In January, we started constructing two stream stabilization projects in Saw Mill Run. These projects are part of the Saw Mill Run Integrated Watershed Management Plan and will help to manage stormwater, reduce erosion, and improve water quality.
Stabilizing the stream uses a combination of solutions that replicate nature and modern engineering techniques. Starting at the base and working along its banks, we can fortify the stream from the bottom up. These improvements will help to protect against future erosion, reduce the amount of sediment from entering the stream, and slow down the velocity of the water during intense storms.
Along the base of the streambank, we have installed a row of stones parallel to the stream. The stones will disperse the energy of the water and protect the streambank from eroding during high flow events.
It is further reinforced with soil stabilization materials applied to the sides of the streambank. These materials, soil matting and a geo-mesh cover, are secured with soil anchors drilled into the side of the bank. The anchors will help to bolster the edge of the stream and will protect the area from further erosion.
This spring, vegetation will be planted. As it adapts and grows, it’s roots will help to improve the stability of the streambank and provide additional environmental benefits. We are also restoring existing storm sewer infrastructure by placing a rocky base, or rip rap, at outfalls located throughout the stream.
Development activity, changing weather patterns, and aging stormwater infrastructure have all contributed to the condition of Saw Mill Run. The integration of green and gray infrastructure provides a more cost-effective way to meet stormwater management and water quality goals within the watershed.
Work is taking place at two locations along Saw Mill Run including the intersection near Saw Mill Run Boulevard and Nobles Lane and Saw Mill Run Boulevard and Maytide Street behind the Accamando Center. We anticipate completing construction this spring.