This project consists of managing the water run-off, settling and infiltration throughout the Wentworth Estates neighborhood, a 1970’s era development of 25 house lots that share 600 feet of common waterfront on approximately 18 acres on the shores of Lake Wentworth located at Red Brook Circle in Wolfeboro, NH. Currently, two culverts discharge stormwater runoff from a gravel road that runs through the neighborhood, sloping down toward the lake. Road and culvert deterioration over the years has increased the non-desirable water runoff that goes directly into Lake Wentworth, allowing high levels of phosphorus and other pollutants and sediments to enter the lake, deteriorating lake quality and safety for all those who use it to recreate. There is a gravel boat ramp that frequently erodes directly into the lake. The Contractor shall propose stormwater Best Management Practices (BMPs) to repair dirt roadways and properly crown the infrastructure for water removal into swales along the sides of the roadway. In addition to the roadway swales, stone check dams, infiltration trenches, and berms will be constructed as required to divert water into existing drainage channels and away from the Wentworth Estates beach area and boat ramp, mitigating pollutants entering Lake Wentworth. The contractor shall also propose ways of stabilizing the boat ramp, including but not limited to geogrid or other pervious reinforcement. Finally, areas will be identified that can support additional native plantings, assisting with natural water infiltration into the landscape, and preventing erosion and sedimentation runoff into Lake Wentworth. The WWA understands this is a proposed approach, and the final design may differ. The result of having these BMPs implemented will be the measured reduction of available phosphorus and other nutrients flowing into Lake Wentworth, helping to prevent a further decline in water quality.
