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Assessment of flood inundation mapping of the Catalpa Creek Watershed in Mississippi by 2-d hydraulic modelling
Proceedings of the 2022 Mississippi Water Resources Conference

Year: 2022 Authors: Poudel S., Roldan M., Ramirez Avila J.J., Czarnecki J., Schauwecker T., Achury S.O.

The Catalpa Creek Watershed in Mississippi is very susceptible to flooding events especially flash floods. The watershed is characterized by very mild slopes and alluvium clay rich soils which make the basin highly vulnerable to flooding. Although floods cannot be controlled completely, the flood risk hazards can be minimized by having an advance information of extreme flood prone zones of the watershed. By predicting the water level of the adjoining streams in different rainfall scenarios, the flood inundation extent of a location within the watershed can be identified. To assess the flood inundation, hydrologic simulations are carried out and a 2-D hydraulic model of the watershed is developed. The Hydrologic Modeling System (HEC-HMS) is used for the hydrologic modeling work, whereas the River Analysis System (HEC-RAS) model is used to develop the hydraulic model and flood inundation map. The flood depth, water surface elevation and velocity distribution are simulated to determine the extent of flooding. The developed hydraulic model is calibrated based on the Manning's roughness coefficient by comparing with the downstream rating curve. The results obtained from the model are maximum water depth and maximum flood velocity at the time of peak runoff for several flood prone zones within the watershed.

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