Brentwood Today Stream Stabilization
- Stream Stabilization
- Stormwater Management (Lead)
- HDR Engineering, Inc. of the Carolinas
- Credence Inc.
Posted Wednesday, Dec. 19
Construction for this project is almost complete. Work started upstream to make improvements to the stream channel that runs along Greywood Drive. The stream channel was reshaped and soil was leveled to gradually raise the stream bed to a more natural, functional point while reducing the amount of sediment (sand and gravel) downstream. This project also transforms the energy of the stream and limits future stream erosion.
The last item is to plant vegetation in the stream. The best time to do this is between December and March. The plants will help stabilize the stream banks, prevent erosion from heavy storms, and provide habitat for wildlife. The contractor also will be removing a tree that is down in the project area.
After planting is done, a warranty period will be in place until next fall. Residents are responsible for maintaining their yard as they did prior to the project. The City will be maintaining portions of the stream that were repaired.
Brentwood Today Lake is classified as a small, high-hazard dam with North Carolina Dam Safety and the remaining portion of the dam is no longer working. This resulted in an existing lake bed forming a main stream channel and an area of natural plants downstream of the lake. Due to that change, the channel has weakened significantly and has very steep, unstable channel banks in some areas. The purpose of this project is to stabilize and repair 350 feet of the stream to improve water quality and limit future erosion.
|Winter 2016||Project planning completed|
|Fall 2017||Project design finalized and easement negotiations, permitting, and coordination of private utility relocations complete|
|Winter 2018||Project construction begins|
|Late Fall 2018||Project construction complete (Planting to take place in winter 2019; warranty period ends fall 2019)|
Brentwood Today Lake has a failing spillway, and over the years the concrete spillway sections along the stream have failed and fallen off. The spillway is significantly shorter with only approximately 10 feet of the channel left. A floodplain study of the New Hope Tributary was completed in order to determine the extent of flooding that takes place along the stream. Following the study, the City determined that a stream stabilization would help reduce some of the impacts from the failing infrastructure.