What’s the plan?
PWSA, in coordination with City departments and the Pittsburgh Parks Conservancy, will construct a natural stream channel to carry rainwater from Panther Hollow Lake. Today this rainwater flows into the combined sewer system, causing overflows and flooding during wet weather.
This restored stream connection may enable rainwater from Squirrel Hill and Oakland to flow to the Monongahela without entering the combined sewer system.
How is this being designed?
PWSA is working with a team of designers and engineers to gather information about the project site and produce the design.
- Geotechnical surveys provide information about soil structure and groundwater conditions. Drilled soil samples are analyzed in a lab to determine their consistency. This alerts designers to places where slope stability is a concern or where rainwater could be able to soak into the ground.
- Flow monitors throughout the sewershed keep track of how much rainwater flows into key locations of the valley. By strategically placing a few monitors throughout the project area, data can be extrapolated for areas that are not directly monitored.
- Steam Designers will use the geotechnical and flow monitoring data to determine the size of the stream during dry weather, a typical rain event, and a high intensity rain event.
- Stream design includes design of the complete stream ecosystem, including a site-appropriate planting palette and carefully designed floodplains.
- Existing amenities such as the Junction Hollow Trail and Lower Soccer Field may need to be altered in order to accommodate the restored stream. The project team will conduct a design workshop with the public in Early November to discuss this project element.