There are a series of seven stormwater ponds that manage runoff generated by Kennedy Drive. The City is working with an engineer to design improvements to these ponds, so that they can treat additional runoff that currently bypasses the ponds untreated, as well as upgrading select ponds to subsurface gravel wetlands to enhance the phosphorous removal of the treatment system. Kennedy Drive Pond 2 has been selected for both expansion and retrofit to a subsurface gravel wetland.
Pond 2 is located at the southwest corner of the intersection of Kennedy Drive and West Twin Oaks Terrace. This pond currently manages runoff from approximately 3.5 acres, including a portion of impervious surface from West Twin Oaks Terrace, Twin Oaks Terrace, Grandview Drive, as well as portions of parking lots and rooftops. However, the existing pond was only designed to treat a smaller impervious acreage, thereby not meeting the treatment standards for the entire contributing drainage area.
This project proposes to expand and retrofit the pond into a subsurface gravel wetland to provide Water Quality and Channel Protection treatment for the existing drainage area.
This project was identified as part of the Potash Brook Flow Restoration Plan (FRP), prepared by the City of South Burlington, in an effort to reduce flows to the impaired Potash Brook and improve water quality in the Lake Champlain drainage area.
Based on HydroCAD modeling conducted by the consultant, the project could reduce the peak flow of the 1-year, 24-hour storm event by 90%, from 2.75 cubic feet per second (cfs) to 0.23 cfs.
The City has received grant funding from the Vermont Agency of Transportation (VTrans) for the final engineering design and construction of the upgrades to Kennedy Drive Pond 2. Construction is currently anticipated for 2021.
This page was last updated on 12/17/20