Stormwater Symposium

Oral

395321 - Channel Protection Best Practices – Coupling Stormwater Hydrology, Stream Hydraulics, and Channel Evolution Geomorphology

Thursday, June 7
10:30 AM - 12:00 PM
Location: Greenway AB

Channel protection efforts are intended to mitigate the impacts of siltation and habitat destruction resulting from urban hydromodification. Although some success has been achieved, scenarios still occur where current mitigating efforts do little to avoid effects, often attributed to current command and control style regulation lacking an integrated systems approach. More specifically, few agencies mandate incorporating channel protection guidance and siltation TMDL implementation plans with geomorphic attributes of the streams they are intended to protect. The purpose of this presentation is to demonstrate a unique approach to linking hillslope and channel processes for the purposes of evaluating efforts to mitigate channel degradation in urban stream reaches. Topographic surveys in combination with in-situ monitoring were conducted at three streams sites in the Ridge and Valley Province of Tennessee. These data are utilized to construct loosely coupled hydrologic, hydraulic, and channel evolution models and then used to explore response trajectories to urbanization through continuous simulation modeling. Continuous simulation modeling uniquely coupled EPA SWMM with CONCEPTS, where SWMM incorporates planning for stormwater BMPs and CONCEPTS is a sediment transport-hydraulic model predicting channel degradation and aggradation. Results indicate that erosive resistance elements are fundamental controls on dynamics and play a significant role in determining the trajectory of response to urbanization, whereas altered hydrology has an influence on the gradient of that response. These findings have direct application to improving channel protection design standards, as well as, valuing TMDL siltation credits and in-lieu fee programs.

Robert Woockman

Graduate Student
University of Tennessee, Knoxville

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395321 - Channel Protection Best Practices – Coupling Stormwater Hydrology, Stream Hydraulics, and Channel Evolution Geomorphology



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