Taylorsville Lake Water Quality Modeling Study
Taylorsville, Kentucky
Taylorsville Lake, KY, is operated and managed by the Louisville District, COE, to provide flood control, water supply, and fish and wildlife enhancement. The reservoir is listed by the State of Kentucky as a high priority project on its 303(d) list. The reservoir is not meeting its fishery use as a result of high nutrient inputs from nonpoint sources in the watershed near the reservoir. Listing on the 303(d) list required that a Total Maximum Daily Load (TMDL) study be conducted.FTN calibrated and confirmed the two-dimensional water quality model CE-QUAL-W2 on Taylorsville Lake to evaluate various levels of nutrient input reduction. FTN developed a method to determine a phosphorus TMDL for Taylorsville Lake for the Kentucky DNR Division of Water. This method was approved by both EPA and the Kentucky DNR Division of Water. FTN partitioned the total phosphorus load into background, point, and nonpoint source contributions. Various nutrient reduction scenarios were simulated to evaluate changes in 3 reservoir assessment endpoints--dissolved phosphorus concentrations, transparency, and chlorophyll concentrations. A 50% nonpoint source nutrient reduction scenario was recommended as the preferred alternatives. The results of that evaluation were used to set goals for a program of BMP implementation.
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