WAM - Flow and Nutrient Load Modeling Tool for TMDL Development

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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

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Watershed Assessment ModelPresentation Outline

• What is WAM good for?
• Conceptual Design
• User Interface
• Implementations
• Recent Future Enhancements

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What is it good for?

• Help develop pollutant load allocations for TMDLs
• Identify hot spots
• Rank pollution by sources sub-basins
• Assess growth directions and individual
  development projects
• Assess abatement strategies (BMPs)
• Develop STA and RASTA design parameters
• Analyze effectiveness of STAs and RASTAs

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Simulates

• Surface and Ground Water Flow
• backflow
• multiple inlets / outlets
• reaches that dry out
• Water 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 reaches

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Suitable for Varied conditions

• Soils handled from hills to flatwoods
• Rural and urban land uses
• Management practices
• Surface / groundwater interactions
• Spatially distributed rainfall (NEXRAD)
• Point source discharges
• Fine spatial resolution yield high detail

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Widely Tested and Used

• Florida Department of Environmental Protection
• Natural Resources Conservation Service
• Department of Agriculture and Consumer Services
• Environmental Protection Agency
• St Johns Water Management District
• Suwannee River Water Management District
• South Florida Water Management District
• NIWA New Zealand National WQ Center
• Florida Department of Agriculture Consumer
  Services

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How WAM Works
Spatial Definition and Mapping Detailed Land
Use and Soils Interactions Customized
Source Cell Submodels Individual Reach
Routing Wetland and Depression Handling
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Modeling Approach

• Unique Cell Model
• GLEAMS hydrologic transport model
• EAAMOD hydrologic transport model
• urban and wetlands submodels
• Dynamic Routing Model
• hydrodynamic routing based on Mannings equation
• attenuation based on flow rate, characteristics
  of flow path, and flow distance
• coefficients for different wetland and stream
  types

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Watershed Assessment Model
Cross Bayou
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Suwannee River Nitrate Assessment
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Observed Data
Ranking of Land Uses for Nitrate Row
Crops Poultry Litter Application Dairies Septic
Tanks
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New Zealand Okura Basin
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St. Johns River Application

• Verified that model could be used for ungaged
  basins by use of two gaged basins

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Farm-Version of WAM
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Structures at Myakka River State Park
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Flow at Structure S191
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Phosphorus Concentration TCNS213
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SUMMARY OF FEATURES

• Generation of Typical Farms
• BMPs Build In and Easily Modified
• Rain zones built into unique cells
• Full erosion/deposition in stream routing -
  pond/reservoirs
• Closed basins/depressions handled
• Vegetative areas in residential/urban simulated
  separately
• Point Sources with Service Areas
• Urban / Agricultural Retention Ponds
• Impervious Sediment Buildup/Wash off
• Shoreline reaches for more precise delivery to
  rivers/lakes/estuaries
• Hydraulic Structures

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New Developments

• Recent
• Enhanced flow control structures
• Incorporation of WASP
• Stream / groundwater interactions
• NEXRAD analyses
• Reduced run-times
• Looped stream systems
• Coming Soon
• ArcView 8.x upgrade
• Cost Analyses with Optimization

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SWET Link from ToolBox www.swet.com