Using GIS to Aid in TMDL Modeling

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Presentation transcript:

Using GIS to Aid in TMDL Modeling Term Project Presentation CE394K GIS in Water Resources November 30, 2000 Tony Sarman

Objective To understand the Total Maximum Daily Load (TMDL) process To see what abilities GIS has to aid in the development of TMDLs

Background Clean Water Act section 303(d) Identification and rank waters with insufficient controls Set TMDL Implementation of the control measures Effluent Limits Best Management Practices (BMP)

Background TMDL - “maximum amount of a pollutant that a water body can receive and still meet water quality standards.” LC = WLA + LA + MOS

Basins 3.0 Better Assessment Science Integrating Point and Nonpoint Sources (BASINS) Directly integrated within an ArcView GIS environment Modeling Tools QUAL2E Soil and Water Assessment Tool (SWAT) Generation and analysis of model simulation (GenScn)

QUAL2E One-dimensional, steady-state water quality model Able to give concentrations along the length of a river Predominantly point source

SWAT Simulates hydrology, pesticide and nutrient cycling, bacteria transport, erosion, and sediment transport Predict effects of land use management Daily time step

GenScn Replaced NPSM Create, analyze, and compare simulation scenarios Simulate the hydrologic and associated water quality processes on pervious and impervious land surfaces and in streams and well-mixed impoundments

Summary Still working with the program Fixed problems since v. 2.0 Raster Data – Require Spatial Analyst May be possible to model lakes, bays, estuaries Snow melt algorithm (degree-day)