Specific model criteria have been developed to evaluate each model’s capabilities and potential to accurately model existing and proposed watershed conditions). The selection criteria are based on the software’s ability to accurately model sub-watersheds through calibration. The criteria presented may be refined or updated throughout the course of the project to incorporate additional needs or issues that may emerge during the process of the DMP. Model criteria were divided into two categories: primary and secondary. Primary criteria are those that are considered necessary to meet the goals of the DMP.
Secondary criteria are those that are not considered necessary, but help facilitate the process and improve deliverables.
Table 1. Model selection criteria
Criteria Name Criteria
Type
Description
General Model Components
Temporal scale and
representation
Primary Design storm (flood control)
Simulation time step of hourly or finer
User requirements Primary Technically defensible (accuracy) Previous use/validation thoroughly tested, results in peerreviewed literature, previous studies User requirements Secondary Model availability in public domain Ability to import/export features to/from GIS/CAD
Availability of technical support
Hydrology/Hydraulics
Hydrologic/Hydraulic
Processes
Primary Generation of hyetographs and relation to runoff generation Ability to account for spatial variation of precipitation Runoff volumes
Flow-rates (hydrographs and peaks)
Time of concentration
Flow Routing
Channel/pipe hydraulics including variability in geometry and material of conduits
Ability to represent a detailed storm drain network and import features from GIS/CAD to streamline process
Diversion structures
Water Quality
Water Quality
Modeling
Requirements
Primary* Ability to incorporate modeling of pollutants during dry-weather and wet-weather conditions.
Pollutant load routing through the conveyance system, including load reduction and treatment.
Flexible pollutant build-up/wash-off modeling options using empirical or physical parameters.
*prefered for future efforts
While the current modeling effort is focused on flood control through H&H modeling, the ability to integrate Water Quality (WQ) and 2-D modeling at a later date is an important consideration during the Mr. Clapp
June 7 2016
model selection process. This will allow future efforts to integrate water quality criteria and/or more detailed/complex 2-D scenarios directly into existing models created during this flood control effort.
Model Descriptions
A number of models were identified that are capable of meeting the objectives of the DMP. A cursory review limited the model selection to the following model options based on various Storm Water Management Model (SWMM) platforms: USEPA SWMM, PCSWMM, XPSWMM, InfoSWMM, and MikeUrban. A brief description of each model is provided below.
United States Environmental Protection Agency Storm Water Management Model: USEPA SWMM is a dynamic rainfall-runoff simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. The runoff component of SWMM operates on a collection of subcatchment areas that receive precipitation and generate runoff and pollutant loads (USEPA, 2015). It was developed for the analysis of surface runoff and flow routing through complex urban storm water systems. Flow routing is performed for surface and sub-surface conveyances and ground water systems, including the option of non-linear reservoir channel routing and fully dynamic hydraulic flow routing. In the fully dynamic hydraulic flow routing option, SWMM simulates backwater, surcharging, pressure flow, and looped connections. SWMM has a variety of options for water quality simulation, including traditional buildup and wash-off formulation, as well as rating curves and regression techniques. SWMM incorporates first order decay and particle settling mechanisms in pollutant transport simulations and includes an option of simple scour-deposition routine. Storage, treatment, and other BMP components can also be simulated.
Model Features
• Watershed hydrology and water quality
• Stream/conduit transport
• Urban stormwater and sewage systems
• Single Storm Event Modeling
• Continuous Simulation Modeling
Model Strengths
• Fully dynamic hydraulic routing
• Hydraulic structure (manhole, weir, orifice, etc.) simulation • Overland flow routing between pervious and impervious areas within a subcatchment • Various options for quality simulation: buildup and wash-off, rating curves, and regression techniques
Model Limitations
• Only considers settling and first-order decay in in-stream pollutant routing and transformation • Weak groundwater simulation capability
Mr. Clapp
June 7 2016
PCSWMM: PCSWMM has a graphical user interface (GUI) with GIS integration for running EPA SWMM (all versions) and fully supports all modules, including the Rain, Temperature, Runoff, Transport, Extran, Storage/Treatment, Combine, and Statistics modules. It has the capability of providing hydro/pollutographs and animated hydraulic grade lines as part of the output. It is suitable for projects ranging from small BMP installations to major/minor drainage systems and provides GIS links to the USEPA’s SWMM core processes. PCSWMM also provides optional support for OpenSWMM engines which incorporate additional features developed by the OpenSWMM community, many of which eventually become officially adopted by the USEPA SWMM platform.
Model Features
• Uses EPA SWMM as computational tool
• Rainfall-runoff modeling of urban and rural watersheds • GUI interface
• Holistic model (hydrology, hydraulics, and water quality) • 1-D/2-D coupled hydraulic modeling
• Dynamically linked dual drainage analysis
• Built-in GIS interface and HEC-RAS importer
• Visualization/animation of results (i.e., flood mapping) • Wet weather and dry weather pollutant modeling
• Various input, analysis, and design tools for storm water management Model Strengths
• Unlimited model size
• Selective 2-D mesh densities
• Flexible input file editor
• User friendly
• Sensitivity, calibration, and error analysis tools
• Has been calibrated against other modeling software
• Full support of all SWMM modules and procedures
Model Limitations
• Not a public domain product.
• Lack of subsurface water quality routing
• No interaction of water quality processes
• Limited kinetics (a first order decay rate can be specified for each pollutant in the Transport Block)
InfoSWMM: InfoSWMM is a comprehensive hydrologic, hydraulic, and water quality simulation model for the effective management of urban stormwater and wastewater collection systems using the EPA SWMM engine. It seamlessly integrates advanced sewer collection systems modeling and optimization functionality with the latest generation of ArcGIS.
Mr. Clapp
June 7 2016
Model Features
• Rainfall-runoff modeling of urban and rural watersheds • Infiltration/inflow assessment
• Real-Time Control (RTC) operational studies
• Pond design
• Master planning of sewer collection systems and urban watersheds • Pollutant analysis
• Best Management Practices (BMPs) and Low Impact Development (LID) studies • TMDL compliance
• Generate contours, graphs and tables of modeling results directly in ArcGIS • Fully automate GIS data exchange with ESRI data sources • Automatically import and export any SWMM5 projects
• 1-D/2-D coupled hydraulic modeling
Model Strengths
• Capability to perform Low Impact Development (LID) modeling • Fully dynamic hydraulic routing
• Automatic Model Calibration/Verification
• Capability to perform above-ground flow/flooding modeling • Full support of all SWMM modules and procedures
Model Limitations
• Not a public domain product.
• Weak groundwater simulation capability
• Additional software license required for 2-D analysis XP-SWMM: XP-SWMM is an enhanced version of SWMM coupled with the EXPERT (XP) interface.
The graphical XP environment is user-friendly and encompasses data entry, run-time graphics, and postprocessing of results in graphical form. Drainage networks are either drawn on the screen over real-world topographical backgrounds or imported from a database. It has the ability to handle systems comprising pipes and open channels, rivers, loops, bifurcations, pumps, weirs, and ponds.
Model Features
• Holistic model (hydrology, hydraulics, and water quality) • EPA and FEMA regulatory approval
• Flexibility in hydrologic methodology
Model Strengths
• Completely interactive analysis engine, allowing the user to change parameters mid-run, pause or terminate a run, and to graph results on the fly.
• Dynamic memory allocation
• FEMA approved model for floodplain analysis
• Holistic model (hydrology, hydraulics, and water quality) Mr. Clapp
June 7 2016
• 1-D/2-D coupled hydraulic modeling
• Rainfall-runoff modeling of urban and rural watersheds • Ability to import from or export to SWMM 5 model formats Model Limitations
• Not a public domain product (expensive compared to similar models) • Lack of subsurface quality routing
• No interaction of quality processes
• Limited kinetics (a first order decay rate can be specified for each pollutant in the Transport Block.)
MIKE URBAN: MIKE URBAN is a flexible system for modeling and design of water distribution networks and collection systems for waste water and storm water. It is based on a database for storing network as well as hydraulic modeling data. It includes two public domain modeling program, SWMM5 and EPANET, that were developed by the EPA.
Model Features
• GIS-based model building and management
• Powerful hydraulic simulation engines
• Integrated water quality, fire flow, real time control and water hammer simulation (water distribution)
• Integrated water quality, sediment transport, real-time control, dynamic pipe design and longterm statistics (collection systems) • Full undo and redo capability in all editors
• Thematic mapping and integrated dynamic result visualization • Open data models - easy integration with other applications Model Strengths
• All GIS components and licenses are included in the software • Complete package for all urban water modeling activities • Single database management
Model Limitations
• Not a public domain product.
• Lack of ability for site scale representation
• Additional software license required for 2-D analysis Mr. Clapp
June 7 2016
Recommendations
Based on the survey of candidate models, it is recommended that the flood control model be built upon ArcGIS. The City of San Marcos’s existing inventory, including watershed delineations, has been done in ArcGIS. ArcGIS will be used to delineate additional sub-watersheds and to adjust the existing storm drain inventory and other hydraulically-connecting components of the overall project for modeling purposes. It is also recommended that the model include a publicly available domain code for ease of accessibility.
After reviewing each of the candidate models highlighted above, Rick Engineering Company is recommending the use of PCSWMM as the primary modeling software for hydrology and hydraulics.
PCSWMM is a holistic model that allows for 1-D, 2-D and coupled hydraulic modeling. Its ability to integrate ArcGIS files, HEC-RAS, and SWMM 5.0 files makes it possible to efficiently set up models.
Also, it uses the latest iteration of EPA SWMM as its primary computational engine. PCSWMM will make it possible to create an existing condition hydrologic and hydraulic model. Using NOAA Atlas 14 precipitation values and other resources, the model can accurately reflect the hydrologic conditions of the City of San Marcos.
The program’s computational capacity and ability to display results in various ways coupled with its popularity, its general cost and overall ease of use makes it, in Rick Engineering Company’s opinion, the best fit for the City of San Marcos’ Drainage Master Plan from a hydrology and hydraulics standpoint.
If you have any questions please contact Nobu Murakami or myself at (619) 291-0707.
Sincerely,
RICK ENGINEERING COMPANY
Brendan Hastie, P.E.
R.C.E. #65809, Exp. 09/17
Associate
BH:NM:rf/files/memo/17729.001
Appendix I
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
Potential CIP Opportunity 1: Upsizing 48” RCP System along La Moree Road, Barham Lane to East Barham Drive to Enterprise Street
Subcatchment: A2
Jurisdiction: City of San Marcos (mostly except the crossing near trolley tracks) Location: La Moree Road to Barham Lane to East Barham Drive to Enterprise Street Storm Hotspot: No
Upstream Tie-in: 48” RCP
Downstream Tie-in: 6’ W by 4’ H
Contributing area: 230 acres (mixed land use)
Constraints: ROW
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
Potential CIP Opportunity 2: Upsizing 24” RCP System along Mulberry Drive between Woodward Street and La Cienga Road
Subcatchment: A1
Jurisdiction: City of San Marcos
Location: Mulberry Drive between Woodward Street and La Cienga Road Storm Hotspot: No
Upstream Tie-in: 24” RCP
Downstream Tie-in: 36” RCP
Contributing area: 20 acres (mixed land use mostly vacant so useful for future development) upstream of CIP 16
Constraints: Small contributing area
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
Potential CIP Opportunity 3: Upsizing 24” RCP System along Deerbrook Drive between Del Roy Drive and North Twin Oaks Valley Road
Subcatchment: A1
Jurisdiction: City of San Marcos (a small section running in between houses, potential easement) Location: Deerbrook Drive between Del Roy Drive and North Twin Oaks Valley Road Storm Hotspot: No
Upstream Tie-in: 36” RCP
Downstream Tie-in: 54” RCP
Contributing area: 100 acres (residential and hillside runoff) Constraint: FEMA floodplain downstream
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
Potential CIP Opportunity 4: Upsizing 78” RCP System and realigning to be within the public ROW along Vineyard Road between Borden Road and Woodland Street Subcatchment: A1
Jurisdiction: City of San Marcos (a small section running in between houses, potential easement) Location: Vineyard Road between Borden Road and Woodland Street Storm Hotspot: No
Upstream Tie-in: 72” RCP
Downstream Tie-in: 78” RCP
Contributing area: 120 acres (residential and hillside runoff) This was not selected as a CIP because of this would increase peak runoff to FEMA mapped creek downstream
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
Potential CIP Opportunity 5: Upsizing 54” RCP System along Carriage Drive between Road Ranch Road Borden Road and Mulberry Drive
Subcatchment: A1
Jurisdiction: City of San Marcos (a small section running in between houses can be realigned to be within the public ROW)
Location: Vineyard Road between Borden Road and Woodland Street Storm Hotspot: No
Upstream Tie-in: 72” RCP
Downstream Tie-in: 78” RCP
Contributing area: 120 acres (residential and hillside runoff) Additional notes: Will have to go against grade in the downstream portion.
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
Potential CIP Opportunity 6: Upsizing 27” RCP System along Applewilde Drive between Via Vera Cruz and Discovery Street
Subcatchment: A4
Jurisdiction: City of San Marcos
Location: Applewilde Drive between Via Vera Cruz and Discovery Street Storm Hotspot: No
Upstream Tie-in: 24” RCP
Downstream Tie-in: 48” RCP
Contributing area: 60 acres (mostly residential)
Reason for not selecting is the increase of flows to the Creek district downstream.
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
Potential CIP Opportunity 7 (1): Upsizing 27” RCP Culvert at North Las Posas Road and Avenida Azul Subcatchment: A3
Jurisdiction: City of San Marcos
Location: North Las Posas Road and Avenida Azul
Storm Hotspot: No
Upstream Tie-in: 24” RCP
Downstream Tie-in: 78” CIPCP
Contributing area: 20 acres (mostly residential)
Additional notes: High priority facilities (Score =85) per priority rating Reason for not selecting is the detention basin downstream.
Potential CIP Opportunity 7 (2): Upsizing dual 48” RCP Culvert at North Las Posas Road and Avenida Azul downstream of detention basin
Subcatchment: A3
Jurisdiction: City of San Marcos
Location: North Las Posas Road and Avenida Azul
Storm Hotspot: Yes
Upstream Tie-in: Detention Basin
Downstream Tie-in: Concrete Channel
Contributing area: 500 acres (mostly residential)
Additional notes: High priority facilities (Score =85) per priority rating Reason for not selecting is the detention basin upstream.
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
Potential CIP Opportunity 8: Upsizing 24” RCP to storm drain sizes varying from 36” RCP to 60” RCP Subcatchment: A1
Jurisdiction: City of San Marcos
Location: Auburn Avenue to Vineyard Road
Storm Hotspot: No
Downstream Tie-in: 84” RCP
Contributing area: 35 acres (mostly residential)
Reason for not selecting: Small contributing area and ROW. This project can be combined with Potential Opportunity No. 6. However, increasing peak flows to downstream FEMA mapped creek is a constraint.
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
Potential CIP Opportunity 9: Upsizing 15” RCP and 24” RCP to 30” RCP Subcatchment: A1
Jurisdiction: City of San Marcos
Location: San Marcos Boulevard and West Mission Road
Storm Hotspot: No
Downstream Tie-in: 11’ W x 10’ H
Contributing area: 22 acres (mostly residential)
Reason for not selecting: Small contributing area
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
Potential CIP Opportunity 10: Upsizing 30” RCP system to 48” RCP system Subcatchment: A3
Jurisdiction: City of San Marcos
Location: Parking lot west of Via Vera Cruz and West San Marcos Boulevard.
Storm Hotspot: No
Downstream Tie-in: Concrete channel
Contributing area: 75 acres (mostly commercial)
Reason for not selecting: Floodplain downstream
J#17729 San Marcos DMP
Potential CIP Opportunities
J#17729 San Marcos DMP
Potential CIP Opportunities
Potential CIP Opportunity 11: Upsizing 30” RCP system to 42” RCP Subcatchment: A3
Jurisdiction: City of San Marcos
Location: Starstone Drive and Commodore Drive.
Storm Hotspot: No
Downstream Tie-in: Channel
Contributing area: 30 acres (mostly commercial)
Reason for not selecting: Ownership (private parcel). Realignment required.
J#17729 San Marcos DMP
Potential CIP Opportunities
Appendix J
Backup of Hydrologic Parameters for Specific Plan Areas San Marcos DMP GPLU Hydrologic Parameters
Code Cnt_Code Last_Desig Last_Des_1 Last_Densi Percent Impervious N‐Impervious N‐Pervious Notes n PI 72 Public/Institutional U Max 3.0 FAR 85 0.012 0.1 0.85 0.0252 MU 192 Mixed Use 1 S Max 1.75 FAR, 20.1‐30.0 du/ac 80 0.012 0.1 0.8 0.0296OP 28 Office Professional RES 4‐8 Max 1.50 FAR 90 0.012 0.1 0.9 0.0208 BP 21 Business Park Estate Residential 1‐2 du/ac Max 1.20 FAR 80 0.012 0.1 0.8 0.0296 C 183 Commercial S Max 0.70 FAR 85 0.012 0.1 0.85 0.0252 LI 208 Light Industrial SPA Max 0.60 FAR 90 0.012 0.1 0.9 0.0208 I 248 Industrial SPA Max 0.50 FAR 95 0.012 0.1 0.95 0.0164NC 10 Neighborhood Commercial RES 2‐4 Max 0.30 FAR 80 0.012 0.1 0.8 0.0296MHDR 63 Medium High Density Residential SPA C 20.1‐30.0 du/ac 80 0.012 0.1 0.8 0.0296 MDR2 174 Medium Density Residential 2 RES 8‐12 15.1‐20.0 du/ac 65 0.012 0.1 0.65 0.0428 MDR1 326 Medium Density Residential 1 S 12.1‐15.0 du/ac 50 0.012 0.1 0.5 0.056 LMDR 496 Low Medium Density Residential RES 8‐12 8.1‐12.0 du/ac 45 0.012 0.1 0.45 0.0604 LDR 2363 Low Density Residential S 4.1‐8.0 du/ac 40 0.012 0.1 0.4 0.0648 VLDR 4234 Very Low Density Residential SPA C 2.1‐4.0 du/ac 30 0.012 0.1 0.3 0.0736RR 915 Rural Residential SPA OS2 1.0‐2.0 du/ac, max 2.0 du/ac 20 0.012 0.1 0.2 0.0824HR2 8 Hillside Residential 2 HILL RES .25‐.50 0.25‐0.5 du/acre, depending on sl 10 0.012 0.1 0.1 0.0912 HR1 87 Hillside Residential 1 HILL RES .05‐.25 0.05‐0.25 du/acre, depending on s 5 0.012 0.1 0.05 0.0956 COUNTY RR 2 County Rural Residential RU RES .125‐1 20 0.012 0.1 0.2 0.0824 AG 1278 Agricultural/Residential SPA SFD .125‐1 0.125‐1.0 dwelling unit (du) per pa 30 0.012 0.1 0.3 0.0736 OS 496 Open Space SPA SMCRRA 0 0.012 0.1 0 0.1P 86 Parks SPA SFD 2‐4 5 0.012 0.1 0.05 0.0956SPA 8939 Specific Plan Area Specific Plan Area 65 0.012 0.1 0.65 0.0428 SPA1 Assumed Medium Density Residential 2 65 0.012 0.1 0.65 0.0428 SPA2 Assumed Medium Density Residential 2 65 0.012 0.1 0.65 0.0428SPA3 Assumed Medium Density Residential 2 65 0.012 0.1 0.65 0.0428SPA4 Assumed Medium Density Residential 2 65 0.012 0.1 0.65 0.0428SPA5 Assumed Medium High Density Residential 80 0.012 0.1 0.8 0.0296Roads 95 0.012 0.1 0.95 0.0164*FAR = Floor area ratio *DUA = Dwelling units per acre*N‐Impervious and N‐Impervious values are default from San Diego County BMP Design Manual (2016) W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
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San Marcos DMP GPLU Hydrologic Parameters
PLU First_PLANNEDLU Percent Impervious N‐Impervious N‐Pervious Notes n 1000 Spaced Rural Residential 10 0.012 0.1 0.1 0.0912 Very Low Density Residential 1100 Single Family Residential 30 0.012 0.1 0.3 0.0736 Agricultural/Residential1110 Single Family Detached 45 0.012 0.1 0.45 0.0604 Low Medium Density Residential 1120 Single Family Multiple‐Units 80 0.012 0.1 0.8 0.0296 Medium High Density Residential 1190 Single Family Residential Without Units 45 0.012 0.1 0.45 0.0604 Low Medium Density Residential 1200 Multi‐Family Residential 80 0.012 0.1 0.8 0.0296 Medium High Density Residential1290 Multi‐Family Residential Without Units 80 0.012 0.1 0.8 0.0296 Medium High Density Residential 1300 Mobile Home Park 45 0.012 0.1 0.45 0.0604 Low Medium Density Residential 1409 Other Group Quarters Facility 65 0.012 0.1 0.65 0.0428 Medium Density Residential 2 2101 Industrial Park 95 0.012 0.1 0.95 0.0164 Industrial 2103 Light Industry ‐ General 90 0.012 0.1 0.9 0.0208 Light Industrial2104 Warehousing 95 0.012 0.1 0.95 0.0164 Industrial2105 Public Storage 95 0.012 0.1 0.95 0.0164 Industrial4111 Rail Station/Transit Center 80 0.012 0.1 0.8 0.0296 Mixed Use 1 4112 Freeway 90 0.012 0.1 0.9 0.02084113 Communications and Utilities 85 0.012 0.1 0.85 0.0252 Public/Institutional 4114 Parking Lot ‐ Surface 80 0.012 0.1 0.8 0.0296 Mixed Use 1 4116 Park and Ride Lot 80 0.012 0.1 0.8 0.0296 Mixed Use 14117 Railroad Right of Way 50 0.012 0.1 0.5 0.0564118 Road Right of Way 95 0.012 0.1 0.95 0.01644119 Other Transportation 95 0.012 0.1 0.95 0.01645003 Community Shopping Center 85 0.012 0.1 0.85 0.0252 Commercial 5004 Neighborhood Shopping Center 85 0.012 0.1 0.85 0.0252 Commercial5007 Arterial Commercial 85 0.012 0.1 0.85 0.0252 Commercial5008 Service Station 95 0.012 0.1 0.95 0.0164 Industrial5009 Other Retail Trade and Strip Commercial 85 0.012 0.1 0.85 0.0252 Commercial 6002 Office (Low‐Rise) 90 0.012 0.1 0.9 0.0208 Office Professional 6102 Religious Facility 90 0.012 0.1 0.9 0.0208 Office Professional 6105 Fire/Police Station 90 0.012 0.1 0.9 0.0208 Office Professional 6109 Other Public Services 85 0.012 0.1 0.85 0.0252 Public/Institutional 6509 Other Health Care 90 0.012 0.1 0.9 0.0208 Office Professional6805 Junior High School or Middle School 85 0.012 0.1 0.85 0.0252 Public/Institutional 6806 Elementary School 85 0.012 0.1 0.85 0.0252 Public/Institutional 6809 Other School 85 0.012 0.1 0.85 0.0252 Public/Institutional7204 Golf Course 5 0.012 0.1 0.05 0.0956 Parks7205 Golf Course Clubhouse 85 0.012 0.1 0.85 0.0252 Commercial7601 Park ‐ Active 5 0.012 0.1 0.05 0.0956 Parks7603 Open Space Park or Preserve 0 0.012 0.1 0 0.1 Open Space 7606 Landscape Open Space 5 0.012 0.1 0.05 0.0956 Parks7607 Residential Recreation 5 0.012 0.1 0.05 0.0956 Parks7609 Undevelopable Natural Area 0 0.012 0.1 0 0.1 Open Space W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
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San Marcos DMP GPLU Hydrologic Parameters
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
PI 72 Public/Institutional U Max 3.0 FAR
%Impervious 85
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
MU1 192 Mixed Use 1 S Max 1.75 FAR, 20.1‐30.0 du/ac
%Impervious 80
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
OP 28 Office Professional RES 4‐8 Max 1.50 FAR
%Impervious 70
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
BP 21 Business Park Estate Residential 1‐2 du/ac Max 1.20 FAR %Impervious 80
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
C 183 Commercial S Max 0.70 FAR
%Impervious 85
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
LI 208 Light Industrial SPA Max 0.60 FAR
%Impervious 90
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
I 248 Industrial SPA Max 0.50 FAR
%Impervious 95
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
NC 10 Neighborhood Commercial RES 2‐4 Max 0.30 FAR
%Impervious 80
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
MHDR 63 Medium High Density Residential SPA C 20.1‐30.0 du/ac %Impervious 80
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
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San Marcos DMP GPLU Hydrologic Parameters
MDR2 174 Medium Density Residential 2 RES 8‐12 15.1‐20.0 du/ac %Impervious 65
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
MDR1 326 Medium Density Residential 1 S 12.1‐15.0 du/ac %Impervious 50
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
LMDR 496 Low Medium Density Residential RES 8‐12 8.1‐12.0 du/ac %Impervious 45
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
LDR 2363 Low Density Residential S 4.1‐8.0 du/ac
%Impervious 40
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
VLDR 4234 Very Low Density Residential SPA C 2.1‐4.0 du/ac %Impervious 30
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
RR 915 Rural Residential SPA OS2 1.0‐2.0 du/ac, max 2.0 du/ac %Impervious 20
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
HR2 8 Hillside Residential 2 HILL RES .25‐.50 0.25‐0.5 du/acre, depending on slope %Impervious 10
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
HR1 87 Hillside Residential 1 HILL RES .05‐.25 0.05‐0.25 du/acre, depending on slope %Impervious 5
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
COUNTY RR 2 County Rural Residential RU RES .125‐1
%Impervious 15
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
AG 1278 Agricultural/Residential SPA SFD .125‐1 0.125‐1.0 dwelling unit (du) per parcel based on location and slope %Impervious 30
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
OS 496 Open Space SPA SMCRRA
%Impervious 0
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
P86 Parks SPA SFD 2‐4
%Impervious 5
W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016
San Marcos DMP GPLU Hydrologic Parameters
SPA 8939 Specific Plan Area Specific Plan Area
SPA1 %Impervious 65SPA2 %Impervious 65SPA3 %Impervious 65SPA4 %Impervious 65SPA5 %Impervious 80 W:\17729_SanMarcosDMP\WaterResources\3_H&H_Analysis\ModelingParameters\HydrologicParameters.xlsx Rick Engineering Company
J# 17729
11/21/2016