Planning

Planning

Phase I

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.

Rosedale Phase 1 Study PDF
Rosedale Phase I Study PDF

Phase II

During planning for Phase I, a consultant selected 3 sites for NMRWA which are being used as the large GSI sites. Working with the consultant, NMRWA has developed a more comprehensive strategy for the RRRP area for use in Phase II of the Project. The Phase II Study focuses on corridors, blocks, open spaces, and streets that have high concentrations of stormwater runoff flow. The end result is a map of a network of potential GSI projects or ‘blue corridors’. While NMRWA plans on constructing large GSI facilities along these blue corridors, the locations will also be used for siting stormwater management tree pits.

Community participation was critical in the process of creating this document, and the Study includes input from residents and stakeholders on localized flooding and stormwater issues near their homes and businesses. When we progress into Phase II of the Project this document will serve as the blueprint for our continued efforts to reduce stormwater runoff in the area.

Rosedale Phase II Study PDF
Rosedale Phase II Study PDF