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Wilmington College -------------------------------------------------------------------------------- Due to limited land area and Water Resource Protection Area (RPA) restrictions, Wilmington College faced the possibility of being unable to construct new on-campus library and office buildings. Because the College lies within an area designated as an RPA overlay zone, development in excess of 20% impervious coverage (pavement and roof area) is classified as a conditional use. This classification requires maintenance of post- development groundwater recharge (quantity and quality) at pre-development levels. A typical solution to this problem requires low-density development or some form of land-consuming recharge pumps. As an urban campus, the college had no land to utilize for this purpose. In order to develop their site and meet RPA guidelines, Wilmington College retained Duffield Associates. The challenge facing the Duffield team of engineers and hydrogeologists was to obtain and manage the quality of recharge without adversely affecting campus activities and aesthetics. We determined that rooftop collection of stormwater would meet the recharge quantity and quality requirements, and designed a subsurface infiltration gallery to accommodate the space limitations. Our design received Honors in the Consulting Engineers Council of Delaware's Engineering Excellence Design Competition. Duffield Associates is providing ongoing operations review and monitoring in accordance with the requirements of a Water Management Agreement negotiated with New Castle County. |
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Georgetown,
DE
Philadelphia, PA Carlisle,
PA Stone
Harbor, NJ North
East , MD