Differentiated Spatial-Temporal Flood Vulnerability and Risk Assessment in Lowland Plains in Eastern Uganda
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
Hydrology
Abstract
This study was conducted to map flood inundation areas along the Manafwa River, Eastern
Uganda using HECRAS integrated with the SWAT model. The study mainly sought to evaluate
the predictive capacity of SWAT by comparisons with stream flow observations and to derive, using
HECRAS, the flood inundation maps. Changes in Land-use/cover showed by decrease in forest
areas and wetlands, and conversions into farmlands and built-up areas from 1995 to 2017 have
resulted in increased annual surface runoff, sediment yield, and water yield. Flood frequency
analysis for 100-, 50-, 10-, and 5-year return periods estimated peak flows of 794, 738, 638, and
510 m3/s, respectively, and total inundated areas of 129, 111, 101, and 94 km2, respectively. Hazard
classification of flood extent indicated that built-up areas and commercial farmlands are highly
vulnerable, subsistence farmlands are moderately to highly vulnerable, and bushland, grassland,
tropical high forest, woodland, and wetland areas are very low to moderately vulnerable to flooding.
Results demonstrated the usefulness of combined modeling systems in predicting the extent of flood
inundation, and the developed flood risk maps will enable the policy makers to mainstream flood
hazard assessment in the planning and development process for mitigating flood hazards.
Description
Keywords
Eastern Uganda, Flood plains, Flood hazard maps, HEC-RAS, Return period, SWAT
Citation
Erima, G.; Kabenge, I.; Gidudu, A.; Bamutaze, Y.; Egeru, A. Differentiated Spatial-Temporal Flood Vulnerability and Risk Assessment in Lowland Plains in Eastern Uganda. Hydrology 2022, 9, 201. https://doi.org/10.3390/ hydrology9110201