 ft
Tc method = LAG Time of conc. (Tc) = 22.65 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00
Q (cfs)
Time (min)
4090-01 P-B14 POST DEVT UNIT HYDROGRAPH
Hyd. No. 20 -- 100 Year
Hyd No. 20
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 21
4090-01 P-B15 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 0.900 cfs Storm frequency = 10 yrs Time to peak = 728 min
Time interval = 2 min Hyd. volume = 3,431 cuft
Drainage area = 1.460 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 542 ft
Tc method = LAG Time of conc. (Tc) = 22.65 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

0.10 0.10

0.20 0.20

0.30 0.30

0.40 0.40

0.50 0.50

0.60 0.60

0.70 0.70

0.80 0.80

0.90 0.90

1.00 1.00
Q (cfs)
Time (min)
4090-01 P-B15 POST DEVT UNIT HYDROGRAPH
Hyd. No. 21 -- 10 Year
Hyd No. 21
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 21
4090-01 P-B15 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 3.174 cfs Storm frequency = 100 yrs Time to peak = 726 min
Time interval = 2 min Hyd. volume = 11,055 cuft
Drainage area = 1.460 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 542 ft
Tc method = LAG Time of conc. (Tc) = 22.65 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00
Q (cfs)
Time (min)
4090-01 P-B15 POST DEVT UNIT HYDROGRAPH
Hyd. No. 21 -- 100 Year
Hyd No. 21
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 22
4090-01 P-B16 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 1.576 cfs Storm frequency = 10 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 7,042 cuft
Drainage area = 3.050 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 711 ft
Tc method = LAG Time of conc. (Tc) = 29.32 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00
Q (cfs)
Time (min)
4090-01 P-B16 POST DEVT UNIT HYDROGRAPH
Hyd. No. 22 -- 10 Year
Hyd No. 22
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 22
4090-01 P-B16 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 5.616 cfs Storm frequency = 100 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 22,689 cuft
Drainage area = 3.050 ac Curve number = 77
Basin Slope = 0.8 % Hydraulic length = 711 ft
Tc method = LAG Time of conc. (Tc) = 29.32 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00

5.00 5.00

6.00 6.00
Q (cfs)
Time (min)
4090-01 P-B16 POST DEVT UNIT HYDROGRAPH
Hyd. No. 22 -- 100 Year
Hyd No. 22
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

Rainfall Precipitation Table (in)
me: F:\Projects\4090\001\_Support Files\Reports\Hydrology\TTM - 38710 & 38711\Calculation\4090-01 Precipitation.pcp Storm
Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 1.28 0.00 2.04 2.33 3.18 4.00 4.30
SCS 6-Hr 0.00 0.82 0.00 1.13 1.28 1.83 2.11 2.50
Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 23
4090-01 P-B17 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 0.755 cfs Storm frequency = 10 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 3,371 cuft
Drainage area = 1.460 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 699 ft
Tc method = LAG Time of conc. (Tc) = 28.24 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
1 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

0.10 0.10

0.20 0.20

0.30 0.30

0.40 0.40

0.50 0.50

0.60 0.60

0.70 0.70

0.80 0.80

0.90 0.90

1.00 1.00
Q (cfs)
Time (min)
4090-01 P-B17 POST DEVT UNIT HYDROGRAPH
Hyd. No. 23 -- 10 Year
Hyd No. 23
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Hyd. No. 23
4090-01 P-B17 POST DEVT UNIT HYDROGRAPH
Hydrograph type = SCS Runoff Peak discharge = 2.688 cfs Storm frequency = 100 yrs Time to peak = 732 min
Time interval = 2 min Hyd. volume = 10,861 cuft
Drainage area = 1.460 ac Curve number = 77
Basin Slope = 0.9 % Hydraulic length = 699 ft
Tc method = LAG Time of conc. (Tc) = 28.24 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00
Q (cfs)
Time (min)
4090-01 P-B17 POST DEVT UNIT HYDROGRAPH
Hyd. No. 23 -- 100 Year
Hyd No. 23
Hydraflow Rainfall Report
3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Monday, 06 / 5 / 2023 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period
(Yrs) B D E (N/A)
1 0.0000 0.0000 0.0000 --------
2 5.0994 0.1000 0.5670 --------
3 0.0000 0.0000 0.0000 --------
5 5.5223 0.1000 0.4686 --------
10 9.9784 0.1000 0.5666 --------
25 10.1229 0.1000 0.5206 --------
50 14.1968 0.1000 0.5656 --------
100 15.9941 0.1000 0.5621 --------
File name: 4090-01 Intensity.IDF
Intensity = B / (Tc + D)^E
Return Intensity Values (in/hr)
Period
(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60
1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.02 1.37 1.09 0.93 0.82 0.74 0.68 0.63 0.59 0.55 0.53 0.50 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 2.57 1.87 1.55 1.35 1.22 1.12 1.04 0.98 0.93 0.88 0.84 0.81 10 3.96 2.69 2.14 1.82 1.61 1.45 1.33 1.23 1.15 1.09 1.03 0.98 25 4.33 3.04 2.46 2.12 1.89 1.72 1.59 1.48 1.39 1.32 1.26 1.20 50 5.65 3.84 3.06 2.60 2.29 2.07 1.90 1.76 1.65 1.55 1.47 1.40 100 6.40 4.36 3.48 2.96 2.61 2.36 2.16 2.01 1.88 1.77 1.68 1.60 Tc = time in minutes. Values may exceed 60.

APPENDIX 3

RCFC & WCD HYDROLOGIC SOIL MAP
(PLATE C-1.35)

THE SITE
Soil Map—Riverside County, Coachella Valley Area, California (TTM 38711 & 38712-VERANO)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 1 of 3 ends

3746640 3746570 3746500 3746430 3746360 3746290 3746220 3746640 3746570 3746500 3746430 3746360 3746290 3746220 546930 547000 547070 547140 547210 547280 547350 547420 547490 547560 546930 547000 547070 547140 547210 547280 547350 547420 547490 547560 33° 51' 33'' N
116° 29' 34'' W
33° 51' 33'' N
116° 29' 7'' W
33° 51' 18'' N
116° 29' 34'' W
33° 51' 18'' N
116° 29' 7'' W
N
0 150 300 600 900
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 11N WGS84 Feet
0 45 90 180 270
Meters
Map Scale: 1:3,170 if printed on A landscape (11" x 8.5") sheet.

Soil Map may not be valid at this scale.

Warning: Soil Map may not be valid at this scale.

Please rely on the bar scale on each map sheet for map
measurements.

Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:

This product is generated from the USDA-NRCS certified data as of the version date(s) listed below.

Soil Survey Area: Riverside County, Coachella Valley Area, California
Survey Area Data: Version 14, Sep 1, 2022
Soil map units are labeled (as space allows) for map scales 1:50,000 or larger.

Soil Map—Riverside County, Coachella Valley Area, California (TTM 38711 & 38712-VERANO)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 2 of 3 ends

Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI CdC Carsitas gravelly sand, 0 to 9
percent slopes

0.0 0.1%
ChC Carsitas cobbly sand, 2 to 9
percent slopes

26.5 72.1%
CkB Carsitas fine sand, 0 to 5
percent slopes

10.2 27.8%
Totals for Area of Interest 36.7 100.0%
Soil Map—Riverside County, Coachella Valley Area, California TTM 38711 & 38712-VERANO Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 3 of 3 ends

Description of Carsitas
Setting
Landform: Alluvial fans
Landform position (two-dimensional): Footslope
Landform position (three-dimensional): Tread
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Gravelly alluvium derived from granite Typical profile
H1 - 0 to 10 inches: gravelly sand
H2 - 10 to 60 inches: gravelly sand
Properties and qualities
Slope: 0 to 9 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Excessively drained
Runoff class: Very low
Capacity of the most limiting layer to transmit water (Ksat): High to very high (5.95 to 19.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 1 percent
Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm)
Available water supply, 0 to 60 inches: Very low (about 3.0 inches) Interpretive groups
Land capability classification (irrigated): 4s
Land capability classification (nonirrigated): 7e
Hydrologic Soil Group: A
Ecological site: R040XD200CA - Rarely Flooded Fans
Map Unit Description: Carsitas gravelly sand, 0 to 9 percent slopes---Riverside County, Coachella Valley Area, California
TTM 38711 & 38712-VERANO
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 1 of 2 ends

Hydric soil rating: No
Minor Components
Myoma
Percent of map unit: 4 percent
Hydric soil rating: No
Riverwash
Percent of map unit: 4 percent
Landform: Channels
Hydric soil rating: Yes
Carsitas
Percent of map unit: 4 percent
Hydric soil rating: No
Unnamed, stony or gravelly
Percent of map unit: 3 percent
Hydric soil rating: No
Data Source Information
Soil Survey Area: Riverside County, Coachella Valley Area, California Survey Area Data: Version 14, Sep 1, 2022
Map Unit Description: Carsitas gravelly sand, 0 to 9 percent slopes---Riverside County, Coachella Valley Area, California
TTM 38711 & 38712-VERANO
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 2 of 2 ends

Description of Carsitas
Setting
Landform: Alluvial fans
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Gravelly alluvium derived from granite Typical profile
H1 - 0 to 10 inches: cobbly sand
H2 - 10 to 60 inches: gravelly sand
Properties and qualities
Slope: 2 to 9 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Excessively drained
Runoff class: Very low
Capacity of the most limiting layer to transmit water (Ksat): High to very high (5.95 to 19.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 1 percent
Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm)
Available water supply, 0 to 60 inches: Very low (about 3.0 inches) Interpretive groups
Land capability classification (irrigated): 6s
Land capability classification (nonirrigated): 7e
Hydrologic Soil Group: A
Ecological site: R040XD200CA - Rarely Flooded Fans
Map Unit Description: Carsitas cobbly sand, 2 to 9 percent slopes---Riverside County, Coachella Valley Area, California
TTM 38711 & 38712-VERANO
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 1 of 2 ends

Hydric soil rating: No
Minor Components
Chuckawalla
Percent of map unit: 4 percent
Hydric soil rating: No
Riverwash
Percent of map unit: 4 percent
Landform: Channels
Hydric soil rating: Yes
Carrizo
Percent of map unit: 4 percent
Hydric soil rating: No
Unnamed
Percent of map unit: 3 percent
Hydric soil rating: No
Data Source Information
Soil Survey Area: Riverside County, Coachella Valley Area, California Survey Area Data: Version 14, Sep 1, 2022
Map Unit Description: Carsitas cobbly sand, 2 to 9 percent slopes---Riverside County, Coachella Valley Area, California
TTM 38711 & 38712-VERANO
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 2 of 2 ends

Riverside County, Coachella Valley Area, California
CkB—Carsitas fine sand, 0 to 5 percent slopes
Map Unit Setting
National map unit symbol: hkv4
Elevation: 800 feet
Mean annual precipitation: 4 inches
Mean annual air temperature: 72 to 73 degrees F
Frost-free period: 275 to 325 days
Farmland classification: Not prime farmland
Map Unit Composition
Carsitas and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.

Description of Carsitas
Setting
Landform: Alluvial fans
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Tread
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Sandy alluvium derived from granite
Typical profile
H1 - 0 to 10 inches: fine sand
H2 - 10 to 60 inches: gravelly sand
Properties and qualities
Slope: 0 to 5 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Excessively drained
Runoff class: Negligible
Capacity of the most limiting layer to transmit water (Ksat): High to very high (5.95 to 19.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 1 percent
Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm)
Available water supply, 0 to 60 inches: Low (about 3.1 inches) Interpretive groups
Land capability classification (irrigated): 4e
Land capability classification (nonirrigated): 7e
Hydrologic Soil Group: A
Ecological site: R040XD200CA - Rarely Flooded Fans
Map Unit Description: Carsitas fine sand, 0 to 5 percent slopes---Riverside County, Coachella Valley Area, California
TTM 38711 & 38712-VERANO
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 1 of 2 ends

Hydric soil rating: No
Minor Components
Myoma
Percent of map unit: 10 percent
Hydric soil rating: No
Coachella
Percent of map unit: 3 percent
Hydric soil rating: No
Unnamed, gravel surface
Percent of map unit: 2 percent
Hydric soil rating: No
Data Source Information
Soil Survey Area: Riverside County, Coachella Valley Area, California Survey Area Data: Version 14, Sep 1, 2022
Map Unit Description: Carsitas fine sand, 0 to 5 percent slopes---Riverside County, Coachella Valley Area, California
TTM 38711 & 38712-VERANO
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2023

Page 2 of 2 ends

APPENDIX 4

HYDRAFLOW UNIT HYDROGRAPH CALCULATIONS
STORAGE REQUIREMENT, 100YR-24HR
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Wednesday, 06 / 7 / 2023 Hyd. No. 25
4090-01 P-A POST DEVT OVERALL UH
Hydrograph type = SCS Runoff Peak discharge = 5.360 cfs Storm frequency = 10 yrs Time to peak = 12.33 hrs
Time interval = 2 min Hyd. volume = 25,638 cuft
Drainage area = 11.130 ac Curve number = 77
Basin Slope = 1.9 % Hydraulic length = 1961 ft
Tc method = LAG Time of conc. (Tc) = 43.83 min
Total precip. = 2.33 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 620
1 0 2 4 6 8 10 12 14 16 18 20 22 24 26
Q (cfs)

0.00 0.00

1.00 1.00

2.00 2.00

3.00 3.00

4.00 4.00

5.00 5.00

6.00 6.00
Q (cfs)
Time (hrs)
4090-01 P-A POST DEVT OVERALL UH
Hyd. No. 25 -- 10 Year
Hyd No. 25
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Wednesday, 06 / 7 / 2023 Hyd. No. 25
4090-01 P-A POST DEVT OVERALL UH
Hydrograph type = SCS Runoff Peak discharge = 19.05 cfs Storm frequency = 100 yrs Time to peak = 12.30 hrs
Time interval = 2 min Hyd. volume = 82,606 cuft
Drainage area = 11.130 ac Curve number = 77
Basin Slope = 1.9 % Hydraulic length = 1961 ft
Tc method = LAG Time of conc. (Tc) = 43.83 min
Total precip. = 4.30 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 620
2 0 2 4 6 8 10 12 14 16 18 20 22 24 26
Q (cfs)

0.00 0.00

3.00 3.00

6.00 6.00

9.00 9.00

12.00 12.00

15.00 15.00

18.00 18.00

21.00 21.00
Q (cfs)
Time (hrs)
4090-01 P-A POST DEVT OVERALL UH
Hyd. No. 25 -- 100 Year
Hyd No. 25
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Wednesday, 06 / 7 / 2023 Hyd. No. 28

RETENTION BASIN, A
Hydrograph type = Reservoir Peak discharge = 3.944 cfs
Storm frequency = 100 yrs Time to peak = 12.83 hrs
Time interval = 2 min Hyd. volume = 82,602 cuft
Inflow hyd. No. = 25 - 4090-01 P-A POST DEVT OVERALL UHMax. Elevation = 461.39 ft Reservoir name = RETENTION BASIN, A Max. Storage = 34,208 cuft Storage Indication method used. Outflow includes exfiltration. 1 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28
Q (cfs)

0.00 0.00

3.00 3.00

6.00 6.00

9.00 9.00

12.00 12.00

15.00 15.00

18.00 18.00

21.00 21.00
Q (cfs)
Time (hrs)

RETENTION BASIN, A
Hyd. No. 28 -- 100 Year
Hyd No. 28 Hyd No. 25 Total storage used = 34,208 cuft
Pond Report 2
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Wednesday, 06 / 7 / 2023 Pond No. 2 - RETENTION BASIN, A
Pond Data
Contours -User-defined contour areas. Conic method used for volume calculation. Begining Elevation = 459.00 ft Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft)

0.00 459.00 9,349 0 0

1.00 460.00 13,312 11,271 11,271

2.00 461.00 17,404 15,311 26,582

3.00 462.00 21,623 19,473 46,055

4.00 463.00 25,971 23,761 69,817

5.00 464.00 30,446 28,176 97,993

6.00 465.00 35,050 32,718 130,711

7.00 466.00 39,781 37,387 168,098
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [PrfRsr] [A] [B] [C] [D]
Rise (in) = 0.00 0.00 0.00 0.00
Span (in) = 0.00 0.00 0.00 0.00
No. Barrels = 1 0 0 0
Invert El. (ft) = 459.00 0.00 0.00 0.00
Length (ft) = 0.00 0.00 0.00 0.00
Slope (%) = 0.00 0.00 0.00 n/a
N-Value = .013 .013 .013 n/a
Orifice Coeff. = 0.60 0.60 0.60 0.60
Multi-Stage = n/a No No No
Crest Len (ft) = 0.00 0.00 0.00 0.00
Crest El. (ft) = 0.00 0.00 0.00 0.00
Weir Coeff. = 3.33 3.33 3.33 3.33
Weir Type = --- --- --- ---
Multi-Stage = No No No No
Exfil.(in/hr) = 8.940 (by Contour)
TW Elev. (ft) = 0.00
Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s).

Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Clv C PrfRsr Wr A Wr B Wr C Wr D Exfil User Total ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

0.00 0 459.00 --- --- --- --- --- --- --- --- 0.000 --- 0.000

0.10 1,127 459.10 --- --- --- --- --- --- --- --- 0.275 --- 0.275

0.20 2,254 459.20 --- --- --- --- --- --- --- --- 0.551 --- 0.551

0.30 3,381 459.30 --- --- --- --- --- --- --- --- 0.826 --- 0.826

0.40 4,508 459.40 --- --- --- --- --- --- --- --- 1.102 --- 1.102

0.50 5,636 459.50 --- --- --- --- --- --- --- --- 1.377 --- 1.377

0.60 6,763 459.60 --- --- --- --- --- --- --- --- 1.653 --- 1.653

0.70 7,890 459.70 --- --- --- --- --- --- --- --- 1.928 --- 1.928

0.80 9,017 459.80 --- --- --- --- --- --- --- --- 2.204 --- 2.204

0.90 10,144 459.90 --- --- --- --- --- --- --- --- 2.479 --- 2.479

1.00 11,271 460.00 --- --- --- --- --- --- --- --- 2.755 --- 2.755

1.10 12,802 460.10 --- --- --- --- --- --- --- --- 2.840 --- 2.840

1.20 14,333 460.20 --- --- --- --- --- --- --- --- 2.924 --- 2.924

1.30 15,864 460.30 --- --- --- --- --- --- --- --- 3.009 --- 3.009

1.40 17,396 460.40 --- --- --- --- --- --- --- --- 3.094 --- 3.094

1.50 18,927 460.50 --- --- --- --- --- --- --- --- 3.178 --- 3.178

1.60 20,458 460.60 --- --- --- --- --- --- --- --- 3.263 --- 3.263

1.70 21,989 460.70 --- --- --- --- --- --- --- --- 3.348 --- 3.348

1.80 23,520 460.80 --- --- --- --- --- --- --- --- 3.432 --- 3.432

1.90 25,051 460.90 --- --- --- --- --- --- --- --- 3.517 --- 3.517

2.00 26,582 461.00 --- --- --- --- --- --- --- --- 3.602 --- 3.602

2.10 28,529 461.10 --- --- --- --- --- --- --- --- 3.689 --- 3.689

2.20 30,477 461.20 --- --- --- --- --- --- --- --- 3.776 --- 3.776

2.30 32,424 461.30 --- --- --- --- --- --- --- --- 3.864 --- 3.864

2.40 34,371 461.40 --- --- --- --- --- --- --- --- 3.951 --- 3.951

2.50 36,319 461.50 --- --- --- --- --- --- --- --- 4.038 --- 4.038

2.60 38,266 461.60 --- --- --- --- --- --- --- --- 4.125 --- 4.125

2.70 40,213 461.70 --- --- --- --- --- --- --- --- 4.213 --- 4.213

2.80 42,161 461.80 --- --- --- --- --- --- --- --- 4.300 --- 4.300

2.90 44,108 461.90 --- --- --- --- --- --- --- --- 4.387 --- 4.387

3.00 46,055 462.00 --- --- --- --- --- --- --- --- 4.475 --- 4.475

3.10 48,432 462.10 --- --- --- --- --- --- --- --- 4.565 --- 4.565

3.20 50,808 462.20 --- --- --- --- --- --- --- --- 4.655 --- 4.655

3.30 53,184 462.30 --- --- --- --- --- --- --- --- 4.745 --- 4.745

3.40 55,560 462.40 --- --- --- --- --- --- --- --- 4.835 --- 4.835 Continues on next page...
3 RETENTION BASIN, A
Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Clv C PrfRsr Wr A Wr B Wr C Wr D Exfil User Total ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

3.50 57,936 462.50 --- --- --- --- --- --- --- --- 4.925 --- 4.925

3.60 60,312 462.60 --- --- --- --- --- --- --- --- 5.015 --- 5.015

3.70 62,688 462.70 --- --- --- --- --- --- --- --- 5.105 --- 5.105

3.80 65,065 462.80 --- --- --- --- --- --- --- --- 5.195 --- 5.195

3.90 67,441 462.90 --- --- --- --- --- --- --- --- 5.285 --- 5.285

4.00 69,817 463.00 --- --- --- --- --- --- --- --- 5.375 --- 5.375

4.10 72,635 463.10 --- --- --- --- --- --- --- --- 5.467 --- 5.467

4.20 75,452 463.20 --- --- --- --- --- --- --- --- 5.560 --- 5.560

4.30 78,270 463.30 --- --- --- --- --- --- --- --- 5.652 --- 5.652

4.40 81,087 463.40 --- --- --- --- --- --- --- --- 5.745 --- 5.745

4.50 83,905 463.50 --- --- --- --- --- --- --- --- 5.838 --- 5.838

4.60 86,723 463.60 --- --- --- --- --- --- --- --- 5.930 --- 5.930

4.70 89,540 463.70 --- --- --- --- --- --- --- --- 6.023 --- 6.023

4.80 92,358 463.80 --- --- --- --- --- --- --- --- 6.115 --- 6.115

4.90 95,175 463.90 --- --- --- --- --- --- --- --- 6.208 --- 6.208

5.00 97,993 464.00 --- --- --- --- --- --- --- --- 6.301 --- 6.301

5.10 101,265 464.10 --- --- --- --- --- --- --- --- 6.396 --- 6.396

5.20 104,537 464.20 --- --- --- --- --- --- --- --- 6.491 --- 6.491

5.30 107,808 464.30 --- --- --- --- --- --- --- --- 6.586 --- 6.586

5.40 111,080 464.40 --- --- --- --- --- --- --- --- 6.682 --- 6.682

5.50 114,352 464.50 --- --- --- --- --- --- --- --- 6.777 --- 6.777

5.60 117,624 464.60 --- --- --- --- --- --- --- --- 6.872 --- 6.872

5.70 120,895 464.70 --- --- --- --- --- --- --- --- 6.968 --- 6.968

5.80 124,167 464.80 --- --- --- --- --- --- --- --- 7.063 --- 7.063

5.90 127,439 464.90 --- --- --- --- --- --- --- --- 7.158 --- 7.158

6.00 130,711 465.00 --- --- --- --- --- --- --- --- 7.253 --- 7.253

6.10 134,449 465.10 --- --- --- --- --- --- --- --- 7.351 --- 7.351

6.20 138,188 465.20 --- --- --- --- --- --- --- --- 7.449 --- 7.449

6.30 141,927 465.30 --- --- --- --- --- --- --- --- 7.547 --- 7.547

6.40 145,665 465.40 --- --- --- --- --- --- --- --- 7.645 --- 7.645

6.50 149,404 465.50 --- --- --- --- --- --- --- --- 7.743 --- 7.743

6.60 153,143 465.60 --- --- --- --- --- --- --- --- 7.841 --- 7.841

6.70 156,882 465.70 --- --- --- --- --- --- --- --- 7.939 --- 7.939

6.80 160,620 465.80 --- --- --- --- --- --- --- --- 8.037 --- 8.037

6.90 164,359 465.90 --- --- --- --- --- --- --- --- 8.134 --- 8.134

7.00 168,098 466.00 --- --- --- --- --- --- --- --- 8.232 --- 8.232 ...End
Hydrograph Report
1 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Wednesday, 06 / 7 / 2023 Hyd. No. 28

RETENTION BASIN, A
Hydrograph type = Reservoir Peak discharge = 3.944 cfs
Storm frequency = 100 yrs Time to peak = 12.83 hrs
Time interval = 2 min Hyd. volume = 82,602 cuft
Inflow hyd. No. = 25 - 4090-01 P-A POST DEVT OVERALL UHReservoir name = RETENTION BASIN, Max. Elevation = 461.39 ft Max. Storage = 34,208 cuft
Storage Indication method used. Outflow includes exfiltration.

Hydrograph Discharge Table ( Printed values >= 1.00% of Qp.) Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

10.07 0.132 459.01 ----- ----- ----- ----- ----- ----- ----- ----- 0.040 0.039

10.10 0.139 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.042 0.042

10.13 0.146 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.045 0.045

10.17 0.153 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.048 0.048

10.20 0.161 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.051 0.051

10.23 0.168 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.055 0.055

10.27 0.177 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.058 0.058

10.30 0.185 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.062 0.062

10.33 0.194 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.065 0.065

10.37 0.203 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.069 0.069

10.40 0.213 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.073 0.073

10.43 0.223 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.077 0.077

10.47 0.233 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.082 0.082

10.50 0.244 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.086 0.086

10.53 0.255 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.091 0.091

10.57 0.267 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.096 0.096

10.60 0.279 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.101 0.101

10.63 0.291 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.106 0.106

10.67 0.304 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.112 0.112

10.70 0.318 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.118 0.118 Continues on next page...
2 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

10.73 0.332 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.123 0.123

10.77 0.347 459.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.130 0.130

10.80 0.362 459.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.136 0.136

10.83 0.378 459.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.143 0.143

10.87 0.395 459.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.150 0.150

10.90 0.413 459.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.157 0.157

10.93 0.431 459.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.165 0.165

10.97 0.450 459.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.173 0.173

11.00 0.471 459.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.181 0.181

11.03 0.492 459.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.190 0.190

11.07 0.514 459.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.199 0.199

11.10 0.537 459.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.208 0.208

11.13 0.561 459.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.218 0.218

11.17 0.587 459.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.229 0.229

11.20 0.615 459.09 ----- ----- ----- ----- ----- ----- ----- ----- 0.239 0.239

11.23 0.644 459.09 ----- ----- ----- ----- ----- ----- ----- ----- 0.251 0.251

11.27 0.675 459.10 ----- ----- ----- ----- ----- ----- ----- ----- 0.262 0.262

11.30 0.709 459.10 ----- ----- ----- ----- ----- ----- ----- ----- 0.275 0.275

11.33 0.744 459.10 ----- ----- ----- ----- ----- ----- ----- ----- 0.288 0.288

11.37 0.782 459.11 ----- ----- ----- ----- ----- ----- ----- ----- 0.302 0.302

11.40 0.823 459.11 ----- ----- ----- ----- ----- ----- ----- ----- 0.316 0.316

11.43 0.867 459.12 ----- ----- ----- ----- ----- ----- ----- ----- 0.331 0.331

11.47 0.913 459.13 ----- ----- ----- ----- ----- ----- ----- ----- 0.348 0.348

11.50 0.963 459.13 ----- ----- ----- ----- ----- ----- ----- ----- 0.365 0.365

11.53 1.018 459.14 ----- ----- ----- ----- ----- ----- ----- ----- 0.383 0.383

11.57 1.087 459.15 ----- ----- ----- ----- ----- ----- ----- ----- 0.402 0.402

11.60 1.178 459.15 ----- ----- ----- ----- ----- ----- ----- ----- 0.423 0.423

11.63 1.298 459.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.447 0.447 Continues on next page...
3 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

11.67 1.459 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.474 0.474

11.70 1.671 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.505 0.505

11.73 1.946 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.543 0.543

11.77 2.301 459.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.589 0.589

11.80 2.769 459.23 ----- ----- ----- ----- ----- ----- ----- ----- 0.645 0.645

11.83 3.388 459.26 ----- ----- ----- ----- ----- ----- ----- ----- 0.715 0.715

11.87 4.205 459.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.804 0.804

11.90 5.268 459.33 ----- ----- ----- ----- ----- ----- ----- ----- 0.918 0.918

11.93 6.568 459.39 ----- ----- ----- ----- ----- ----- ----- ----- 1.063 1.062

11.97 8.018 459.45 ----- ----- ----- ----- ----- ----- ----- ----- 1.243 1.243

12.00 9.514 459.53 ----- ----- ----- ----- ----- ----- ----- ----- 1.460 1.460

12.03 11.00 459.62 ----- ----- ----- ----- ----- ----- ----- ----- 1.714 1.714

12.07 12.44 459.73 ----- ----- ----- ----- ----- ----- ----- ----- 2.003 2.003

12.10 13.83 459.84 ----- ----- ----- ----- ----- ----- ----- ----- 2.325 2.325

12.13 15.14 459.97 ----- ----- ----- ----- ----- ----- ----- ----- 2.677 2.677

12.17 16.34 460.08 ----- ----- ----- ----- ----- ----- ----- ----- 2.823 2.823

12.20 17.41 460.19 ----- ----- ----- ----- ----- ----- ----- ----- 2.916 2.916

12.23 18.27 460.31 ----- ----- ----- ----- ----- ----- ----- ----- 3.015 3.015

12.27 18.85 460.43 ----- ----- ----- ----- ----- ----- ----- ----- 3.118 3.118

12.30 19.05 << 460.55 ----- ----- ----- ----- ----- ----- ----- ----- 3.223 3.223

12.33 18.79 460.68 ----- ----- ----- ----- ----- ----- ----- ----- 3.326 3.326

12.37 18.07 460.79 ----- ----- ----- ----- ----- ----- ----- ----- 3.426 3.426

12.40 17.05 460.90 ----- ----- ----- ----- ----- ----- ----- ----- 3.520 3.520

12.43 15.91 461.00 ----- ----- ----- ----- ----- ----- ----- ----- 3.605 3.605

12.47 14.73 461.08 ----- ----- ----- ----- ----- ----- ----- ----- 3.668 3.668

12.50 13.53 461.14 ----- ----- ----- ----- ----- ----- ----- ----- 3.724 3.724

12.53 12.31 461.20 ----- ----- ----- ----- ----- ----- ----- ----- 3.773 3.773

12.57 11.10 461.25 ----- ----- ----- ----- ----- ----- ----- ----- 3.816 3.816 Continues on next page...
4 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

12.60 9.899 461.29 ----- ----- ----- ----- ----- ----- ----- ----- 3.852 3.852

12.63 8.725 461.32 ----- ----- ----- ----- ----- ----- ----- ----- 3.881 3.881

12.67 7.596 461.35 ----- ----- ----- ----- ----- ----- ----- ----- 3.904 3.904

12.70 6.544 461.37 ----- ----- ----- ----- ----- ----- ----- ----- 3.921 3.921

12.73 5.611 461.38 ----- ----- ----- ----- ----- ----- ----- ----- 3.932 3.932

12.77 4.839 461.39 ----- ----- ----- ----- ----- ----- ----- ----- 3.939 3.939

12.80 4.280 461.39 ----- ----- ----- ----- ----- ----- ----- ----- 3.943 3.943

12.83 3.926 461.39 << ----- ----- ----- ----- ----- ----- ----- ----- 3.944 3.944 <<

12.87 3.706 461.39 ----- ----- ----- ----- ----- ----- ----- ----- 3.943 3.943

12.90 3.539 461.39 ----- ----- ----- ----- ----- ----- ----- ----- 3.941 3.941

12.93 3.385 461.39 ----- ----- ----- ----- ----- ----- ----- ----- 3.939 3.939

12.97 3.244 461.38 ----- ----- ----- ----- ----- ----- ----- ----- 3.935 3.935

13.00 3.116 461.38 ----- ----- ----- ----- ----- ----- ----- ----- 3.931 3.931

13.03 2.999 461.37 ----- ----- ----- ----- ----- ----- ----- ----- 3.926 3.926

13.07 2.893 461.37 ----- ----- ----- ----- ----- ----- ----- ----- 3.921 3.921

13.10 2.796 461.36 ----- ----- ----- ----- ----- ----- ----- ----- 3.915 3.915

13.13 2.708 461.35 ----- ----- ----- ----- ----- ----- ----- ----- 3.909 3.909

13.17 2.629 461.34 ----- ----- ----- ----- ----- ----- ----- ----- 3.903 3.903

13.20 2.557 461.34 ----- ----- ----- ----- ----- ----- ----- ----- 3.896 3.896

13.23 2.491 461.33 ----- ----- ----- ----- ----- ----- ----- ----- 3.888 3.888

13.27 2.431 461.32 ----- ----- ----- ----- ----- ----- ----- ----- 3.881 3.881

13.30 2.376 461.31 ----- ----- ----- ----- ----- ----- ----- ----- 3.873 3.873

13.33 2.325 461.30 ----- ----- ----- ----- ----- ----- ----- ----- 3.864 3.864

13.37 2.276 461.29 ----- ----- ----- ----- ----- ----- ----- ----- 3.856 3.856

13.40 2.230 461.28 ----- ----- ----- ----- ----- ----- ----- ----- 3.847 3.847

13.43 2.186 461.27 ----- ----- ----- ----- ----- ----- ----- ----- 3.839 3.839

13.47 2.143 461.26 ----- ----- ----- ----- ----- ----- ----- ----- 3.830 3.830 Continues on next page...
5 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

13.50 2.103 461.25 ----- ----- ----- ----- ----- ----- ----- ----- 3.820 3.820

13.53 2.063 461.24 ----- ----- ----- ----- ----- ----- ----- ----- 3.811 3.811

13.57 2.026 461.23 ----- ----- ----- ----- ----- ----- ----- ----- 3.802 3.802

13.60 1.989 461.22 ----- ----- ----- ----- ----- ----- ----- ----- 3.792 3.792

13.63 1.954 461.21 ----- ----- ----- ----- ----- ----- ----- ----- 3.782 3.782

13.67 1.920 461.20 ----- ----- ----- ----- ----- ----- ----- ----- 3.772 3.772

13.70 1.888 461.18 ----- ----- ----- ----- ----- ----- ----- ----- 3.762 3.762

13.73 1.856 461.17 ----- ----- ----- ----- ----- ----- ----- ----- 3.752 3.752

13.77 1.825 461.16 ----- ----- ----- ----- ----- ----- ----- ----- 3.742 3.742

13.80 1.796 461.15 ----- ----- ----- ----- ----- ----- ----- ----- 3.732 3.732

13.83 1.767 461.14 ----- ----- ----- ----- ----- ----- ----- ----- 3.721 3.721

13.87 1.738 461.12 ----- ----- ----- ----- ----- ----- ----- ----- 3.711 3.711

13.90 1.711 461.11 ----- ----- ----- ----- ----- ----- ----- ----- 3.700 3.700

13.93 1.684 461.10 ----- ----- ----- ----- ----- ----- ----- ----- 3.689 3.689

13.97 1.657 461.09 ----- ----- ----- ----- ----- ----- ----- ----- 3.678 3.678

14.00 1.631 461.08 ----- ----- ----- ----- ----- ----- ----- ----- 3.667 3.667

14.03 1.606 461.06 ----- ----- ----- ----- ----- ----- ----- ----- 3.656 3.656

14.07 1.581 461.05 ----- ----- ----- ----- ----- ----- ----- ----- 3.645 3.645

14.10 1.557 461.04 ----- ----- ----- ----- ----- ----- ----- ----- 3.634 3.634

14.13 1.533 461.02 ----- ----- ----- ----- ----- ----- ----- ----- 3.623 3.623

14.17 1.511 461.01 ----- ----- ----- ----- ----- ----- ----- ----- 3.612 3.612

14.20 1.489 461.00 ----- ----- ----- ----- ----- ----- ----- ----- 3.600 3.600

14.23 1.467 460.98 ----- ----- ----- ----- ----- ----- ----- ----- 3.586 3.586

14.27 1.447 460.97 ----- ----- ----- ----- ----- ----- ----- ----- 3.572 3.572

14.30 1.427 460.95 ----- ----- ----- ----- ----- ----- ----- ----- 3.558 3.558

14.33 1.409 460.93 ----- ----- ----- ----- ----- ----- ----- ----- 3.544 3.544

14.37 1.391 460.91 ----- ----- ----- ----- ----- ----- ----- ----- 3.530 3.530

14.40 1.375 460.90 ----- ----- ----- ----- ----- ----- ----- ----- 3.515 3.515 Continues on next page...
6 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

14.43 1.359 460.88 ----- ----- ----- ----- ----- ----- ----- ----- 3.501 3.501

14.47 1.345 460.86 ----- ----- ----- ----- ----- ----- ----- ----- 3.487 3.487

14.50 1.331 460.85 ----- ----- ----- ----- ----- ----- ----- ----- 3.473 3.473

14.53 1.319 460.83 ----- ----- ----- ----- ----- ----- ----- ----- 3.458 3.458

14.57 1.307 460.81 ----- ----- ----- ----- ----- ----- ----- ----- 3.444 3.444

14.60 1.296 460.80 ----- ----- ----- ----- ----- ----- ----- ----- 3.430 3.430

14.63 1.286 460.78 ----- ----- ----- ----- ----- ----- ----- ----- 3.416 3.416

14.67 1.276 460.76 ----- ----- ----- ----- ----- ----- ----- ----- 3.402 3.402

14.70 1.267 460.75 ----- ----- ----- ----- ----- ----- ----- ----- 3.388 3.388

14.73 1.258 460.73 ----- ----- ----- ----- ----- ----- ----- ----- 3.374 3.374

14.77 1.250 460.71 ----- ----- ----- ----- ----- ----- ----- ----- 3.360 3.360

14.80 1.242 460.70 ----- ----- ----- ----- ----- ----- ----- ----- 3.346 3.346

14.83 1.234 460.68 ----- ----- ----- ----- ----- ----- ----- ----- 3.332 3.332

14.87 1.226 460.66 ----- ----- ----- ----- ----- ----- ----- ----- 3.318 3.318

14.90 1.218 460.65 ----- ----- ----- ----- ----- ----- ----- ----- 3.304 3.304

14.93 1.210 460.63 ----- ----- ----- ----- ----- ----- ----- ----- 3.290 3.290

14.97 1.203 460.62 ----- ----- ----- ----- ----- ----- ----- ----- 3.276 3.276

15.00 1.195 460.60 ----- ----- ----- ----- ----- ----- ----- ----- 3.263 3.263

15.03 1.187 460.58 ----- ----- ----- ----- ----- ----- ----- ----- 3.249 3.249

15.07 1.179 460.57 ----- ----- ----- ----- ----- ----- ----- ----- 3.235 3.235

15.10 1.171 460.55 ----- ----- ----- ----- ----- ----- ----- ----- 3.222 3.222

15.13 1.163 460.54 ----- ----- ----- ----- ----- ----- ----- ----- 3.208 3.208

15.17 1.156 460.52 ----- ----- ----- ----- ----- ----- ----- ----- 3.194 3.194

15.20 1.148 460.50 ----- ----- ----- ----- ----- ----- ----- ----- 3.181 3.181

15.23 1.140 460.49 ----- ----- ----- ----- ----- ----- ----- ----- 3.168 3.168

15.27 1.132 460.47 ----- ----- ----- ----- ----- ----- ----- ----- 3.154 3.154

15.30 1.124 460.46 ----- ----- ----- ----- ----- ----- ----- ----- 3.141 3.141

15.33 1.116 460.44 ----- ----- ----- ----- ----- ----- ----- ----- 3.127 3.127 Continues on next page...
7 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

15.37 1.108 460.42 ----- ----- ----- ----- ----- ----- ----- ----- 3.114 3.114

15.40 1.100 460.41 ----- ----- ----- ----- ----- ----- ----- ----- 3.101 3.101

15.43 1.092 460.39 ----- ----- ----- ----- ----- ----- ----- ----- 3.087 3.087

15.47 1.084 460.38 ----- ----- ----- ----- ----- ----- ----- ----- 3.074 3.074

15.50 1.076 460.36 ----- ----- ----- ----- ----- ----- ----- ----- 3.061 3.061

15.53 1.068 460.35 ----- ----- ----- ----- ----- ----- ----- ----- 3.048 3.048

15.57 1.060 460.33 ----- ----- ----- ----- ----- ----- ----- ----- 3.035 3.035

15.60 1.052 460.32 ----- ----- ----- ----- ----- ----- ----- ----- 3.022 3.022

15.63 1.044 460.30 ----- ----- ----- ----- ----- ----- ----- ----- 3.009 3.009

15.67 1.036 460.28 ----- ----- ----- ----- ----- ----- ----- ----- 2.996 2.996

15.70 1.027 460.27 ----- ----- ----- ----- ----- ----- ----- ----- 2.983 2.983

15.73 1.019 460.25 ----- ----- ----- ----- ----- ----- ----- ----- 2.970 2.970

15.77 1.011 460.24 ----- ----- ----- ----- ----- ----- ----- ----- 2.957 2.957

15.80 1.003 460.22 ----- ----- ----- ----- ----- ----- ----- ----- 2.944 2.944

15.83 0.995 460.21 ----- ----- ----- ----- ----- ----- ----- ----- 2.931 2.931

15.87 0.987 460.19 ----- ----- ----- ----- ----- ----- ----- ----- 2.918 2.918

15.90 0.979 460.18 ----- ----- ----- ----- ----- ----- ----- ----- 2.905 2.905

15.93 0.970 460.16 ----- ----- ----- ----- ----- ----- ----- ----- 2.892 2.892

15.97 0.962 460.15 ----- ----- ----- ----- ----- ----- ----- ----- 2.880 2.880

16.00 0.954 460.13 ----- ----- ----- ----- ----- ----- ----- ----- 2.867 2.867

16.03 0.946 460.12 ----- ----- ----- ----- ----- ----- ----- ----- 2.854 2.854

16.07 0.938 460.10 ----- ----- ----- ----- ----- ----- ----- ----- 2.842 2.842

16.10 0.930 460.09 ----- ----- ----- ----- ----- ----- ----- ----- 2.829 2.829

16.13 0.922 460.07 ----- ----- ----- ----- ----- ----- ----- ----- 2.816 2.816

16.17 0.914 460.06 ----- ----- ----- ----- ----- ----- ----- ----- 2.804 2.804

16.20 0.906 460.04 ----- ----- ----- ----- ----- ----- ----- ----- 2.791 2.791

16.23 0.899 460.03 ----- ----- ----- ----- ----- ----- ----- ----- 2.779 2.779

16.27 0.891 460.01 ----- ----- ----- ----- ----- ----- ----- ----- 2.766 2.766 Continues on next page...
8 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

16.30 0.884 460.00 ----- ----- ----- ----- ----- ----- ----- ----- 2.751 2.751

16.33 0.878 459.98 ----- ----- ----- ----- ----- ----- ----- ----- 2.697 2.697

16.37 0.871 459.96 ----- ----- ----- ----- ----- ----- ----- ----- 2.645 2.645

16.40 0.865 459.94 ----- ----- ----- ----- ----- ----- ----- ----- 2.593 2.593

16.43 0.860 459.92 ----- ----- ----- ----- ----- ----- ----- ----- 2.543 2.543

16.47 0.854 459.91 ----- ----- ----- ----- ----- ----- ----- ----- 2.494 2.494

16.50 0.849 459.89 ----- ----- ----- ----- ----- ----- ----- ----- 2.447 2.447

16.53 0.845 459.87 ----- ----- ----- ----- ----- ----- ----- ----- 2.401 2.401

16.57 0.841 459.86 ----- ----- ----- ----- ----- ----- ----- ----- 2.356 2.356

16.60 0.837 459.84 ----- ----- ----- ----- ----- ----- ----- ----- 2.312 2.312

16.63 0.833 459.82 ----- ----- ----- ----- ----- ----- ----- ----- 2.269 2.269

16.67 0.829 459.81 ----- ----- ----- ----- ----- ----- ----- ----- 2.228 2.228

16.70 0.826 459.79 ----- ----- ----- ----- ----- ----- ----- ----- 2.187 2.187

16.73 0.823 459.78 ----- ----- ----- ----- ----- ----- ----- ----- 2.148 2.148

16.77 0.820 459.77 ----- ----- ----- ----- ----- ----- ----- ----- 2.109 2.109

16.80 0.817 459.75 ----- ----- ----- ----- ----- ----- ----- ----- 2.072 2.072

16.83 0.814 459.74 ----- ----- ----- ----- ----- ----- ----- ----- 2.036 2.036

16.87 0.811 459.73 ----- ----- ----- ----- ----- ----- ----- ----- 2.000 2.000

16.90 0.808 459.71 ----- ----- ----- ----- ----- ----- ----- ----- 1.966 1.966

16.93 0.805 459.70 ----- ----- ----- ----- ----- ----- ----- ----- 1.932 1.932

16.97 0.802 459.69 ----- ----- ----- ----- ----- ----- ----- ----- 1.900 1.900

17.00 0.800 459.68 ----- ----- ----- ----- ----- ----- ----- ----- 1.868 1.868

17.03 0.797 459.67 ----- ----- ----- ----- ----- ----- ----- ----- 1.837 1.837

17.07 0.794 459.66 ----- ----- ----- ----- ----- ----- ----- ----- 1.807 1.807

17.10 0.791 459.65 ----- ----- ----- ----- ----- ----- ----- ----- 1.778 1.778

17.13 0.788 459.63 ----- ----- ----- ----- ----- ----- ----- ----- 1.749 1.749

17.17 0.785 459.62 ----- ----- ----- ----- ----- ----- ----- ----- 1.721 1.721

17.20 0.782 459.61 ----- ----- ----- ----- ----- ----- ----- ----- 1.694 1.694 Continues on next page...
9 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

17.23 0.780 459.61 ----- ----- ----- ----- ----- ----- ----- ----- 1.668 1.668

17.27 0.777 459.60 ----- ----- ----- ----- ----- ----- ----- ----- 1.642 1.642

17.30 0.774 459.59 ----- ----- ----- ----- ----- ----- ----- ----- 1.617 1.617

17.33 0.771 459.58 ----- ----- ----- ----- ----- ----- ----- ----- 1.593 1.593

17.37 0.768 459.57 ----- ----- ----- ----- ----- ----- ----- ----- 1.569 1.569

17.40 0.765 459.56 ----- ----- ----- ----- ----- ----- ----- ----- 1.546 1.546

17.43 0.762 459.55 ----- ----- ----- ----- ----- ----- ----- ----- 1.523 1.523

17.47 0.759 459.54 ----- ----- ----- ----- ----- ----- ----- ----- 1.501 1.501

17.50 0.756 459.54 ----- ----- ----- ----- ----- ----- ----- ----- 1.479 1.479

17.53 0.754 459.53 ----- ----- ----- ----- ----- ----- ----- ----- 1.459 1.459

17.57 0.751 459.52 ----- ----- ----- ----- ----- ----- ----- ----- 1.438 1.438

17.60 0.748 459.51 ----- ----- ----- ----- ----- ----- ----- ----- 1.418 1.418

17.63 0.745 459.51 ----- ----- ----- ----- ----- ----- ----- ----- 1.399 1.399

17.67 0.742 459.50 ----- ----- ----- ----- ----- ----- ----- ----- 1.380 1.380

17.70 0.739 459.49 ----- ----- ----- ----- ----- ----- ----- ----- 1.361 1.361

17.73 0.736 459.49 ----- ----- ----- ----- ----- ----- ----- ----- 1.343 1.343

17.77 0.733 459.48 ----- ----- ----- ----- ----- ----- ----- ----- 1.326 1.326

17.80 0.730 459.48 ----- ----- ----- ----- ----- ----- ----- ----- 1.309 1.309

17.83 0.727 459.47 ----- ----- ----- ----- ----- ----- ----- ----- 1.292 1.292

17.87 0.724 459.46 ----- ----- ----- ----- ----- ----- ----- ----- 1.275 1.275

17.90 0.722 459.46 ----- ----- ----- ----- ----- ----- ----- ----- 1.259 1.259

17.93 0.719 459.45 ----- ----- ----- ----- ----- ----- ----- ----- 1.244 1.244

17.97 0.716 459.45 ----- ----- ----- ----- ----- ----- ----- ----- 1.229 1.229

18.00 0.713 459.44 ----- ----- ----- ----- ----- ----- ----- ----- 1.214 1.214

18.03 0.710 459.44 ----- ----- ----- ----- ----- ----- ----- ----- 1.199 1.199

18.07 0.707 459.43 ----- ----- ----- ----- ----- ----- ----- ----- 1.185 1.185

18.10 0.704 459.43 ----- ----- ----- ----- ----- ----- ----- ----- 1.171 1.171

18.13 0.701 459.42 ----- ----- ----- ----- ----- ----- ----- ----- 1.158 1.158 Continues on next page...
10 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

18.17 0.698 459.42 ----- ----- ----- ----- ----- ----- ----- ----- 1.144 1.144

18.20 0.695 459.41 ----- ----- ----- ----- ----- ----- ----- ----- 1.132 1.131

18.23 0.692 459.41 ----- ----- ----- ----- ----- ----- ----- ----- 1.119 1.119

18.27 0.689 459.40 ----- ----- ----- ----- ----- ----- ----- ----- 1.106 1.106

18.30 0.686 459.40 ----- ----- ----- ----- ----- ----- ----- ----- 1.094 1.094

18.33 0.683 459.39 ----- ----- ----- ----- ----- ----- ----- ----- 1.083 1.083

18.37 0.680 459.39 ----- ----- ----- ----- ----- ----- ----- ----- 1.071 1.071

18.40 0.677 459.38 ----- ----- ----- ----- ----- ----- ----- ----- 1.060 1.060

18.43 0.674 459.38 ----- ----- ----- ----- ----- ----- ----- ----- 1.048 1.048

18.47 0.671 459.38 ----- ----- ----- ----- ----- ----- ----- ----- 1.038 1.038

18.50 0.668 459.37 ----- ----- ----- ----- ----- ----- ----- ----- 1.027 1.027

18.53 0.665 459.37 ----- ----- ----- ----- ----- ----- ----- ----- 1.017 1.017

18.57 0.662 459.37 ----- ----- ----- ----- ----- ----- ----- ----- 1.006 1.006

18.60 0.659 459.36 ----- ----- ----- ----- ----- ----- ----- ----- 0.996 0.996

18.63 0.656 459.36 ----- ----- ----- ----- ----- ----- ----- ----- 0.987 0.987

18.67 0.654 459.35 ----- ----- ----- ----- ----- ----- ----- ----- 0.977 0.977

18.70 0.651 459.35 ----- ----- ----- ----- ----- ----- ----- ----- 0.968 0.968

18.73 0.648 459.35 ----- ----- ----- ----- ----- ----- ----- ----- 0.958 0.958

18.77 0.645 459.34 ----- ----- ----- ----- ----- ----- ----- ----- 0.949 0.949

18.80 0.642 459.34 ----- ----- ----- ----- ----- ----- ----- ----- 0.941 0.941

18.83 0.639 459.34 ----- ----- ----- ----- ----- ----- ----- ----- 0.932 0.932

18.87 0.636 459.34 ----- ----- ----- ----- ----- ----- ----- ----- 0.923 0.923

18.90 0.633 459.33 ----- ----- ----- ----- ----- ----- ----- ----- 0.915 0.915

18.93 0.630 459.33 ----- ----- ----- ----- ----- ----- ----- ----- 0.907 0.907

18.97 0.627 459.33 ----- ----- ----- ----- ----- ----- ----- ----- 0.899 0.899

19.00 0.624 459.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.891 0.891

19.03 0.621 459.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.883 0.883

19.07 0.618 459.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.875 0.875 Continues on next page...
11 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

19.10 0.615 459.32 ----- ----- ----- ----- ----- ----- ----- ----- 0.868 0.868

19.13 0.612 459.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.861 0.861

19.17 0.608 459.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.853 0.853

19.20 0.605 459.31 ----- ----- ----- ----- ----- ----- ----- ----- 0.846 0.846

19.23 0.602 459.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.839 0.839

19.27 0.599 459.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.832 0.832

19.30 0.596 459.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.826 0.826

19.33 0.593 459.30 ----- ----- ----- ----- ----- ----- ----- ----- 0.819 0.819

19.37 0.590 459.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.812 0.812

19.40 0.587 459.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.806 0.806

19.43 0.584 459.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.799 0.799

19.47 0.581 459.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.793 0.793

19.50 0.578 459.29 ----- ----- ----- ----- ----- ----- ----- ----- 0.787 0.787

19.53 0.575 459.28 ----- ----- ----- ----- ----- ----- ----- ----- 0.781 0.781

19.57 0.572 459.28 ----- ----- ----- ----- ----- ----- ----- ----- 0.775 0.775

19.60 0.569 459.28 ----- ----- ----- ----- ----- ----- ----- ----- 0.769 0.769

19.63 0.566 459.28 ----- ----- ----- ----- ----- ----- ----- ----- 0.763 0.763

19.67 0.563 459.27 ----- ----- ----- ----- ----- ----- ----- ----- 0.757 0.757

19.70 0.560 459.27 ----- ----- ----- ----- ----- ----- ----- ----- 0.752 0.752

19.73 0.557 459.27 ----- ----- ----- ----- ----- ----- ----- ----- 0.746 0.746

19.77 0.554 459.27 ----- ----- ----- ----- ----- ----- ----- ----- 0.741 0.741

19.80 0.551 459.27 ----- ----- ----- ----- ----- ----- ----- ----- 0.735 0.735

19.83 0.548 459.26 ----- ----- ----- ----- ----- ----- ----- ----- 0.730 0.730

19.87 0.545 459.26 ----- ----- ----- ----- ----- ----- ----- ----- 0.725 0.725

19.90 0.542 459.26 ----- ----- ----- ----- ----- ----- ----- ----- 0.719 0.719

19.93 0.539 459.26 ----- ----- ----- ----- ----- ----- ----- ----- 0.714 0.714

19.97 0.536 459.26 ----- ----- ----- ----- ----- ----- ----- ----- 0.709 0.709

20.00 0.532 459.26 ----- ----- ----- ----- ----- ----- ----- ----- 0.704 0.704 Continues on next page...
12 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

20.03 0.529 459.25 ----- ----- ----- ----- ----- ----- ----- ----- 0.699 0.699

20.07 0.526 459.25 ----- ----- ----- ----- ----- ----- ----- ----- 0.694 0.694

20.10 0.523 459.25 ----- ----- ----- ----- ----- ----- ----- ----- 0.689 0.689

20.13 0.520 459.25 ----- ----- ----- ----- ----- ----- ----- ----- 0.684 0.684

20.17 0.518 459.25 ----- ----- ----- ----- ----- ----- ----- ----- 0.680 0.680

20.20 0.515 459.24 ----- ----- ----- ----- ----- ----- ----- ----- 0.675 0.675

20.23 0.512 459.24 ----- ----- ----- ----- ----- ----- ----- ----- 0.670 0.670

20.27 0.509 459.24 ----- ----- ----- ----- ----- ----- ----- ----- 0.665 0.666

20.30 0.507 459.24 ----- ----- ----- ----- ----- ----- ----- ----- 0.661 0.661

20.33 0.505 459.24 ----- ----- ----- ----- ----- ----- ----- ----- 0.656 0.656

20.37 0.502 459.24 ----- ----- ----- ----- ----- ----- ----- ----- 0.652 0.652

20.40 0.500 459.24 ----- ----- ----- ----- ----- ----- ----- ----- 0.648 0.648

20.43 0.498 459.23 ----- ----- ----- ----- ----- ----- ----- ----- 0.643 0.643

20.47 0.497 459.23 ----- ----- ----- ----- ----- ----- ----- ----- 0.639 0.639

20.50 0.495 459.23 ----- ----- ----- ----- ----- ----- ----- ----- 0.635 0.635

20.53 0.494 459.23 ----- ----- ----- ----- ----- ----- ----- ----- 0.631 0.631

20.57 0.493 459.23 ----- ----- ----- ----- ----- ----- ----- ----- 0.627 0.627

20.60 0.492 459.23 ----- ----- ----- ----- ----- ----- ----- ----- 0.623 0.623

20.63 0.491 459.22 ----- ----- ----- ----- ----- ----- ----- ----- 0.619 0.619

20.67 0.490 459.22 ----- ----- ----- ----- ----- ----- ----- ----- 0.616 0.616

20.70 0.489 459.22 ----- ----- ----- ----- ----- ----- ----- ----- 0.612 0.612

20.73 0.488 459.22 ----- ----- ----- ----- ----- ----- ----- ----- 0.608 0.608

20.77 0.487 459.22 ----- ----- ----- ----- ----- ----- ----- ----- 0.605 0.605

20.80 0.487 459.22 ----- ----- ----- ----- ----- ----- ----- ----- 0.601 0.601

20.83 0.486 459.22 ----- ----- ----- ----- ----- ----- ----- ----- 0.598 0.598

20.87 0.486 459.22 ----- ----- ----- ----- ----- ----- ----- ----- 0.595 0.595

20.90 0.485 459.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.592 0.592

20.93 0.485 459.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.589 0.589 Continues on next page...
13 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

20.97 0.484 459.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.586 0.586

21.00 0.483 459.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.583 0.583

21.03 0.483 459.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.580 0.580

21.07 0.482 459.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.577 0.577

21.10 0.482 459.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.574 0.574

21.13 0.481 459.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.572 0.572

21.17 0.481 459.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.569 0.569

21.20 0.480 459.21 ----- ----- ----- ----- ----- ----- ----- ----- 0.566 0.566

21.23 0.480 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.564 0.564

21.27 0.479 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.561 0.561

21.30 0.478 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.559 0.559

21.33 0.478 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.557 0.557

21.37 0.477 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.554 0.554

21.40 0.477 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.552 0.552

21.43 0.476 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.550 0.550

21.47 0.476 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.548 0.548

21.50 0.475 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.546 0.546

21.53 0.474 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.544 0.544

21.57 0.474 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.542 0.542

21.60 0.473 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.540 0.540

21.63 0.473 459.20 ----- ----- ----- ----- ----- ----- ----- ----- 0.538 0.538

21.67 0.472 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.536 0.536

21.70 0.472 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.534 0.534

21.73 0.471 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.532 0.532

21.77 0.470 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.530 0.530

21.80 0.470 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.529 0.529

21.83 0.469 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.527 0.527

21.87 0.469 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.525 0.525 Continues on next page...
14 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

21.90 0.468 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.524 0.524

21.93 0.468 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.522 0.522

21.97 0.467 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.520 0.520

22.00 0.466 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.519 0.519

22.03 0.466 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.517 0.517

22.07 0.465 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.516 0.516

22.10 0.465 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.514 0.514

22.13 0.464 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.513 0.513

22.17 0.464 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.512 0.512

22.20 0.463 459.19 ----- ----- ----- ----- ----- ----- ----- ----- 0.510 0.510

22.23 0.462 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.509 0.509

22.27 0.462 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.507 0.507

22.30 0.461 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.506 0.506

22.33 0.461 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.505 0.505

22.37 0.460 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.504 0.504

22.40 0.460 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.502 0.502

22.43 0.459 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.501 0.501

22.47 0.458 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.500 0.500

22.50 0.458 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.499 0.499

22.53 0.457 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.497 0.497

22.57 0.457 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.496 0.496

22.60 0.456 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.495 0.495

22.63 0.456 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.494 0.494

22.67 0.455 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.493 0.493

22.70 0.454 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.492 0.492

22.73 0.454 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.491 0.491

22.77 0.453 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.490 0.490

22.80 0.453 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.489 0.489 Continues on next page...
15 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

22.83 0.452 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.487 0.487

22.87 0.451 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.486 0.486

22.90 0.451 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.485 0.485

22.93 0.450 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.484 0.484

22.97 0.450 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.483 0.483

23.00 0.449 459.18 ----- ----- ----- ----- ----- ----- ----- ----- 0.482 0.482

23.03 0.449 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.481 0.481

23.07 0.448 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.481 0.481

23.10 0.447 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.480 0.480

23.13 0.447 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.479 0.479

23.17 0.446 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.478 0.478

23.20 0.446 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.477 0.477

23.23 0.445 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.476 0.476

23.27 0.445 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.475 0.475

23.30 0.444 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.474 0.474

23.33 0.443 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.473 0.473

23.37 0.443 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.472 0.472

23.40 0.442 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.471 0.471

23.43 0.442 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.471 0.471

23.47 0.441 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.470 0.470

23.50 0.440 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.469 0.469

23.53 0.440 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.468 0.468

23.57 0.439 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.467 0.467

23.60 0.439 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.466 0.466

23.63 0.438 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.466 0.466

23.67 0.437 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.465 0.465

23.70 0.437 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.464 0.464

23.73 0.436 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.463 0.463 Continues on next page...
16 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

23.77 0.436 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.462 0.462

23.80 0.435 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.462 0.462

23.83 0.435 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.461 0.461

23.87 0.434 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.460 0.460

23.90 0.433 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.459 0.459

23.93 0.433 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.459 0.459

23.97 0.432 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.458 0.458

24.00 0.432 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.457 0.457

24.03 0.429 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.456 0.456

24.07 0.423 459.17 ----- ----- ----- ----- ----- ----- ----- ----- 0.455 0.455

24.10 0.415 459.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.454 0.454

24.13 0.405 459.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.453 0.453

24.17 0.393 459.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.452 0.452

24.20 0.377 459.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.450 0.450

24.23 0.360 459.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.447 0.447

24.27 0.340 459.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.444 0.444

24.30 0.318 459.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.441 0.441

24.33 0.293 459.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.437 0.437

24.37 0.266 459.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.433 0.433

24.40 0.237 459.16 ----- ----- ----- ----- ----- ----- ----- ----- 0.427 0.427

24.43 0.205 459.15 ----- ----- ----- ----- ----- ----- ----- ----- 0.422 0.421

24.47 0.176 459.15 ----- ----- ----- ----- ----- ----- ----- ----- 0.415 0.415

24.50 0.149 459.15 ----- ----- ----- ----- ----- ----- ----- ----- 0.408 0.408

24.53 0.124 459.15 ----- ----- ----- ----- ----- ----- ----- ----- 0.400 0.400

24.57 0.101 459.14 ----- ----- ----- ----- ----- ----- ----- ----- 0.391 0.391

24.60 0.081 459.14 ----- ----- ----- ----- ----- ----- ----- ----- 0.383 0.383

24.63 0.063 459.14 ----- ----- ----- ----- ----- ----- ----- ----- 0.374 0.374

24.67 0.047 459.13 ----- ----- ----- ----- ----- ----- ----- ----- 0.365 0.365 Continues on next page...
17 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

24.70 0.034 459.13 ----- ----- ----- ----- ----- ----- ----- ----- 0.355 0.355

24.73 0.022 459.13 ----- ----- ----- ----- ----- ----- ----- ----- 0.346 0.346

24.77 0.013 459.12 ----- ----- ----- ----- ----- ----- ----- ----- 0.336 0.336

24.80 0.007 459.12 ----- ----- ----- ----- ----- ----- ----- ----- 0.327 0.327

24.83 0.002 459.12 ----- ----- ----- ----- ----- ----- ----- ----- 0.318 0.317

24.87 0.000 459.11 ----- ----- ----- ----- ----- ----- ----- ----- 0.308 0.308

24.90 0.000 459.11 ----- ----- ----- ----- ----- ----- ----- ----- 0.299 0.299

24.93 0.000 459.11 ----- ----- ----- ----- ----- ----- ----- ----- 0.291 0.291

24.97 0.000 459.10 ----- ----- ----- ----- ----- ----- ----- ----- 0.282 0.282

25.00 0.000 459.10 ----- ----- ----- ----- ----- ----- ----- ----- 0.274 0.274

25.03 0.000 459.10 ----- ----- ----- ----- ----- ----- ----- ----- 0.266 0.266

25.07 0.000 459.09 ----- ----- ----- ----- ----- ----- ----- ----- 0.259 0.259

25.10 0.000 459.09 ----- ----- ----- ----- ----- ----- ----- ----- 0.251 0.251

25.13 0.000 459.09 ----- ----- ----- ----- ----- ----- ----- ----- 0.244 0.244

25.17 0.000 459.09 ----- ----- ----- ----- ----- ----- ----- ----- 0.237 0.237

25.20 0.000 459.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.230 0.230

25.23 0.000 459.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.223 0.223

25.27 0.000 459.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.217 0.217

25.30 0.000 459.08 ----- ----- ----- ----- ----- ----- ----- ----- 0.211 0.211

25.33 0.000 459.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.205 0.205

25.37 0.000 459.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.199 0.199

25.40 0.000 459.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.193 0.193

25.43 0.000 459.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.187 0.187

25.47 0.000 459.07 ----- ----- ----- ----- ----- ----- ----- ----- 0.182 0.182

25.50 0.000 459.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.177 0.177

25.53 0.000 459.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.171 0.172

25.57 0.000 459.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.167 0.167

25.60 0.000 459.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.162 0.162 Continues on next page...
18 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

25.63 0.000 459.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.157 0.157

25.67 0.000 459.06 ----- ----- ----- ----- ----- ----- ----- ----- 0.152 0.153

25.70 0.000 459.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.148 0.148

25.73 0.000 459.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.144 0.144

25.77 0.000 459.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.140 0.140

25.80 0.000 459.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.136 0.136

25.83 0.000 459.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.132 0.132

25.87 0.000 459.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.128 0.128

25.90 0.000 459.05 ----- ----- ----- ----- ----- ----- ----- ----- 0.124 0.124

25.93 0.000 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.121 0.121

25.97 0.000 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.117 0.117

26.00 0.000 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.114 0.114

26.03 0.000 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.110 0.110

26.07 0.000 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.107 0.107

26.10 0.000 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.104 0.104

26.13 0.000 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.101 0.101

26.17 0.000 459.04 ----- ----- ----- ----- ----- ----- ----- ----- 0.098 0.098

26.20 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.095 0.095

26.23 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.093 0.093

26.27 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.090 0.090

26.30 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.087 0.087

26.33 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.085 0.085

26.37 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.082 0.082

26.40 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.080 0.080

26.43 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.078 0.078

26.47 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.075 0.075

26.50 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.073 0.073

26.53 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.071 0.071 Continues on next page...
19 RETENTION BASIN, A
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C PfRsr Wr A Wr B Wr C Wr D Exfil Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs

26.57 0.000 459.03 ----- ----- ----- ----- ----- ----- ----- ----- 0.069 0.069

26.60 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.067 0.067

26.63 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.065 0.065

26.67 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.063 0.063

26.70 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.061 0.061

26.73 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.060 0.060

26.77 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.058 0.058

26.80 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.056 0.056

26.83 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.055 0.055

26.87 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.053 0.053

26.90 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.052 0.052

26.93 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.050 0.050

26.97 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.049 0.049

27.00 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.047 0.047

27.03 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.046 0.046

27.07 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.044 0.044

27.10 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.043 0.043

27.13 0.000 459.02 ----- ----- ----- ----- ----- ----- ----- ----- 0.042 0.042

27.17 0.000 459.01 ----- ----- ----- ----- ----- ----- ----- ----- 0.041 0.041

27.20 0.000 459.01 ----- ----- ----- ----- ----- ----- ----- ----- 0.040 0.040 ...End
Pond Report 20
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Wednesday, 06 / 7 / 2023 Pond No. 2 - RETENTION BASIN, A
Pond Data
Contours -User-defined contour areas. Conic method used for volume calculation. Begining Elevation = 459.00 ft Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft)