Abstract
Floods are the most frequent and destructive natural disaster affecting human settlements, livelihoods and the environment. Over the past two decades, economic losses due to hydro-climatic disasters such as flooding have risen more than threefold. Although floods cannot be prevented completely, their impact can be reduced through appropriate preparation and organisation in areas that are at risk. This research aimed at modelling the flood hazard occurrence in the eastern parts of the Save Catchment of Zimbabwe. The height above channel base for the study catchments, together with the flood presence and absence data were run in a logistic regression and in a Geographic Information System (GIS) to determine the probability of flood occurrence at specific places. The results show a significant negative relationship between the height above channel base and flood-risk probability. Over 20% of the studied catchment area is noted to be flood safe, and 62% is shown to be moderately vulnerable to flooding. A further 18% of the area is zoned to be at high risk of flooding. Well-engineered institutions and stakeholders were found to be key in the effective utilisation of flood-risk maps generated from GIS projects to enhance community resilience to flooding. Furthermore, a contingent flood hazard management plan has been produced for the area.
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Nhamo, G., Chikodzi, D. (2021). Tropical Cyclone Idai and Flood Hazard Modelling in the Eastern Parts of the Save Catchment, Zimbabwe. In: Cyclones in Southern Africa. Sustainable Development Goals Series. Springer, Cham. https://doi.org/10.1007/978-3-030-72393-4_14
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DOI: https://doi.org/10.1007/978-3-030-72393-4_14
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