Manor Township Detention Basin Retrofit

As an MS4 Permittee, Manor Township is required to reduce stormwater pollutants to maintain compliance with their MS4 Permit requirements and to improve water quality in local streams and the Chesapeake Bay. The Township owns six dry detention basins that will provide significant pollutant reductions after being retrofitted into bioretention basins. Two of the existing basins – the Monticello Lane Basin and the Williamsburg Road Basin – had not been maintained and were overgrown with mature trees, shrubs, and invasive weeds.

The Township relied on RETTEW for our technical expertise in MS4 and stormwater management to design the basin retrofits and vegetated bioswale. We also provided guidance to the Township’s Public Works staff during construction of the projects. By using their own Public Works staff to install and construct the proposed projects, the Township saved well over $150,000. These three projects resulted in sediment reductions of 29,281 pounds/year, phosphorus reductions of 34 pounds/year, and nitrogen reductions of 1,213 pounds/year.


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