Jones Edmunds designed, permitted, and monitored two stormwater management facilities to address flooding and water quality concerns in the Whispering Pines Basin in Leesburg. Jones Edmunds began by conducting a project development and evaluation study for the City. The two highest-ranked projects from the study – the Canal Street Pond and the Lee Street Pond – were then designed and constructed to help meet TMDL pollutant-load-reduction goals and address a flooding problem area.
The first project is the Canal Street pond, which consists of a 2-acre wet detention pond on City-owned property along with several reaches of storm sewer to direct flows to the pond. The pond provides retrofit treatment of a portion of the downtown area and was also sized to accommodate redevelopment and densification in the downtown area.
The Lee Street stormwater treatment facility consists of a 2-acre wet detention pond followed by a 2-acre treatment wetland. The treatment wetland takes advantage of onsite wetlands that were in need of restoration. The wet detention pond/treatment wetland system should maximize phosphorus removal-the pollutant of concern in the TMDL-while maximizing the benefit to existing onsite wetlands. Jones Edmunds designed a diversion structure and bypass channel to prevent excessively high flows from entering the pond and re-suspending settled pollutants. Both treatment facilities were designed to be natural looking by curving the edges and varying the side slopes. Jones Edmunds also incorporated other park features into the Lee Street site and developed public education kiosks for both sites.
Jones Edmunds helped the City obtain grant funding from the Lake County Water Authority and the Florida Department of Environmental Protection’s TMDL grant-funding program. The grants covered most of the project costs. Jones Edmunds also provided post-construction monitoring of the Lee Street pond as part of the grant-funding requirements. Monitoring results demonstrated a phosphorus removal efficiency of approximately 85%.
This project demonstrates our ability to combine practical design solutions while still providing cost-effective ways to address water quality. It also is a good example of how stormwater design can blend into communities and improve the quality of life.