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Engineers asked for more calculations after proposal would increase wetland watershed from 2.8 to 4.4 acres
Summary
A revised South Grand Street subdivision plan would increase contributing watershed to a wetlands area from about 2.8 to 4.4 acres via roof leaders, rain gardens, and swales; the Commission requested additional drainage calculations and analysis to confirm the proposed system would not worsen flooding or erosion.
The Commission reviewed a revised subdivision proposal on South Grand Street that would increase the contributing watershed to a nearby wetland from approximately 2.8 acres to 4.4 acres by using roof leaders, rain gardens, and swales. Commissioners expressed significant concern that the additional flow could increase flooding, erosion, and impacts to adjacent properties and existing road drainage.
The project's engineer said existing drainage systems and berms should maintain appropriate water levels despite the increased flow. Commissioners nonetheless requested additional calculations to confirm the proposal would not worsen current flooding or create new impacts. The engineer agreed to provide the requested calculations and to evaluate potential flooding, increased water flow, and wetland impacts before the Commission takes further action.
