Hydrological Modeling and GIS-Based Drainage Design for Urban Flood Management in Edaiken, Benin City, Nigeria
DOI:
https://doi.org/10.51967/gets.v4i2.67Abstract
Urban flooding remains a persistent challenge in rapidly urbanizing regions of developing countries, largely due to inadequate drainage infrastructure and increasing surface runoff. This study presents a data-driven approach to flood mitigation through the integration of hydrological modeling, field surveys, and Geographic Information System (GIS)-based spatial analysis in Edaiken, Benin City, Nigeria. The study area was delineated into five sub-catchments (SC1–SC5) using Digital Elevation Models (DEMs) to analyze runoff patterns and flow accumulation. Hydrological parameters, including time of concentration (0.284–0.583 hours), rainfall intensity (137.034–175.972 mm/hr), and peak discharge (0.49–2.78 m³/s), were computed using the Rational Method, while hydraulic capacities were evaluated using Manning’s equation. Results indicate that sub-catchments SC3 and SC4 contribute the highest runoff volumes due to low elevation and high flow convergence. The cumulative discharge increased downstream to approximately 7.00 m³/s, necessitating drainage dimensions ranging from 0.9 × 0.9 m to 1.0 × 1.0 m. The findings reveal that flooding in the study area is primarily driven by undersized drainage systems, poor maintenance, and rapid urbanization. The proposed drainage redesign provides a technically sound framework for improving urban drainage capacity and supporting flood risk management. This study provides a scalable framework for sustainable urban drainage planning in flood-prone cities across sub-Saharan Africa
References
Ahiablame, L., & Shakya, R. (2016). Modeling flood reduction effects of low impact development at a watershed scale. Journal of environmental management, 171,81–91. https://doi.org/10.1016/j.jenvman.2016.01.036
Akan, A. O., & Houghtalen, R. J. (2003). Urban hydrology, hydraulics, and stormwater quality: Engineering applications and computer modeling. John Wiley & Sons.
Alam, S., Rahman, A., & Yunus, A. (2023). Designing stormwater drainage network for urban flood mitigation using SWMM: A case study on Dhaka City of Bangladesh. American Journal of Water Resources, 11(2), 65–78. https://doi.org/10.12691/ajwr-11-2-3
Burrough, P. A., & McDonnell, R. A. (1998). Principles of geographical information systems. Oxford University Press.
Chow, V. T. (1959). Open-channel hydraulics. McGraw-Hill.
Chow, V. T., Maidment, D. R., & Mays, L. W. (1988). Applied hydrology. McGraw-Hill.
Farr, T. G., Rosen, P. A., Caro, E., Crippen, R., Duren, R., Hensley, S., Kobrick, M., Paller, M., Rodriguez, E., Roth, L., Seal, D., Shaffer, S., Shimada, J., Umland, J., Werner, M., Oskin, M., Burbank, D., & Alsdorf, D. (2007). The Shuttle Radar Topography Mission. Reviews of Geophysics, 45(2), RG2004. https://doi.org/10.1029/2005RG000183
Federal Ministry of Works Highway Manual Part 1: Design, Volume IV: drainage Design, 2013.
Hirabayashi, Y., Mahendran, R., Koirala, S., Konoshima, L., Yamazaki, D., Watanabe, S., Kim, H., & Kanae, S. (2013). Global flood risk under climate change. Nature Climate Change, 3(9), 816–821. https://doi.org/10.1038/nclimate1911
Hofmann-Wellenhof, B., Lichtenegger, H., & Collins, J. (2001). GPS: Theory and practice (5th ed.). Springer.
Intergovernmental Panel on Climate Change (IPCC). (2021). Sixth Assessment Report (AR6): Climate Change 2021 – The Physical Science Basis. Cambridge University Press.
Kuichling, E. (1889). The relation between rainfall and run-off. Transactions of the American Society of Civil Engineers, 20, 1–56.
Kumar, M. (2026). Blue green infrastructure for urban flood resilience. International Research Journal of Engineering and Technology (IRJET), 13(1), 486–490. https://www.irjet.net/archives/V13/i1/IRJET-V13I0176.pdf
Manning, R. (1891). On the flow of water in open channels and pipes. Transactions of the Institution of Civil Engineers of Ireland, 20, 161–207.
Monachese, A. P., Gómez-Villarino, M. T., López-Santiago, J., Sanz, E., Almeida-Ñauñay, A. F., & Zubelzu, S. (2025). Challenges and Innovations in Urban Drainage Systems: Sustainable Drainage Systems Focus. Water, 17(1), 76. https://doi.org/10.3390/w17010076
National Emergency Management Agency (NEMA). (2022). Nigeria Flood Situation Report. Abuja, Nigeria.
Nigerian Meteorological Agency. (2020). Rainfall data records and climate reports. Author.
Ologunorisa, T. E., & Abawua, M. J. (2005). Flood risk assessment: A review. Journal of Applied Sciences and Environmental Management, 9(1), 57–63.
United Nations Office for Disaster Risk Reduction (UNDRR). (2018). Economic losses, poverty and disasters 1998–2017.
United Nations Office for the Coordination of Humanitarian Affairs (OCHA). (2022). Nigeria Floods Situation Report.
United States Geological Survey. (2020). EarthExplorer user guide and SRTM data documentation. U.S. Department of the Interior.
World Bank. (2022). Flood risk management and urban resilience report. Washington, DC.
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Copyright (c) 2026 Stephen Olushola Oladosu, Esther Carlie Joshua, Bright Odion Akenbor (Author)
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