Raleigh Stormwater and NC State University to Restore Stream in Millbrook Exchange Park with Innovative Design

News posted Feb. 05, 2018 - 5:15 pm

The City of Raleigh's Stormwater Management Division will hold a public meeting on Feb. 8 to provide an update to residents on the Millbrook Exchange Park Stream Restoration.

During the meeting, the City and North Carolina State University's Stream Restoration Program will share design plans for this project that will make improvements to a stream in Millbrook Exchange Park near Perry Creek. This stream is severely eroded and as a result, it has very tall (five to 12 feet) and unstable stream banks. The erosion has negatively affected the natural function of the stream and the wildlife surrounding the stream. The meeting will take place at 6:30 p.m. at the Millbrook Exchange Park Community Center, 1905 Spring Forest Road.

The restoration uses a low-cost and unique design that includes installing 11 small dams in the stream channel that will capture sediment (sand and gravel) over time in order to raise the stream bed by five feet. This restoration technique will reduce the amount of sediment washed downstream, transform the energy and flow of the stream, and prevent further erosion to the streambanks.

N.C. State's Stream Restoration Program is designing and monitoring the restoration. After the small dams are built and the first large rain storms occur, N.C. State engineers will determine if the design needs to be adjusted before completing construction. Engineers estimate that it will take approximately three to five years for the stream, which only traps sediment during heavy rain storms, to return to its natural state and for the dams to be completely filled in and covered.

This project is supported by grant funding from the Clean Water Management Trust Fund. Construction is expected to be complete in the fall.

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