1. TMDL Modeling Toolbox WAM - Flow and Nutrient Load Modeling Tool for TMDL Development Del Bottcher, Ph.D., P.E. Barry Jacobson, Ph.D., P.E. Soil & Water Engineering Technology, Inc. Jeff Hiscock JGH Engineering

2. TMDL Modeling Toolbox - WAM Watershed Assessment Model Presentation Outline What is WAM good for?What is WAM good for? Conceptual DesignConceptual Design User InterfaceUser Interface ImplementationsImplementations Recent & Future EnhancementsRecent & Future Enhancements

3. TMDL Modeling Toolbox - WAM What is it good for? Help develop pollutant load allocations for TMDLsHelp develop pollutant load allocations for TMDLs Identify “hot spots”Identify “hot spots” Rank pollution by sources & sub-basinsRank pollution by sources & sub-basins Assess growth directions and individual development projectsAssess growth directions and individual development projects Assess abatement strategies (BMPs)Assess abatement strategies (BMPs) Develop STA and RASTA design parametersDevelop STA and RASTA design parameters Analyze effectiveness of STAs and RASTAsAnalyze effectiveness of STAs and RASTAs

4. TMDL Modeling Toolbox - WAM Simulates Surface and Ground Water FlowSurface and Ground Water Flow –backflow –multiple inlets / outlets –reaches that dry out Water QualityWater Quality –Suspended Solids, Sediment N, Sediment P, Soluble N, Soluble P, and BOD) - (Bacteria, Toxins) –Chlorophyll-a, dissolved oxygen (using WASP linkage) Daily outputs at source cells, subbasins, and individual stream reachesDaily outputs at source cells, subbasins, and individual stream reaches

5. TMDL Modeling Toolbox - WAM Suitable for Varied conditions Soils handled from hills to flatwoodsSoils handled from hills to flatwoods Rural and urban land usesRural and urban land uses Management practicesManagement practices Surface / groundwater interactionsSurface / groundwater interactions Spatially distributed rainfall (NEXRAD)Spatially distributed rainfall (NEXRAD) Point source dischargesPoint source discharges Fine spatial resolution yield high detailFine spatial resolution yield high detail

6. TMDL Modeling Toolbox - WAM Widely Tested and Used Florida Department of Environmental ProtectionFlorida Department of Environmental Protection Natural Resources Conservation ServiceNatural Resources Conservation Service Department of Agriculture and Consumer ServicesDepartment of Agriculture and Consumer Services Environmental Protection AgencyEnvironmental Protection Agency St Johns Water Management DistrictSt Johns Water Management District Suwannee River Water Management DistrictSuwannee River Water Management District South Florida Water Management DistrictSouth Florida Water Management District NIWA – New Zealand National WQ CenterNIWA – New Zealand National WQ Center Florida Department of Agriculture & Consumer ServicesFlorida Department of Agriculture & Consumer Services

7. Depression Overland Wetland Stream Flow Routing Grid Cell Basin Outlet GW Wetland (1 ha) Spatial Definition and Mapping Detailed Land Use and Soils Interactions Customized Source Cell Submodels Individual Reach Routing Wetland and Depression Handling How WAM Works

8. TMDL Modeling Toolbox - WAM Unique Cell ModelUnique Cell Model –GLEAMS hydrologic transport model –EAAMOD hydrologic transport model –urban and wetlands submodels Dynamic Routing ModelDynamic Routing Model –hydrodynamic routing based on Manning’s equation –attenuation based on flow rate, characteristics of flow path, and flow distance –coefficients for different wetland and stream types Modeling Approach

9. TMDL Modeling Toolbox - WAM

14. Cross Bayou Watershed Assessment Model

15. TMDL Modeling Toolbox - WAM Suwannee River Nitrate Assessment

16. Ranking of Land Uses for Nitrate Row Crops Poultry Litter Application Dairies Septic Tanks Observed Data

17. New Zealand – Okura Basin

18. TMDL Modeling Toolbox - WAM Verified that model could be used for ungaged basins by use of two gaged basinsVerified that model could be used for ungaged basins by use of two gaged basins St. Johns River Application

19. Farm-Version of WAM

20. TMDL Modeling Toolbox - WAM Structures at Myakka River State Park

24. Flow at Structure S191

25. Phosphorus Concentration – TCNS213

26. TMDL Modeling Toolbox - WAM SUMMARY OF FEATURES Generation of Typical FarmsGeneration of Typical Farms BMPs Build In and Easily ModifiedBMPs Build In and Easily Modified Rain zones built into unique cellsRain zones built into unique cells Full erosion/deposition in stream routing - pond/reservoirsFull erosion/deposition in stream routing - pond/reservoirs Closed basins/depressions handledClosed basins/depressions handled Vegetative areas in residential/urban simulated separatelyVegetative areas in residential/urban simulated separately Point Sources with Service AreasPoint Sources with Service Areas Urban / Agricultural Retention PondsUrban / Agricultural Retention Ponds Impervious Sediment Buildup/Wash offImpervious Sediment Buildup/Wash off Shoreline reaches for more precise delivery to rivers/lakes/estuariesShoreline reaches for more precise delivery to rivers/lakes/estuaries Hydraulic StructuresHydraulic Structures

27. TMDL Modeling Toolbox - WAM RecentRecent –Enhanced flow control structures –Incorporation of WASP –Stream / groundwater interactions –NEXRAD analyses –Reduced run-times –Looped stream systems Coming SoonComing Soon –ArcView 8.x upgrade –Cost Analyses with Optimization New Developments

28. TMDL Modeling Toolbox SWET Link from ToolBox www.swet.com