TMDL Modeling Toolbox Watershed Characterization System (WCS) and its Modeling Extensions Brian Watson Tetra Tech Inc.
TMDL Modeling Toolbox - WCS What Is WCS? • Customization and enhancement of EPA BASINS for EPA Region 4 – Uses ESRI Arc. View-GIS 3. x as a platform – Desktop system – Automated characterization report using spatial databases • Differences between BASINS and WCS – At present, WCS uses only EPA region 4 data, but can be customized for any state – WCS supports various extensions such as Sediment tool, Mercury tool, SWMM, NPSM and LSPC – WCS does not support PLOAD and SWAT
TMDL Modeling Toolbox - WCS Uses • Basic system (core) – Characterize watersheds – Evaluate water quality conditions – Assess potential sources of impairment • Enhanced system – Add Extensions which increase WCS capabilities • In general, WCS is a repository for watershed data and assessment tools to support TMDL and other environmental programs
TMDL Modeling Toolbox - WCS Characterization Reports Tools Automated reports Maps and Tables Environmental Data
TMDL Modeling Toolbox - WCS Extensions Core watershed data and assessment tools Extensions • Additional Menu functions • Additional Datasets • Additional System files • Supported Models
TMDL Modeling Toolbox - WCS Extensions Models • Sediment tool • Mercury tool • SWMM model GIS interface • NSPM model GIS interface • LSPC model Utilities • NHD download tool • Manual and auto delineation watershed tool • WRDB extension
TMDL Modeling Toolbox - WCS Sediment Tool – Overview • Input • WCS Core + Sediment Tool • Output - Land Use Erosion Maps Sediment Delivery to Assessment Points - Soil Elevation Road Stream BMP Automated Reports (Maps and Tables) - USLE Equation 4 Sediment Delivery Methods Transport Routing Algorithm
TMDL Modeling Toolbox - WCS Sample Results: BMP & Erosion - Little River Watershed K, GA Before, no BMP, erosion = 1032 US tons. Dark orange color indicates high Erosion. After, applying a BMP to row crop areas, P = 0. 65, erosion = 851 US tons, an 18% reduction. BMP area
TMDL Modeling Toolbox - WCS Mercury Tool: Overview Algorithms in the WCS Mercury Extension Land use and USLE parameters Delivery algorithms Local climate, land use, and soil Hydrology algorithms Sediment Yield Calculation Hydrology Calculation Dry + wet deposition Chemistry algorithms Soil Mercury Concentration Mercury Load • Deposition on water and impervious surfaces • Loads from runoff and sediment (pervious surfaces) • Loads from point sources
TMDL Modeling Toolbox - WCS Mercury Tool: Sample Results Mercury Loading in Savannah River Basin
TMDL Modeling Toolbox - WCS SWMM GIS Interface: Overview WCS GIS + VB Interface + SWMM Model = WCS SWMM WCS GIS Interface VB Interface Land use Stream Network Station Rainfall Data PCSWMM Input Text Editor Files. ini Output Visualization SWMM Model (PCSWMM) Rainfall. dat Runoff. dat Transport. dat
TMDL Modeling Toolbox - WCS SWMM GIS Interface: Link to PCSWMM • PCSWMM was developed by Computational Hydraulics International (http: //www. chi. on. ca) • SWMM blocks (modules) are represented by graphic objects.
TMDL Modeling Toolbox - WCS-LSPC GIS Interface: Overview • WCS automatically prepares LSPC database (shapefiles and MS Access tables) for delineated watersheds. • LSPC uses WCS prepared database to generate model input files. WCS (Arc. View GIS) LSPC (Map. Objects and MS Access) One-way
TMDL Modeling Toolbox - WCS Conclusions: • WCS is an extremely versatile framework for environmental databases and models • WCS (and BASINS) can be customized to many different uses beyond just TMDLs
TMDL Modeling Toolbox - WCS How to Obtain WCS and Its Extensions WCS Web Site: http: //wcs. tetratech-ffx. com
TMDL Modeling Toolbox - WCS Web Site
TMDL Modeling Toolbox - WCS Web Site Download WCS Documentation
TMDL Modeling Toolbox - WCS Web Site Download WCS Data by Map or HUC
TMDL Modeling Toolbox - WCS Demonstration of WCS Extensions TN-WCS Extension • Will show individual states can customize WCS (Tennessee Example) • Perform a simple watershed characterization with Tennessee specific datasets WCS to LSPC Extension • Use Flint Creek Watershed (Alabama) as example
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