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Forecasting Benefits for Implementation of LID Practices in Future Developments within the Reedy River Watershed
For this research, a previously developed comprehensive watershed water quality model for the Reedy River as developed by the US Environmental Protection Agency and South Carolina Department of Health and Environmental Control was used to assess the benefits of using LID designs in Greenville County. The original intent of this model was to provide SCDHEC with a defensible model that they then could use to prepare nutrient TMDLs for an area located at Boyd Mill Pond and the Reedy River Arm of Lake Greenwood. This model incorporates two existing models, the US EPA's Loading Simulation Program in C++ (LSPC) and their Water Quality Analysis Simulation Program (WASP). The model was then used to show water quality pollutant loadings and stream flow values over time based on a Greenville County growth study looking at development from 2010 through 2030. Once this analysis was completed, the data gathered along with pollutant removal ratios for total phosphorus based on various low impact design (LID) techniques were used to predict what water quality effects future growth/development have on the watershed from both a traditional engineering design approach compared to that of an LID approach. Results show that significant daily load reductions can be achieved on a county watershed scale based on using LID techniques within future developments.