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Bristol Town Beach Stormwater Outfall Retrofit
Bristol, RI

Pare Corporation was retained by the Town of Bristol, RI to provide a solution for frequent closing of the Town Beach due to stormwater discharges containing harmful bacteria and other pollutants.  Pare analyzed the
100-acre watershed, evaluated alternatives, and designed and permitted Rhode Island’s first Gravel Wet Vegetated Treatment System (GWVTS). 

The GWVTS incorporates two vegetated permanent pools that temporarily store stormwater runoff from the adjacent residential neighborhoods and treat for pathogens, total suspended solids, and other constituents. A sediment forebay first removes trash, litter, and sediment from the incoming runoff through settling. Overflow from the sediment forebay enters two GWVTS cells constructed with a 2-foot-deep crushed stone base set on an impermeable liner. The crushed-stone cells support pathogen-consuming bacteria, which clean the stormwater prior to release. Runoff is directed through the crushed stone via infiltration and an underground pipe network. The surface of the two cells are planted with a variety of aesthetically pleasing flowers and shrubs that also function as filters. An outlet control structure regulates the water level and flow of filtered, treated stormwater to the bay.

The GWVTS is capable of treating approximately 300,000 gallons of stormwater runoff from the upstream watershed area during storm events.