Public Works and Environmental Services Alert:
This project was identified for flood mitigation in the FY 2018 work plan as a result of repeated flooding in the vicinity of Sunset Hills Road near Isaac Newton Square W in Reston. In February 2018, staff of the Stormwater Planning Division initiated the design of the project. Since the original preliminary design, the project focus has transitioned from constructing a large regional pond on Hidden Creek Golf Course to restoring Colvin Run from the W&OD Trail to Wiehle Avenue.
The project area was severely flooded during Tropical Storm Lee. This area does not have overland relief as the W&OD trail embankment is higher than the upstream area of concern. During large storm events, this embankment impounds flows that exceed the capacity of the historic Civil War culvert that is under the W&OD trail. A flood mitigation conceptual analysis was done in February 2016 which provided several options to mitigate flooding. The option selected balances the upstream flooding with the impact on a downstream golf course.
The primary goals of the restoration are:
The project is located at the VDOT park and ride lot near the intersection of Sunset Hills Road and Isaac Newton Square W. This project starts from the VDOT park and ride and runs through the W&OD trail embankment to the downstream farm pond located in the Hidden Creek Country Club Golf Course.
