Stream/Culvert System Analysis – Spruce Street Watershed

Client: City of Fayetteville, NC

Spruce Street Watershed

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Services provided in this project:

 

In Fayetteville, NC, the un-named stream reach extending from Spruce Street to the confluence with Little Cross Creek has experienced persistent flooding problems for many years. In 2005, a significant storm event caused flooding in which a local teenager drowned. JEWELL Engineering was contracted to analyze the watershed hydrology and stream reach hydraulics extending from Spruce Street to the system outlet downstream of Forest Hills Drive to determine a comprehensive solution to flooding problems.

The watershed covers 142 acres and the stream reach length is about 1,400 feet with a culvert under each of four streets and a piped system connecting the crossings between two streets. Hydrologic and hydraulic analyses of the watershed were performed using HEC-HMS, HEC-RAS, HY-8, and HydraFlow. The varied configuration of the stream/culvert reach required an innovative approach to analysis to account for flows and water surface profiles as the stream passes through various culvert and open channel configurations. The hydraulic analysis enabled JEWELL to identify a set of system upgrades that will reduce flooding and allow the system to perform within City of Fayetteville standards. An overall site plan drawing was prepared to show the proposed upgrades, along with a conceptual cost estimate for use in the City’s budget projections.