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This document presents a levee setback case study on the Sangamon River near Beardstown, IL. Five potential setback scenarios were tested using a Hydrologic Engineering Center-River Analysis System (HEC-RAS) hydraulic and sediment model. HEC-RAS results demonstrated differences in flood reduction and sediment trapping opportunities among gate opening and levee-removal scenarios. Levee removal upstream of a bridge and causeway provided the greatest sediment reduction potential. Increasing flow into connected floodplain areas offered intermediate flood and sediment reduction benefits but did not improve natural resource benefits. Levee removal and land conversion provided the greatest natural resources benefit, but substantial economic loss. This study demonstrates the potential benefits of levee setbacks across the U.S. Army Corps of Engineers navigation, ecosystem restoration, and flood management mission areas. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR.

Levee setback utility for mission integration in the Sangamon River floodplain : Illinois Waterway