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Mapping urban flood susceptibility in Ouagadougou, Burkina Faso

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Abstract

Ouagadougou, the capital city of Burkina Faso, is facing significant economic and social damages due to recurring floods. This study aimed to develop a flood susceptibility map for Ouagadougou using a logistic regression (LR) model and 14 flood conditioning factors, including elevation, slope, aspect, profile curvature, plan curvature, topographic position index (TPI), topographic roughness index (TRI), flow direction, topographic wetness index (TWI), distance to river, rainfall, land use/land cover (LULC), normalized difference vegetation index (NDVI) and soil type. A historical flood inventory map was created from household survey data, identifying 1026 flooded sites which were divided into a training dataset (70%) and a validation dataset (30%). The factors that had a statistically significant influence (p-value < 0.05 and │Z│ > 1.96) at the 95% confidence level were, in order of importance, elevation, distance to river, rainfall, plan curvature and NDVI. The receiver operating characteristic (ROC) curve method was used to validate the model. The area under the curve (AUC) values of the model were 81% for the prediction rate and 82% for the success rate indicating its effectiveness in identifying areas susceptible to flooding. The results showed that 18.48% of the city is very high susceptible to flooding, 18.99% has high susceptibility, 18.43% has moderate susceptibility, and 19.98% and 24.18% have low and very low susceptibility, respectively. This research provides valuable information for policy makers to develop effective flood prevention and urban development strategies.

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Acknowledgements

The authors are grateful to the Institut International d’Ingénierie de l’Eau et de l’Environnement (2iE) and Université Nazi BONI (UNB) for their support, and the editors and anonymous reviewers for their insightful and constructive suggestions to improve this manuscript. The authors also acknowledge the World Bank Group under the Africa Centers of Excellence for Development Impact (ACE Impact) Project for its support.

Funding

This work was supported by the International Institute for Water and Environmental Engineering (2iE) and the World Bank through the Africa Centre of Excellence Project (ACE-Impact) [Grant Numbers IDA 6388/D443-BF].

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by K.T., T.F. and M.O. The first draft of the manuscript was written by K.T. All authors commented on previous versions of the manuscript. H.K. helped for the funding acquisition. All authors read and approved the final manuscript.

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Correspondence to Karim Traoré.

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Traoré, K., Fowe, T., Ouédraogo, M. et al. Mapping urban flood susceptibility in Ouagadougou, Burkina Faso. Environ Earth Sci 83, 561 (2024). https://doi.org/10.1007/s12665-024-11871-0

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  • DOI: https://doi.org/10.1007/s12665-024-11871-0

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