Assessment of Floodplain Inundation Mapping of Davenport City in Iowa Using Civil Geo-HECRAS
Publication: World Environmental and Water Resources Congress 2021
ABSTRACT
Extreme flood events have become increasingly common and unpredictable throughout the world in recent times. Mississippi River, located in the Upper Mississippi River Basin, has instigated many historic floods in the Mid-West, of which the flooding of Davenport, Iowa, in 2019 is a major one. Due to the disastrous flooding events, the loss of the economy is increasing in the city of Davenport. This study focused on flood frequency analysis and floodplain inundation mapping of different flood events of Duck Creek in Davenport. Gumbel distribution, generalized extreme value (GEV), and Log Pearson III were utilized for the frequency analysis, and the distribution with the best fit was evaluated by utilizing the Kolmogorov–Smirnov (KS) test. Using the Civil Geo-HECRAS created by the CivilGeo team, flood plain inundation mapping was prepared for the 2019 flooding event at different recurrence intervals. For the analysis, the terrain data and historical flow data were extracted from the United States Department of Agriculture and the United States Geological Survey website, respectively, available in the Civil Geo-HECRAS interface. The model was calibrated and validated using different flooding events. Then, the results were compared with the Federal Emergency Management Agency flood extent map. The developed flood inundation maps suggest that the residential areas located along the banks of the Duck Creek are certainly at the flood risk zones and thus require flood management measures. This study will be helpful for effective floodplain management of extreme events and would be beneficial for sustainable urban planning.
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World Environmental and Water Resources Congress 2021
Pages: 179 - 192
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© 2021 American Society of Civil Engineers.
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Published online: Jun 3, 2021
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