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Scope
The SWFWMD contracted BCI to concentrate on water quality Best Management Practice (BMP) development for lakes located within the Lake Wales Ridge that were threatened by stormwater non-point source pollution. Lakes included in this work were Menzi, Marie, Gordon, Isis, McCoy, Clay, June-in-Winter, and Tulane. The District had previously inventoried outfalls and made preliminary assessments of stormwater impacts on the lakes.
BCI’s tasks included developing pollutant load estimates for the referenced sub-basins/stormwater outfalls, prioritizing the outfalls based on pollutant loads to the lakes, and developing BMPs to remove stormwater load to the lakes.
BCI used land-use-based Event Mean Concentration pollutant loadings to fairly and cost-effectively prioritize the critical outfalls. Directly connected imperviousness was reviewed carefully due to the preponderance of Type A hydrologic soil group soils and the associated pollutant mass load that is generated from these areas.
Concept BMPs to remove as much nutrient load as possible were drawn schematically in GIS and included such measures as swales, exfiltration trenches, sedimentation inlets and others. These BMPs had to be located in urbanized, scenic areas; therefore, aesthetics and working with the natura surroundings weighed heavily in the recommendation process.
Much of the proposed BMP construction activity is sited in existing governmental lands to help reduce land procurement costs and to allow local municipalities and FDOT to participate in the project. The project is currently moving toward the second phase (design/construction) for several of the lakes.
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