Visitors Center Rain Garden


This project will design and construct a demonstration rain garden at the Visitors Center at Round Hill Park to capture and treat rainwater from the building’s roof and to serve as an educational opportunity for park visitors to learn about stormwater management. The use of “green infrastructure” to manage stormwater runoff was a significant recommendation made in the Ecological Assessment and Action Plan for Round Hill Park. Rain gardens are a tool in the green infrastructure toolbox.

New piping will be installed to direct rainwater from the roof of the building, totaling approximately 2,500 square feet, to a rain garden on the south side of the building. The project will be designed to manage a minimum of the first inch of rainfall from storms totaling approximately 1,600 gallons. Allegheny County receives on average 39 inches of rain annually, so the rain garden could capture and treat up to 62,400 gallons of rain, depending on the severity of the storm and the amount of rainfall. The rain garden project will include erosion control, excavation, piping, engineered soils with an underdrain, decorative stone, native species plantings and mulch.

Rain gardens help to mitigate runoff from impervious surfaces in many ways. They provide an opportunity for rainwater to infiltrate into soil instead of flowing straight into streams which can help reduce downstream flooding. They allow pollutants to settle out of runoff, and plants help to filter out chemicals which keeps streams clean and clear. Interpretive signage will also be installed at the Visitors Center to educate park users on these environmental merits of treating stormwater runoff.


This project is currently in the design phase. Work is expected to be completed in 2023.


Allegheny County


    • Allegheny County
    • EQT Foundation