The City of South Burlington Stormwater Utility received a grant from the Vermont Agency of Transportation to install an underground Stormwater infiltration practice in the footprint of Picard Circle. The project included the design and construction of a stormwater infiltration basin within the City right-of-way (ROW) and drainage infrastructure to allow for the treatment of stormwater runoff form 15 acres of impervious surfaces.
Previously untreated stormwater runoff generated from a 66 acre drainage area, including 21 acres of impervious surface, discharged directly to the impaired Centennial Brook near the intersection of Airport Parkway and Picard Circle. This project was identified as part of the Centennial Brook Flow Restoration Plan (FRP), prepared by the City of South Burlington, in an effort to reduce flows to the impaired Centennial Brook and improve water quality in the Lake Champlain drainage area.
The project reduces the peak flow of the 1-year, 24-hour storm event by 87%, from 9.09 cubic feet per second (cfs) to 0.38 cfs and infiltrates the water quality volume from 21 acres of impervious surfaces, reducing the amount of phosphorous going to Lake Champlain by 33 kg per year.
This project received funding from the Transportation Alternatives Grant Program administered by VTrans. The remaining project costs were paid using stormwater utility capital project funding.
Page last updated: 8/27/2019