The inundation associated with a levee breach is an important component in assessing the potential consequences of property damage and loss of life associated with the failure. This evaluation can be completed using a 1-dimensional hydraulic model. However, there are several situations where the analysis should be completed with a 2-dimensional hydraulic model, which several 2-dimensional models are available for use. To provide some insight on the difference of some of the more common 2-dimensional models, a comparison study was conducted to assess the potential flood risk associated with a levee breach for a levee in St. Louis, Missouri. The comparison study was completed to provide information to the Modeling, Mapping, and Consequence (MMC) Production Center of the U.S. Army Corps of Engineers in the development of the MMC's Standard Operating Procedures (SOP) for analyzing a levee breach. This paper provides information about three 2-dimensional hydraulic models, including model solution algorithms, model development, and model output; and comparison of the model results. The three 2-dimensional models considered are FLO-2D, TUFLOW, and AdH. Information about the 2-dimensional capabilities being incorporated into HEC-RAS is also discussed in this paper.
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