Impact of Shoreline Septic Systems on Water Quality of Lake Lanier

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Presentation transcript:

Impact of Shoreline Septic Systems on Water Quality of Lake Lanier Matthew Thibodeaux Samuele Ceolin Dr. David Radcliffe

North GA Watersheds

Lake Lanier

Policy Lake Lanier has a TMDL for chlorophyll-a that requires a reduction in Nitrogen & Phosphorous inputs to still meet water quality standards. Requires reduction of 3% & 24%, respectively Source: GA EPD December 2017 Project involves working on behalf of Gwinnett County to develop an estimate of shoreline septic system & surficial runoff impacts on nutrient levels in Lanier

Septic System Source: L. Crighton, Grit, March 2011

Project Source: Gwinnett Co. DWR

Site 1

Additional Field Installations Source: Professional Gutter & Drain Source: Gwinnett Co. DWR

Preliminary Results Site 1

Preliminary Results Site 1

Preliminary Results Site 1

Future Directions Install monitoring equipment at 10+ sites on Lanier and collect samples for at least a year. Compare groundwater and runoff nutrient levels to nutrient concentrations in lake. Develop a model to predict nutrient inputs with a multitude of differently weighted variables in an effort to inform future water quality decisions.