Coe Branch Daylighting

About 700 feet of Coe Branch in Howard E. Herman Stream Valley Park was relocated and enhanced, and about 500 feet was daylighted.

  • Project Plan
  • Estimated Cost: $1,902,434
  • Funding Source: Federal, State and Tribal Assistance Grants and Stormwater Utility Fund

Location


The stream channel known as Coe Branch starts along the south boundary of West Broad Street, adjacent to the Byron, and continues through Howard E. Herman Stream Valley Park until it enters a pipe at the end of Rollins Street. 

Problem


The stream suffered stream bank erosion because of development over 50 years and more. This led to the widening of Coe Branch, a disconnection from the original flood plain, and the destruction of the habitat necessary for diverse aquatic life. Sediment from eroded banks and road grit accumulated in the stream, which further degraded stream habitat conditions.

Frequent flooding occurred in the pipe network downstream of the Rollins Street connection. This condition threatened the homes on Sherrow Avenue. Continued erosion of the stream bank would have eventually undercut the foundations of the homes at Rees Place.

Project Components


  • Natural Stream Channel Restoration techniques were used to relocate and stabilize 700 linear feet of underground stream. What was contained in steel piping was daylighted. 
  • The stream was relocated through the center of the park in its natural floodplain and away from residences, helping with flooding.
  • While 400 trees were removed, about 1,350 native canopy and understory trees and shrubs were planted along the banks to restore and stabilize the habitat.
  • The stream bed was graded and shaped to improve water flow and increase pool habitat. Techniques such as cross vanes, rock toe protection, constructed riffles, and step pools were used to prevent future erosion, control the direction of the flow, and prevent scour of the stream bed while providing habitat for wildlife.
  • The walking path was relocated in order to allow pedestrians to enjoy the enhanced aesthetic value of Coe Branch and Howard E. Herman Stream Valley Park.