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Load Estimates, Modeling and Allocations for Bacteria Tmdl Development

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The focus of this study is the development of a TMDL for an existing urban pathogen impairment in the Houston area, with specific attention on the main bayou that drains the city, Buffalo Bayou. Buffalo Bayou is an urban stream that drains much of western Harris County and ultimately empties to Galveston Bay. Bacteria data collected on the stream indicate that it experiences frequent exceedances of the contact recreation standard. Frequent rains that trigger runoff events and the lack of distinct seasons are complicating factors thought to be contributing to the problem. Sources of bacteria in the watershed include wastewater treatment plants, sanitary sewer overflows, dry and wet weather discharges through the municipal separate storm sewer system, septic systems, sediment resuspension, direct deposition from animals and upstream sources. This paper develops two separate modeling approaches and discusses the model set-up and results.
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Keywords: BACTERIA; HSPF; NONPOINT SOURCE; POINT SOURCES; RUNOFF

Document Type: Research Article

Publication date: 2007-10-01

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