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Title: Nonstructural Flood Risk Mitigation Assessment Along the Platte River : Village of Cedar Creek, NE, city of Louisville, NE
Authors: United States. Army. Corps of Engineers. Omaha District
Keywords: Flood risk management
Interagency coordination
Flood mitigation
Flood control
Cedar Creek (Neb.)
Louisville (Neb.)
Publisher: United States. Army. Corps of Engineers. Omaha District.
Abstract: The Cass County nonstructural evaluation is an evaluation of nonstructural flood risk reduction measures for Louisville and Cedar Creek, Nebraska. Nonstructural flood risk management measures are proven methods and techniques for reducing flood risk and flood damages incurred within floodplains. The project was a Silver Jackets cooperative project between USACE, NDNR, LPSNRD, NEMA, and FEMA. The project received IWR funding. The project had three primary objectives: • Evaluate the feasibility of nonstructural flood risk reduction • Evaluate the costs and potential federal interest of nonstructural flood risk reduction • Evaluate and compare HEC-FDA and FEMA BCA The results of this study showed that there are numerous structures in the two communities at notable flood risk, and nonstructural measures were both feasible and cost effective. Historic floods in the communities include the 1923 Louisville flood which killed 12 people and the numerous Platte River floods at Cedar Creek where flood fighting of a local berm has prevented repetitive flood damages. The cost benefit analysis identifies that a nonstructural approach incorporating 48+ structures could be built which would have a benefit cost ratio greater than 1.00. These are quite conservative cost estimates and the potential for higher structure inclusion is possible. The analysis identifies individual structures with cost-benefit ratios as high as 7.21. Another objective of this study was to compare HEC-FDA and FEMA BCA. The results of this evaluation showed that while FEMA BCA and HEC-FDA produce similar results, and generally trend together, they do not produce identical results. A limited number of structures showed notable discrepancies, some of which could be modeled to align more closely.
Description: Technical Report
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Technical Reports