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 3 has been selected for both expansion and retrofit to a subsurface gravel wetland.
Pond 3 currently manages approximately 2.86 acres of Kennedy Drive impervious area and was originally designed to meet the WQv and overbank protection design standards. However, the existing pond was only
designed to treat the additional impervious acreage associated with the Kennedy Drive road expansion, thereby not meeting the treatment standards for the entire contributing drainage area.
Additionally, there is currently untreated stormwater runoff generated from a 4.26 acre drainage area that bypasses the pond by way of a culvert that passes under Pond 3’s access drive. This project proposes to capture this additional area, as well as expand and retrofit the pond into a subsurface gravel wetland to provide Water Quality and Channel Protection treatment for the existing and expanded 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 50%, from 2.75 cubic feet per second (cfs) to 1.37 cfs.
Construction is currently scheduled for 2019.
This page was last updated on 3/12/18