Rabbit Branch Tributary Restoration Project at Collingham Drive
Project Update: October 12, 2022
Construction in progress and scheduled to finish November 2023.
This project was identified in the Pohick Creek Watershed Management Plan for stream restoration and stabilization. It was placed in the county's Fiscal Year 2017 work plan as a result of maintenance issues related to Lake Royal.
The project will restore more than 4,800 linear feet of natural channel and about 1,300 linear feet of outfall leading to it. The stream channel exhibits eroded and over-widened banks, head-cuts, and the potential for further bed and bank instability. Restoration objectives include stream stabilization, water quality improvement, aquatic and riparian habitat enhancement and reconnection of the channel to its floodplain. This project is part of larger efforts to restore many of Fairfax County’s degraded streams while improving overall water quality and the condition of the Chesapeake Bay.
The primary goals of the restoration are:
Stabilize the channel and prevent future erosion and degradation along the stream
Reconnect the channel to its floodplain
Restore native trees and herbaceous planting to promote natural reforestation
Develop a healthy ecosystem
The project in the Pohick Stream Valley Park, upstream of Lake Royal, on Fairfax County Park Authority property.
Project is in construction.
The benefits of the project are:
Improve sewer system reliability in the neighborhood.
Prevent costly future emergency repairs.
Reduce future risk of sanitary sewer overflows.
Reduce risks to public health and the environment.
Fairfax Recovery Wheel
Ahead of a stream restoration project it is important to gain a holistic assessment of the stream’s health, as well as to ascertain its restoration potential and function, and to observe how the community engages with the body of water. All of this aids in understanding how ecosystem services can be improved during the restoration project.
At Rabbit Branch Tributary Restoration Project at Collingham Drive, we have made a full assessment in preparation for completing the design/moving towards construction.
The Fairfax Recovery Wheel tool helps us understand a stream corridor. Metrics include social, biological, geomorphological and construction feasibility aspects. Overall, we need to know how 24 different metrics of stream corridor health balance in this system.
Construction began in Spring 2022 and is expected to be substantially completed in early winter 2023.
What to Expect
The construction area will be fenced with orange snow fence, metal tree protection fence and/or silt control fencing. Inside the construction area will be closed to residents. Staff and contractors will wear high-visibility clothing, and proper safety gear. Once construction begins, access and deliveries will enter the site from one of the proposed access points at Roberts Road and/or Gainsborough Dr. The typical work week is Monday through Friday starting after 7 a.m. Note that at some periods during construction, work may occur on weekends. Construction activities on weekends will begin after 9 a.m. These start times are in accordance with the Fairfax County Noise Ordinance.
Project Cost and Funding Source
Construction of the Rabbit Branch Tributary at Collingham Drive is estimated at $2,797,000. .