©Geosyntec Consultants 2013
September 17, 2013
(Presented at the request of the City of Los Angeles)
SBPAT:
MODELING OPTIO...
DISCLAIMER
This presentation is provided for informational purposes, and
does not advocate or promote a specific approach ...
AGENDA
©Geosyntec Consultants 2013
• Introduction to SBPAT for RAA
• Input types and inputting processes
• Target loading ...
(ENHANCED) WATERSHED MANAGEMENT PROGRAM
©Geosyntec Consultants 2013
Identify suitable
locations (regional
retention)
Ident...
PERMIT PROVISION C.5.B.IV(5)
(5) Permittees shall conduct a Reasonable Assurance Analysis for each water body-pollutant
co...
STRUCTURAL BMP PRIORITIZATION AND
ANALYSIS TOOL (SBPAT)
©Geosyntec Consultants 2013
• SBPAT is:
• Public domain, “open sou...
1. Identify
Priority
Areas
2. Identify
Opportunities
3. Assess
Candidate
BMPs
4. Evaluate
BMP
Effectiveness
BASIC
STEPS
ww...
Based On
• Defined catchment areas
• Pollutant loading from
catchments
• Pollutant priorities
• severity and cause of impa...
PRIORITIZATION DATA
Simple Calculation Methodologies
Stakeholder
Driven Inputs
to support
prioritization**
Regularly Updat...
• BMP Types (Regional,
Distributed, Institutional)
• Opportunity Screening Process
• Parcels, Roadways, Storm Drains
• BMP...
Different Infrastructure/Retrofit Conditions than Distributed BMPs
Multiple Types of Regional BMPs (such as Infiltration o...
3. ASSESS CANDIDATE BMPS
Effectiveness
Ease of
Implementation
Cost
Other
Benefits
Links Pollutant-
specific BMP
Performanc...
4. EVALUATE BMP EFFECTIVENESS FOR
REASONABLE ASSURANCE ANALYSIS
Stormwater Modeling Parameters PROJECT
PERFORMANCE
Spatial...
BMP DATABASE STATISTICS (2012 UPDATE)
©Geosyntec Consultants 2013
14
STORMWATER MODELING ELEMENTS
©Geosyntec Consultants 2013
• EPA SWMM4.4h (modified) accounts for:
• Continuous hydrologic r...
WHAT IS MONTE CARLO?
©Geosyntec Consultants 2013
16
LU EMC BMP
effluent
runoff= >
% treated
Compute load for
each storm
x ...
HOW TO USE SBPAT OUTPUT
©Geosyntec Consultants 2013
• Establish target load reductions
• Build menu of structural BMPs
• P...
EXAMPLE SELECTED STUDY AREA
©Geosyntec Consultants 2013
18
EXAMPLE CATCHMENT LAND USES
Land Use Group Acreage
Commercial 55.4
Education 20.9
Industrial 103.2
MF Residential 39.4
Tra...
EXAMPLE DISTRIBUTED BMP ASSIGNMENTS
Land Use Group Cisterns Bioretention
Perm.
Pavement
Media
Filters
Commercial 0% 0% 20%...
• Infiltration basin
• Total study area
properties:
• 7 catchments,
• 238 acres,
• 85% impervious
• Example design storm
s...
0
5
10
15
20
25
30
2/20/00 2/21/00 2/22/00 2/23/00 2/24/00 2/25/00
ModelFlows,cfs
Inflow Outflow Bypass Evaporation Infilt...
EXAMPLE DETAILED MONTE CARLO RESULTS (EVENT TIME STEP)
©Geosyntec Consultants 2013
0
20
40
60
80
100
120
140
160
180
Event...
EXAMPLE MODEL OUTPUT – ANNUAL AVERAGES
©Geosyntec Consultants 2013
24
Compare to
Target Load
Reductions to
Establish RAA
EXAMPLE MODEL OUTPUT - PLANNING LEVEL
COST ESTIMATES*
*Includes Retrofit Factor
©Geosyntec Consultants 2013
25
EXAMPLE PHASED IMPLEMENTATION
APPROACH
©Geosyntec Consultants 2013
0
10
20
30
40
50
60
70
80
PollutantLoadReduction(lb)
BM...
©Geosyntec Consultants 2013
27
Note: The following method assumes utilization
of SBPAT to establish the target load reduct...
SBPAT-BASED METHOD FOR BMP
QUANTITATIVE ASSESSMENT (BACTERIA)
1) Determine Compliance Metric
17 Annual
Exceedance Days
(AE...
SBPAT-BASED METHOD FOR BMP
QUANTITATIVE ASSESSMENT
1) Determine Compliance Metric
2) Calculate Corresponding Target Load R...
1) Determine Compliance Metric
FIB concentration
criteria
2) Calculate Corresponding Target Load Reduction (TLR)
Pick targ...
SBPAT-BASED METHOD FOR BMP
QUANTITATIVE ASSESSMENT
1) Determine Compliance Metric
2) Calculate Corresponding Target Load R...
SAMPLE RESULTS DEMONSTRATING
REASONABLE ASSURANCE
0
1
10
100
1000
10000
1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61
FCLoa...
©Geosyntec Consultants 2013
33
EXAMPLES OF USES
GLAC IRWMP DATA DEVELOPED COUNTY-WIDE
WET WEATHER WQ
PRIORITIES ASBS
TMDLS 303(D)
© Geosyntec Consultants, Inc. 2013©Geosy...
OCTA MEASURE M2
©Geosyntec Consultants 2013
35
OCTA MEASURE M2
GOOGLE EARTH APPLICATIONS DEVELOPED
©Geosyntec Consultants 2013
36
BALLONA CREEK (LOS ANGELES COUNTY)
©Geosyntec Consultants 2013
37
WQ Priorities
BALLONA CREEK (LOS ANGELES COUNTY)
©Geosyntec Consultants 2013
38
WQ Opportunities
• Area downstream of
reservoir analyzed
• Larger Land Area Studied
(~350 sq. miles study
area)
• More Agriculture LU
• Mor...
SAN DIEGO RIVER & SAN LUIS REY
CATCHMENT PRIORITIZATION INDICES (CPI)
©Geosyntec Consultants 2013
40
SAN LUIS REY WATERSHED PRELIMINARY
PLANNING LEVEL – RANGE OF EFFECTIVENESS
©Geosyntec Consultants 2013
BMP CATEGORY
FC Loa...
©Geosyntec Consultants 2013
(provided for information an discussion only)
CONSIDERATION OF MODELS
TOGETHER
42
MODELING CONTINUUM
WMMSSBPAT
Model Functionalities for RAA
• Establish Target Load Reductions
• Estimate reductions achiev...
Ouput: Load reduction targets, potential BMP utilization,
and cost by subwatershed
Output: feasibility, load reductions, c...
SUMMARY
©Geosyntec Consultants 2013
• Introduction to SBPAT for RAA
• Input types and inputting processes
• Target loading...
QUESTIONS
ksusilo@geosyntec.com
©Geosyntec Consultants 2013
46
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SBPAT for RAA (2013-09-17)

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Presentation of the Structural BMP Prioritization and Analysis Tool (SBPAT) to the Los Angeles MS4 Permitee's Reasonable Assurance Analysis Subcommittee of the Technical Advisory Committee (presented 9/17/2013 by K. Susilo)

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SBPAT for RAA (2013-09-17)

  1. 1. ©Geosyntec Consultants 2013 September 17, 2013 (Presented at the request of the City of Los Angeles) SBPAT: MODELING OPTIONS IN SUPPORT OF REASONABLE ASSURANCE ANALYSES (RAA) COMPLIANT WITH R4-2012-0175 (LOS ANGELES MS4 PERMIT) 1
  2. 2. DISCLAIMER This presentation is provided for informational purposes, and does not advocate or promote a specific approach to conducting Reasonable Assurance Analyses (RAAs). No warranty is implied or expressed. Geosyntec shall not be held responsible for any unauthorized use or redistribution. Note that the information presented herein is subject to change. ©Geosyntec Consultants 2013 2
  3. 3. AGENDA ©Geosyntec Consultants 2013 • Introduction to SBPAT for RAA • Input types and inputting processes • Target loading estimates/other implicit assumptions • Format for information sharing, presentation, and use for decision support • Quantified results • Use of SBPAT results • Target load reduction discussion • Examples • Potential Integration of multiple models 3
  4. 4. (ENHANCED) WATERSHED MANAGEMENT PROGRAM ©Geosyntec Consultants 2013 Identify suitable locations (regional retention) Identify treatment strategies Prioritize sources Assess feasibility Evaluate regulatory/ permitting issues Identify potential funding sources RAA (WQS compliance demonstration) Identify WQ compliance priorities Perform outreach Estimate cost Develop implementation schedule Identify (numeric) interim milestones & compliance schedules (for EPA TMDLs) Identify WCMs 4
  5. 5. PERMIT PROVISION C.5.B.IV(5) (5) Permittees shall conduct a Reasonable Assurance Analysis for each water body-pollutant combination addressed by the WatershedManagement Program. A Reasonable Assurance Analysis (RAA) shall be quantitative and performed using a peer-reviewed model in the public domain. Models to be considered for the RAA, without exclusion, are the Watershed Management Modeling System (WMMS), Hydrologic Simulation Program-FORTRAN (HSPF), and the Structural BMP Prioritization and Analysis Tool (SBPAT). The RAA shall commence with assembly of all available, relevant subwatershed data collected within the last 10 years, including land use and pollutant loading data, establishment of quality assurance/quality control (QA/QC) criteria, QA/QC checks of the data, and identification of the data set meeting the criteria for use in the analysis. Data on performance of watershed control measures needed as model input shall be drawn only from peer-reviewed sources. These data shall be statistically analyzed to determine the best estimate of performance and the confidence limits on that estimate for the pollutants to be evaluated. The objective of the RAA shall be to demonstrate the ability of Watershed Management Programs and EWMPs to ensure that Permittees’ MS4 discharges achieve applicable water quality based effluent limitations and do not cause or contribute to exceedances of receiving water limitations. ©Geosyntec Consultants 2013 5
  6. 6. STRUCTURAL BMP PRIORITIZATION AND ANALYSIS TOOL (SBPAT) ©Geosyntec Consultants 2013 • SBPAT is: • Public domain, “open source” GIS-based water quality analysis tool • Two major components: • Selection and Siting of BMPs • user-defined priorities • multiple pollutants • Quantification of pollutant reduction • Establishment of target load reductions (TLR) • Land use storm event pollutant concentrations • EPA-SWMM • USEPA/ASCE International BMP Database • Site and watershed-specific data • Monte Carlo approach 6
  7. 7. 1. Identify Priority Areas 2. Identify Opportunities 3. Assess Candidate BMPs 4. Evaluate BMP Effectiveness BASIC STEPS www.sbpat.net Original funding by agencies, SWRCB and RWQCB 7©Geosyntec Consultants 2013 7
  8. 8. Based On • Defined catchment areas • Pollutant loading from catchments • Pollutant priorities • severity and cause of impairments of receiving waters • TMDLs/303(d) listings • Stakeholder input Result • Catchment Priority Index (CPI) built from multiple pollutant loading model analyses 1. IDENTIFY PRIORITY AREAS FOR BMP IMPLEMENTATION ©Geosyntec Consultants 2013 2700 Catchment Areas 8 Permit Requirement
  9. 9. PRIORITIZATION DATA Simple Calculation Methodologies Stakeholder Driven Inputs to support prioritization** Regularly Updated with New Data* (built in) ©Geosyntec Consultants 2013 Pollutant Loading Based on Land Use Pollutant Priorities Reflected in Assigned Weights *Updated through efforts in San Diego and Orange County **TMDL = Category 1; 303(d) = Category 2; etc. 9 RESULT: CUSTOMIZED OPTIMAL SOLUTION
  10. 10. • BMP Types (Regional, Distributed, Institutional) • Opportunity Screening Process • Parcels, Roadways, Storm Drains • BMP Opportunity Maps • Available Space • Ownership • Slopes, Liquefaction Zones • Environmental Priority • Link Priority to Opportunity 2. IDENTIFY OPPORTUNITIES ©Geosyntec Consultants 2013 10 Stakeholder Driven Inputs (Supports Opportunity Development)
  11. 11. Different Infrastructure/Retrofit Conditions than Distributed BMPs Multiple Types of Regional BMPs (such as Infiltration or Wetlands) Analyzed REGIONAL BMPS © Geosyntec Consultants, Inc. 2013 11
  12. 12. 3. ASSESS CANDIDATE BMPS Effectiveness Ease of Implementation Cost Other Benefits Links Pollutant- specific BMP Performance to Management Priorities ©Geosyntec Consultants 2013 12 Stakeholders inform implementation priorities (relative importance) Triple Bottom Line Potential Optimization
  13. 13. 4. EVALUATE BMP EFFECTIVENESS FOR REASONABLE ASSURANCE ANALYSIS Stormwater Modeling Parameters PROJECT PERFORMANCE Spatial Data Sets Meteorology BMP Costs BMP Effectiveness Land Use Runoff Concentrations BMP Design Attributes Storm Drains Land Uses Subwatersheds/ Catchments Parcels BMP Prioritization Methodology SWMM Monte Carlo Prioritization Component Modeling Component ©Geosyntec Consultants 2013 13 Evaluate performance relative to: •Load reduction •Frequency reduction •Costs •Risk
  14. 14. BMP DATABASE STATISTICS (2012 UPDATE) ©Geosyntec Consultants 2013 14
  15. 15. STORMWATER MODELING ELEMENTS ©Geosyntec Consultants 2013 • EPA SWMM4.4h (modified) accounts for: • Continuous hydrologic response and hydrologic performance of BMPs • Antecedent moisture conditions • Transient storage conditions • Monte Carlo event simulation accounts for: • Tributary area properties • Interdependence of selected distributed/regional BMP types • Antecedent conditions • BMP volume, treatment rates, volume reduction processes and transient storage conditions • Observed variability in runoff quality • Observed variability in BMP effluent quality 15
  16. 16. WHAT IS MONTE CARLO? ©Geosyntec Consultants 2013 16 LU EMC BMP effluent runoff= > % treated Compute load for each storm x 10,000 times Loads SWMM runoff volumes EMCs 25th-75th Percentile Range Percent of results above WQS
  17. 17. HOW TO USE SBPAT OUTPUT ©Geosyntec Consultants 2013 • Establish target load reductions • Build menu of structural BMPs • Performance, costs, uncertainties quantified • Provide transparent understanding of “role” of each menu item in phased compliance strategy • Demonstrate target load reductions have been met (event, annual, and long term basis) • Describe variability and associated uncertainty 17
  18. 18. EXAMPLE SELECTED STUDY AREA ©Geosyntec Consultants 2013 18
  19. 19. EXAMPLE CATCHMENT LAND USES Land Use Group Acreage Commercial 55.4 Education 20.9 Industrial 103.2 MF Residential 39.4 Transportation 16.1 Vacant/Open Space 2.7 Total 237.6 ©Geosyntec Consultants 2013 19
  20. 20. EXAMPLE DISTRIBUTED BMP ASSIGNMENTS Land Use Group Cisterns Bioretention Perm. Pavement Media Filters Commercial 0% 0% 20% 20% Education 20% 30% 0% 0% Industrial 0% 0% 30% 50% MF Residential 30% 20% 0% 0% Transportation 0% 0% 0% 80% Distributed BMP Acreage Treated Default Design Size Cisterns 10.8 0.75 in Bioretention 10.0 0.75 in Permeable Pavement 38.6 38.6 acres Media Filters 69.1 0.2 in/hr Total Impervious Area Treated By Distributed BMPs 118.1 % of Total Impervious Area in Study Area 58% ©Geosyntec Consultants 2013 20 Default, but can be modified for site-specific constraints
  21. 21. • Infiltration basin • Total study area properties: • 7 catchments, • 238 acres, • 85% impervious • Example design storm sizing approach: • 0.75-inch storm runoff • 7.9 ac-ft • 4 ft storage depth @ 1.2 in/hr design infiltration rate = 40 hour drawdown EXAMPLE REGIONAL BMP* SIZING Total Runoff from Study Area (includes effect of distributed BMPs if applied) Diversion Structure Online or offline? Ifoffline: Diversion Q is specified Overflow Structure Depthabove bottom InfiltrationBasin Volume-Area Table Ksat– underlying soils Underlying Infiltation Rate user-specified oradjusted fromstudy area average, computed per area computed in stage-area relationships Flexible inputs to analyze surface or sub-surface infiltration system * Could include functionally regional projects that do not meet regulatory definition at time of construction 21 85th Percentile to meet regional proj. def’n.*
  22. 22. 0 5 10 15 20 25 30 2/20/00 2/21/00 2/22/00 2/23/00 2/24/00 2/25/00 ModelFlows,cfs Inflow Outflow Bypass Evaporation Infiltration • Tracks inflow, treated discharge, bypass, evaporation and infiltration at each 10 minute time step • Discretizes runoff events by 6 hour minimum interevent time in rainfall record • Tracks volume through BMP; summarizes by storm event • Produces table of BMP hydrologic performance by storm event EXAMPLE SWMM CONTINUOUS SIMULATION AND STORM EVENT TRACKING StartofInflow:Storm490 StartofOutflow:Storm490 EndofInflow:Storm490 StartofInflow:Storm491 EndofOutflow:Storm490 StartofOutflow:Storm491 Storm Event Volumes, cu-ft Event No. Inflow Infiltration Evaporation Bypass Outflow % Capture % Lost 486 48,600 16,300 136 0 34,000 100 33.5 487 185,000 28,500 237 0 157,000 100 15.4 488 34,700 15,400 129 0 19,200 100 44.3 489 54,600 17,900 239 0 36,500 100 32.8 490 774,000 59,500 793 52,700 663,000 93.2 7.7 491 444,000 42,600 568 0 399,000 100 9.6 Input to Monte Carlo WQ Analysis ©Geosyntec Consultants 2013 22
  23. 23. EXAMPLE DETAILED MONTE CARLO RESULTS (EVENT TIME STEP) ©Geosyntec Consultants 2013 0 20 40 60 80 100 120 140 160 180 EventRunoffVolume,ac-ft 0 2 4 6 8 10 12 14 16 18 20 TotalCopperEventMeanConcentration (ug/L) 0 1 2 3 4 5 6 7 8 TotalCopperEventLoad(lbs) Example Hydrograph Example Time Series of Concentrations Example Time Series of Loads Error bars represent one standard deviation Plots show a subset of the simulated period of record 23
  24. 24. EXAMPLE MODEL OUTPUT – ANNUAL AVERAGES ©Geosyntec Consultants 2013 24 Compare to Target Load Reductions to Establish RAA
  25. 25. EXAMPLE MODEL OUTPUT - PLANNING LEVEL COST ESTIMATES* *Includes Retrofit Factor ©Geosyntec Consultants 2013 25
  26. 26. EXAMPLE PHASED IMPLEMENTATION APPROACH ©Geosyntec Consultants 2013 0 10 20 30 40 50 60 70 80 PollutantLoadReduction(lb) BMP Category 3 BMP Category 2 BMP Category 1 NS Example Target Load Reduction 26 Demonstration that selected control measures have reasonable assurance to meet interim and final WQBELs and RWL milestones.
  27. 27. ©Geosyntec Consultants 2013 27 Note: The following method assumes utilization of SBPAT to establish the target load reductions; other methods include utilizing monitoring data to establish ultimate objectives. TARGET LOAD REDUCTION DISCUSSION (BACTERIA)
  28. 28. SBPAT-BASED METHOD FOR BMP QUANTITATIVE ASSESSMENT (BACTERIA) 1) Determine Compliance Metric 17 Annual Exceedance Days (AED) FIB concentration criteria 2) Calculate Corresponding Target Load Reduction (TLR) Pick target year = assume “average” is reasonable Estimate FIB Loads all events: Total and MS4 Estimate MS4 load reduction needed so that small storm days are compliant with TMDL Numeric Targets Conduct storm-by-storm analysis Determine load reduction to achieve AED 3) Analyze Proposed BMPs Calculate total load reduction range Evaluate BMP performance Remove overlapping benefits Determine percentage of total BMP load reduction that is considered effective for AED compliance 4) Compare Effective Load Reduction to TLR Calculate total load reduction that is considered effective for bringing smaller storms into compliance Compare this effective load reduction to TLR developed in Step 2
  29. 29. SBPAT-BASED METHOD FOR BMP QUANTITATIVE ASSESSMENT 1) Determine Compliance Metric 2) Calculate Corresponding Target Load Reduction (TLR) Pick target year = assume “average” is reasonable Estimate FIB Loads all events: Total and MS4 Estimate MS4 load reduction needed so that small storm days are compliant with TMDL Numeric Targets Conduct storm-by-storm analysis Determine load reduction to achieve AED 3) Analyze Proposed BMPs Calculate total load reduction range Evaluate BMP performance Remove overlapping benefits Determine percentage of total BMP load reduction that is considered effective for AED compliance 4) Compare Effective Load Reduction to TLR Calculate total load reduction that is considered effective for bringing smaller storms into compliance Compare this effective load reduction to TLR developed in Step 2
  30. 30. 1) Determine Compliance Metric FIB concentration criteria 2) Calculate Corresponding Target Load Reduction (TLR) Pick target year = assume “average” is reasonable Estimate FIB Loads all events: Total and MS4 Estimate MS4 load reduction needed so that small storm days are compliant with TMDL Numeric Targets Conduct storm-by-storm analysis Determine load reduction to achieve AED 3) Analyze Proposed BMPs Calculate total load reduction range Evaluate BMP performance Remove overlapping benefits Determine percentage of total BMP load reduction that is considered effective for AED compliance 4) Compare Effective Load Reduction to TLR Calculate total load reduction that is considered effective for bringing smaller storms into compliance Compare this effective load reduction to TLR developed in Step 2 SBPAT-BASED METHOD FOR BMP QUANTITATIVE ASSESSMENT AED = 17 Total Volume and Load to be Mitigated to meet 17 day criteria
  31. 31. SBPAT-BASED METHOD FOR BMP QUANTITATIVE ASSESSMENT 1) Determine Compliance Metric 2) Calculate Corresponding Target Load Reduction (TLR) 3) Analyze Proposed BMPs 4) Compare Effective Load Reduction to TLR SBPAT Structural BMPs • Regional • Distributed • Institutional CALCULATE TOTAL LOAD REDUCTION FROM BMPS Non- Structural BMPs • Street Cleaning • LID Ordinances • Incentive Programs • True Source Control Total BMP Load Reductions: • Exclude Non-MS4 Loads • Typical Year • Central Tendencies • Range of Outcomes • Consider Natural Sources
  32. 32. SAMPLE RESULTS DEMONSTRATING REASONABLE ASSURANCE 0 1 10 100 1000 10000 1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61 FCLoad(10^12MPN/Day) Existing FC Load Rank MS4 Load Non-Responsible Parties Load (Indian & Federal) Agriculture Load Allowable Load (Open Space + Caltrans + REC-I WQO (400 MPN/100ml) Agricultural Load Non-MS4 Load MS4 Load Allowable Load Potential Range of Outcomes
  33. 33. ©Geosyntec Consultants 2013 33 EXAMPLES OF USES
  34. 34. GLAC IRWMP DATA DEVELOPED COUNTY-WIDE WET WEATHER WQ PRIORITIES ASBS TMDLS 303(D) © Geosyntec Consultants, Inc. 2013©Geosyntec Consultants 2013 34
  35. 35. OCTA MEASURE M2 ©Geosyntec Consultants 2013 35
  36. 36. OCTA MEASURE M2 GOOGLE EARTH APPLICATIONS DEVELOPED ©Geosyntec Consultants 2013 36
  37. 37. BALLONA CREEK (LOS ANGELES COUNTY) ©Geosyntec Consultants 2013 37 WQ Priorities
  38. 38. BALLONA CREEK (LOS ANGELES COUNTY) ©Geosyntec Consultants 2013 38 WQ Opportunities
  39. 39. • Area downstream of reservoir analyzed • Larger Land Area Studied (~350 sq. miles study area) • More Agriculture LU • More Rural Residential LU • More Septic Influence • 3 Jurisdictions + Caltrans • Area downstream of reservoirs analyzed (~180 sq. miles total study area) • More Urban Area • Larger Population • Large Homeless Population • 5 Jurisdictions + Caltrans • More 303(d) Listings EXAMPLE: SAN DIEGO COUNTY COMPREHENSIVE LOAD REDUCTION PLANS (CLRPS) San Luis Rey River San Diego River ©Geosyntec Consultants 2013 39 New land use and receiving water monitoring data considered in both models 39
  40. 40. SAN DIEGO RIVER & SAN LUIS REY CATCHMENT PRIORITIZATION INDICES (CPI) ©Geosyntec Consultants 2013 40
  41. 41. SAN LUIS REY WATERSHED PRELIMINARY PLANNING LEVEL – RANGE OF EFFECTIVENESS ©Geosyntec Consultants 2013 BMP CATEGORY FC Load Reduction (1012 MPN/YEAR) 1993 WY Load1 [Low-High Range] Non-Structural BMPs 1,000 [260 – 1,700] Regional Structural BMPs 700 [550 -790] Wetland Mitigation Projects 100 [0 -240] Distributed Structural BMPs 370 [200 – 430] Subtotal 2,200 [1,000 -3,200] Load Reduction Adjustment -210 [-63 - -360] Load Reduction Effective Fraction 0.35 Load Reduction Sum 690 [330 - 990] TARGET LOAD REDUCTION 670 Elements Analyzed by SBPAT 41
  42. 42. ©Geosyntec Consultants 2013 (provided for information an discussion only) CONSIDERATION OF MODELS TOGETHER 42
  43. 43. MODELING CONTINUUM WMMSSBPAT Model Functionalities for RAA • Establish Target Load Reductions • Estimate reductions achieved by non-structural BMPs • Evaluate existing BMPs • Site and evaluate new BMPs • Demonstrate TLRs are met • Produce cost estimates MANY POSSIBLE COMBINATIONS ©Geosyntec Consultants 2013 43
  44. 44. Ouput: Load reduction targets, potential BMP utilization, and cost by subwatershed Output: feasibility, load reductions, cost estimates Set additional targets (SBPAT or other) Site and evaluate existing/ planned BMPs using GIS analysis (WMMS or SBPAT) & Non-Structural BMPs Set targets using WMMS model Site and evaluate additional regional BMPs (SBPAT) Output: feasibility, load reductions, cost estimates Assess if targets met Assess if targets met Incorporates receiving water data or other processes Site-level implementability assessment RAA Demonstrated INFORMATION FLOW (DEPENDS ON CONDITIONS) ©Geosyntec Consultants 2013 44
  45. 45. SUMMARY ©Geosyntec Consultants 2013 • Introduction to SBPAT for RAA • Input types and inputting processes • Target loading estimates/other implicit assumptions • Format for information sharing, presentation, and use for decision support • Final quantified and presented results • Use of SBPAT results • Target load reduction discussion • Examples • Potential Integration of multiple models 45
  46. 46. QUESTIONS ksusilo@geosyntec.com ©Geosyntec Consultants 2013 46

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