Bacteria Loadings Watershed Model:

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Presentation transcript:

Bacteria Loadings Watershed Model: Copano Bay Copano Bay Presenter: Carrie Gibson CE 394K.3 GIS in Water Resources University of Texas at Austin, Fall Semester 2004 Instructor: David R. Maidment

Background Section 303(d) of 1972 Clean Water Act Texas Commission of Environmental Quality (TCEQ) Texas Surface Water Quality Standards Fecal coliform bacteria Oyster water use Contact Recreation Use Enterococci Mission River Aransas River Copano Bay Impaired Water Segments

Project Overview Identify major bacterial sources in Copano watershed. Calculate total bacteria loadings, Total Maximum Daily Loads (TMDLs), from bacterial sources. Determine amount of load reductions that is needed to meet water quality standards.

Objective of Term Project Complete first phase for Copano Bay TMDL project Compile Geographic Information Systems (GIS) data layers for watershed GIS data TCEQ and Texas Department of Health (TDH) bacteria monitoring data Land use land cover data Event mean concentrations (EMCs) Precipitation data Digital elevation models

TCEQ Bacteria Monitoring Data Fecal Coliform > 200 MPN/100mL Bacteria Monitoring Stations

TCEQ Bacteria Monitoring Data Enterococci > 35 MPN/100mL Bacteria Monitoring Stations

Non-Point Sources

National Land Cover Dataset Land Use Classifications Event Mean Concentrations Load (Mass/Time) = Flow (Volume/Time) * Concentration (Mass/Volume) Flow Accumulation

National Elevation Dataset Terrain Preprocessing Watershed Delineation WRAP Hydro LEGEND Bacteria Monitoring Stations Water Segment Points Value High : 162.8 Low : -2.2

Point Sources

Texas Colonial Waterbird Census Texas Department of Health BASINS Permit Compliance System Texas Colonial Waterbird Census Texas Department of Health Septic Tanks (malfunctioning) Wastewater Treatment Plants Agriculture Waste NPDES Facilities Colonial Waterbird Pairs

Tasks to be Completed Create runoff grid from precipitation Find bacteria loadings (EMCs) associated with different land use classifications Use WRAP Hydro to delineate watersheds

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