Hydraulics & Waterways
394592 - US Army Corps of Engineers - Upper Mississippi River Hydraulic Model - Keokuk, IA to Thebes, IL
Thursday, June 7
8:30 AM - 10:00 AM
Location: Greenway CD
Toby Hunemuller, PE
Chief, Hydrologic Engineering Section
US Army Corps of Engineers, Rock Island District
Don Duncan, St. Louis, MO – US Army Corps of Engineers
The development of the Upper Mississippi River (UMR) Flood Risk Management (FRM) hydraulic model was a collaborative effort by federal and state agencies, facilitated by USACE Rock Island and St. Louis Districts covering 320 river miles from Mississippi River Lock and Dam 19 at Keokuk, IA to Thebes, IL using the Hydrologic Engineering Center’s River Analysis System (HEC-RAS) software version 5.0.3
An updated hydraulic model was needed to serve as the tool for understanding how the system has changed over time (redistribution of risk) while using modeling software that is common to water resources professionals (HEC-RAS). The model was developed with 1D cross sections for the river and 2D flow areas representing leveed areas. The goal of this model is to provide a common tool using the best available data and software that can reasonably recreate a range of events that have occurred or may occur in the future to assess system performance and flood risk management strategies.
The river segment from Keokuk to Thebes was prioritized for Levee Safety funding because the majority of the floodplain in this reach is excluded by levees. In addition there have been numerous changes and updated survey information which has resulted in numerous discussions about the future performance and predictability of the system. The updated hydraulic model for the UMR is an essential tool to understanding the flood risks that currently exist to the river communities and is a critical first step for the development of systemic flood risk management (FRM) strategy. This new model is a tool that can lead to better and more consistent flood risk management.
The presentation will discuss the development, assumptions, coordination, and results of the new hydraulic model. This tool will be available to users up and down the system to evaluate a wide range of projects.