Retrofit and upgrade of an existing dry pond stormwater basin to improve water quality. Retrofits enable the basin to hold back water and allow it to soak into the ground, minimizing runoff and flooding issues. It also filters the water, keeping harmful pollutants out of the creek. This basin is the collection point for a large suburban residential area. The site hosts an 18,000 sq/ft upper basin and a 21,500 sq/ft lower basin which includes a 240 foot flow channel. A natural berm in the upper basin located just below the inlet to disperse rain water as it enters the basin. Natural wetlands were allowed to grow and the level of the upper basin outlet structure was raised 3”.
Three check dams were installed in the connecting channel to slow the water moving through the system, allowing time for groundwater recharge. Changes to the lower basin include water flow deflectors and re-graded banks. Over 150 native trees and shrubs ad 400 plugs were planted throughout the entire project site and warm season grasses line the perimeter of the project site.
County: Montgomery County
Watershed: Wissahickon Creek
Upper Dublin: http://www.upperdublin.net/
Tree Vitalize: http://www.treevitalize.net
Pennsylvania Environmental Council: http://www.pecpa.org/
Philadelphia Water Department (for design): http://www.phillywatersheds.org/
Upper Dublin Township
801 Loch Alsh Avenue, Fort Washington, PA 19034