Swann Street Drainage Improvements Phase I

Last updated Dec. 18, 2017 - 1:04 pm
  • Planning
  • Design
  • Construction
  • Completed
  • Storm Drainage System
  • $1.5 million
  • Stormwater Management (Lead)
  • WK Dickson

Current Activity

Posted Monday, Dec. 18

Necessary permits for this project have been received. Design plans were finalized and reviewed by the City's Development Services Department in September. The project is expected to be bid for construction in January 2018.


The primary project goals are to eliminate roadway flooding in the 10-year flood event and to minimize any flooding to insurable structures within the project area. 


Phase I design plans are intended to make proposed drainage improvements while ensuring that erosion in this area does not get worse. Bank stabilization to minimize erosion and property loss will be addressed in Phase II of this project. Proposed solutions include using several boulder cross vanes to reduce the slope and velocities of the stream channel and adding a large concrete vault with a four foot drop to help reduce the strength of storm flows.


  • Swann Street Flooding
  • Swann Street Overflow
  • Swann Street Drainage


Project schedule with dates and descriptions
Fall 201670% design plans and finalized easement plans completed
Spring 201790% design plans completed
Summer 2017Drainage easements and environmental permit process complete
Fall 2017Project design complete
Winter 2018Project bid complete
Spring 2018Project construction begins
Fall 2018Project construction complete


The Stormwater Management Division completed a drainage basin study in 2013 for the Swann Street area. Recommendations were provided to reduce the frequency of flooding, roadway and driveway overtopping, and complete bank erosion stabilization. Raleigh City Council approved the design phase of the Swann Street Drainage Improvement Project – Phase I in July 2015. This project will be divided into two phases with Phase I focusing on the downstream improvements and Phase II on the upstream improvements.

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