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Brentwood Today Stream Stabilization

Last updated Nov. 07, 2018 - 1:41 pm
  • Planning
  • Design
  • Construction
  • Completed
  • Stream Stabilization
  • $850,000
  • Stormwater Management (Lead)
  • HDR Engineering, Inc. of the Carolinas
  • Credence Inc.

Current Activity

Posted Wednesday, Nov. 7

Construction for this project is nearly complete. Work started upstream to make necessary improvements to the stream channel that runs along Greywood Drive. For this repair, the stream channel was reshaped and soil in the stream 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 contractor is working on final construction items before the project is complete, including planting and growing grass in affected areas, adjusting the erosion control matting along the stream banks, repairing one of the step-like soil lifts, installing fencing, and completing minor stream bank repairs. Planting along the stream channel will take place this winter. The vegetation will begin to grow in warmer months.

Summary

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.

Images

  • Brentwood Today Stream - Nov. 2018
  • Brentwood Today Complete
  • Brentwood Today - Under Construction
  • Brentwood Today Stream
  • Brentwood Project Area

Schedule

Project schedule with dates and descriptions
DateDescription
Winter 2016Project planning completed
Fall 2017Project design finalized and easement negotiations, permitting, and coordination of private utility relocations complete
Winter 2018Project construction begins
Fall 2018Project construction complete (Planting to take place in winter 2019; warranty period ends Fall 2019)

History

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.

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