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Title: Development and application of the CASM-SL to support nutrient management in potential Sangamon River levee setbacks
Authors: Bartell, Steven M.
Woodard, Cindy T.
Theiling, Charles H.
Dahl, Travis A.
Keywords: Ecosystem services
Environmental management
Flood control
Floodplain management
Sangamon River (Ill.)
Stream restoration
Publisher: Coastal and Hydraulics Laboratory (U.S.)
Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC TR-20-9
Abstract: Levee setbacks are defined by the intentional relocation of levees away from the river bank. This placement is often done to reduce flood risk, but it can also have environmental benefits. The Comprehensive Aquatic System Model (CASM) was used to look at the potential fate of nutrients and several environmental benefits for five potential management scenarios along the lower Sangamon River in Illinois. The model results showed that two scenarios were much more environmentally favorable relative to the outcomes considered here. One of the scenarios, where the existing gates were operated to allow the river access to the area behind the levee during extreme floods, was better at nitrogen and phosphorous accumulation. Removing the gates and creating a levee setback at this same site produced more aquatic plants, invertebrates, and fish but was not as effective at nutrient accumulation. This application of CASM demonstrates the potential of the model to provide objective rankings for the environmental benefits of levee setbacks.
Description: Technical Report
Gov't Doc #: ERDC TR-20-9
Rights: Approved for Public Release; Distribution is Unlimited
Size: 51 pages / 975.82 kB
Types of Materials: PDF/A
Appears in Collections:Technical Report

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