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Watershed Characterization System (WCS) and its Modeling Extensions

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Presentation on theme: "Watershed Characterization System (WCS) and its Modeling Extensions"— Presentation transcript:

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 support PLOAD and SWAT

3 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

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 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

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 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

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

11 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

12 SWMM GIS Interface: Link to PCSWMM
PCSWMM was developed by Computational Hydraulics International ( SWMM blocks (modules) are represented by graphic objects.

13 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)

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:

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 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

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