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Watershed Characterization System (WCS) and its Modeling Extensions

Watershed Characterization System (WCS) and its Modeling Extensions. Brian Watson Tetra Tech Inc. What Is WCS?. Customization and enhancement of EPA BASINS for EPA Region 4 Uses ESRI ArcView-GIS 3.x as a platform Desktop system Automated characterization report using spatial databases

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Watershed Characterization System (WCS) and its Modeling Extensions

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  1. Watershed Characterization System (WCS) and its Modeling Extensions Brian Watson Tetra Tech Inc.

  2. What Is WCS? • Customization and enhancement of EPA BASINS for EPA Region 4 • Uses ESRI ArcView-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 supportPLOAD and SWAT

  3. 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

  4. WCS Characterization Reports Tools Automated reports Maps and Tables Environmental Data

  5. WCS Extensions Core watershed data and assessment tools Extensions • Additional Menu functions • Additional Datasets • Additional System files • Supported Models

  6. 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

  7. Land Use Soil Elevation Road Stream BMP Sediment Tool – Overview • Input • WCS Core + Sediment Tool • Output • Erosion Maps • Sediment Delivery Maps • Sediment Delivery to Assessment Points • Automated Reports (Maps and Tables) USLE Equation 4 Sediment Delivery Methods Transport Routing Algorithm

  8. 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

  9. Land use and USLE Local climate, Dry + wet parameters land use, and soil deposition Delivery Hydrology Chemistry algorithms algorithms algorithms Sediment Yield Hydrology Soil Mercury Calculation Calculation Concentration Mercury Load • Deposition on water and impervious surfaces • Loads from runoff and sediment (pervious surfaces) • Loads from point sources Mercury Tool: Overview Algorithms in the WCS Mercury Extension

  10. Mercury Tool: Sample Results Mercury Loading in Savannah River Basin

  11. WCS GIS Interface VB Interface Land use Stream Network Station Rainfall Data PCSWMM Input Text Editor Files.ini SWMM Model (PCSWMM) Rainfall.dat Output Visualization Runoff.dat Transport.dat SWMM GIS Interface: Overview WCS GIS + VB Interface + SWMM Model = WCS SWMM

  12. PCSWMM was developed by Computational Hydraulics International (http://www.chi.on.ca) • SWMM blocks (modules) are represented by graphic objects. SWMM GIS Interface: Link to PCSWMM

  13. WCS (ArcView GIS) LSPC (MapObjects and MS Access) One-way 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.

  14. 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

  15. How to Obtain WCS and Its Extensions WCS Web Site:http://wcs.tetratech-ffx.com

  16. WCS Web Site WCS Web Site

  17. WCS Web Site Download WCS Documentation

  18. WCS Web Site Download WCS Data by Map or HUC

  19. Demonstration of WCS Extensions • TN-WCS Extension • Will show how 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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