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Abstract

This project involves design of a restoration plan for over 5000 feet of degraded streams located in Cedar Hill, Tennessee. The existing streams are highly incised due to agricultural activities and judged to be poorly functioning. Incised streams are typically deep and narrow and disconnected from the adjacent floodplain. Natural streams have features such as riffles and pools as well as a meandering pattern in plan form. These features sustain a diverse aquatic habitat by creating variable hydraulic conditions in the stream. A comprehensive redesign of the streams was performed that included a meandering planform and design of the longitudinal profile and cross section geometry. A hydrologic analysis was completed to determine the range of flow rates expected in the stream. The software package Autodesk Civil 3d was used to generate a design plan set. A hydraulic analysis of the final design was conducted using the model HEC-RAS (Hydrologic Engineering Center – River Analysis System). The hydraulic model was used to refine the design.

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