When Nine Mile Run Watershed Association (NMRWA) developed its 2013-15 Strategic Plan there was one main goal: to reduce the flow of stormwater and sewage into Nine Mile Run. This led to an intense study in 2014 of the watershed to identify priority locations for GSI projects. The RRRP was selected as an area that would quickly have a positive impact on Nine Mile Run.
This 1.15 square mile area is located in the Nine Mile Run sewershed and contributes over 25 million gallons of sewer overflow annually to the stream. The sewer overflows occur at a confluence of pipes located on Rosedale Street, north of the Port Authority’s East Busway Wilkinsburg Station. During dry weather, sewage flows towards the Allegheny River and eventually to ALCOSAN. In wet weather, however, a mixture of stormwater and sewage overflows into a PWSA owned and operated underground outfall structure (1071-OF) that discharges into a large underground culvert carrying a tributary of Nine Mile Run; it then travels 1.5 miles to the emergence of the stream in Frick Park.