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Infiltration Retrofit in the Helen Avenue Cul-de-Sac, Design Phase Engineering

The City of South Burlington contracted Stone to advance design of an infiltration practice or practices in the Helen Ave. cul-de-sac as identified in the Potash Brook Flow Restoration Plan (FRP). The project incrementally evaluated infiltration feasibility and, if feasible, progressed designs to the 100% level. The initial phase included investigation of additional potential contributing drainage areas along Helen Avenue, and infiltration feasibility in the cul-de-sac and in upgradient portions of the drainage area. The proposed improvement is consistent with previously developed Potash Brook Flow Restoration Plan (FRP) for the 5.7-acre drainage area, which includes 2.15 acres of impervious surfaces (38% impervious).