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DEP cites rain gardens, infiltration basins and sidewalk BMPs as cost‑effective options
Summary
DEP presented local examples of BMPs—rain gardens, infiltration basins and micro‑scale sidewalk BMPs—giving cost and performance figures to help applicants size and budget projects.
The presenter ran through several concrete BMP examples and cost benchmarks to help applicants develop realistic budgets and pollutant‑reduction estimates.
A simple rain garden in a parking lot was described as a low‑complexity, effective option. The presenter gave a Lexington catch basin example that treats about 25 acres and “is removing approximately 36 pounds of phosphorus per year before going into reservoir pond.” The presenter said one Leominster project cost roughly $300,000 in grant funds with $600,000 in matching funds; an infiltration system in Stoughton that treats about 20 acres cost about $150,000. For small, distributed installations the presenter highlighted work by the Mystic River Watershed Association: “they cost about 14,000 each,” and installing many small units can yield a significant cumulative reduction in runoff and phosphorus.
