Stormwater Symposium

Oral

395297 - Design Guidance and Performance of Highway Construction Sediment Basins in Tennessee

Tuesday, June 5
4:00 PM - 5:30 PM
Location: Greenway AB

Regulations set in place by the US Environmental Protection Agency and Tennessee Department of Environment and Conservation require performance standards that often affect existing design criteria for current stormwater control measures. Specifically, resulting in the Tennessee Department of Transportation’s (TDOT) need for a revised engineering design criteria for sediment basins at highway construction sites. The nature of highway sites being corridor-like in shape and often having fully exposed and highly trafficked soil reflects the need to assess whether current design criteria are adequate to meet the state’s performance standards. Therefore, discharge and sediment flux monitoring of the influent and effluent at three construction sites in Tennessee were selected with varying land slopes, soil types, and drainage areas. This aligns with a modeling effort for site sediment yields estimates and basin sizing as a function of these three key site conditions. Through engineering assessment, the monitoring devices used at each site were specially chosen for the constraints of the individual location; at each location the following were collected for ten storms: inlet and outlet water samples, soil samples from flume deposits, full weather data, and volumetric flow data. The resulting particle size analysis and suspended sediment concentration data were used to calibrate the hydraulic and basin sediment settling models in order to verify sediment basin performance based on current design guidance. This performance data ensures that TDOT has a functioning and usable design for various sized sediment basins, minimizing cost and inconvenience, ensuring their use when the best possible stormwater practice.

Payton Smith

Graduate Student
University of Tennessee, Knoxville

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Ali Hangul, PE

Assistant Director, Roadway Design and Office of Aerial Surveys Division
Tennessee Department of Transportation

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