Watershed Characterization System (WCS) and its Modeling Extensions

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Presentation transcript:

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 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

WCS Uses Basic system (core) Enhanced system 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

WCS Characterization Reports Tools Automated reports Maps and Tables Environmental Data

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

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

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

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

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

Mercury Tool: Sample Results Mercury Loading in Savannah River Basin

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

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.

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

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

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

WCS Web Site WCS Web Site

WCS Web Site Download WCS Documentation

WCS Web Site Download WCS Data by Map or HUC

Demonstration of WCS Extensions TN-WCS Extension WCS to LSPC 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