millbrook park stream

Water and Sewer

Millbrook Exchange Park Stream Restoration

The purpose of this project is to restore a stream near Perry Creek to improve its function and provide a better habitat for the aquatic life and plants located in the stream.

Project Details

 
Type:
Lakes, Streams, and Dams
Budget:
$300,000
Contractors:
NCSU Stream Restoration Program

Contact

 

Heather Dutra
Senior Engineer
919-996-4012

Lead Department:
Engineering Services
Service Unit:
Stormwater

Planning

This phase is complete.

Phase Contacts

 

Heather Dutra
Senior Engineer
919-996-4012

Lead Department:
Engineering Services

Design

This phase is complete.

Phase Contacts

 

Heather Dutra
Senior Engineer
919-996-4012

Lead Department:
Engineering Services

Construction

This phase is complete.

Phase Contacts

 

Heather Dutra
Senior Engineer
919-996-4012

Lead Department:
Engineering Services

Complete

Posted Tuesday, June 18

This project is complete. We installed 11 stone dams and a vertical control structure to prevent streambank erosion. We also planted trees and shrubs in the project area. 

North Carolina State University will continue to study the stream over the next year to track the benefits of using this innovative stream restoration technique.

Phase Contacts

 

Heather Dutra
Senior Engineer
919-996-4012

Lead Department:
Engineering Services

History

This unnamed stream flows to Perry Creek and passes through Millbrook Exchange Park. It receives stormwater runoff from a 167-acre largely developed drainage area.  As a result of erosion caused by stormwater runoff coming from the surrounding area, this stream’s bed has dropped several feet below its natural level, and the stream channel now is between 5-12 feet with vertical banks. This means the stream is lacking many key functions that preserve it and protect wildlife in the area. With the design, the stream bed will go from 12 feet deep to 3 feet deep (in some places along the stream). 

This stream is also unique because it only fills up with water during rainy seasons or heavy rain storms. For this reason, it may take several years for the stream bed to be completely repaired. 

Millbrook Stream - Complete
Stream in Millbrook Exchange Park (Before Construction)
Stream in Millbrook Exchange Park (Before Construction)

Schedule

Date Activity
Spring 2018 Project design and permitting/bid process complete
Fall 2018 Project construction begins
Spring 2019 Project construction complete (Monitoring will continue through 2020)

The Restoration

The restoration will use a low-cost and unique design that includes fitting 11 small stone dams in the stream that will fill in with sediment (i.e. silt, sand, and gravel) over time and raise the stream bed. This restoration technique will reduce the amount of sediment downstream, transform the energy and flow of the stream, and prevent any further erosion to the stream bank. 

The project is being supported through grant funding provided by the Clean Water Management Trust Fund.