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A Geospatial Expose of Flood-Risk and Vulnerable Areas in Nigeria

A Geospatial Expose of Flood-Risk and Vulnerable Areas in Nigeria
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Author(s): Chukwudi Gbadebo Njoku (University of Calabar, Nigeria), Joel Efiong (University of Calabar, Nigeria) and Nse-Abasi Ndiyo Ayara (University of Calabar, Nigeria)
Copyright: 2020
Volume: 11
Issue: 3
Pages: 24
Source title: International Journal of Applied Geospatial Research (IJAGR)
Editor(s)-in-Chief: Donald Patrick Albert (Sam Houston State University, USA) and Samuel Adu-Prah (Sam Houston State University, USA)
DOI: 10.4018/IJAGR.20200701.oa1

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Abstract

Flooding is recurrent in Nigeria, occurring yearly at different scales. This geared the need for a study to reveal local government areas (LGAs) that are at risk and vulnerable to flooding. The multi-criteria approach was adopted, using geospatial techniques and data. Factors considered were elevation, slope, rainfall intensity, and distance to river. The factors were classified, reclassified, rated, and weighed in a systematic process. Nineteen states and 114 LGAs face high risks, especially communities in the Niger Delta, around the lagoons of Lagos, along River Niger, Benue, and the Cross-River. Also, 125 LGAs in 18 states face medium flood-risk vulnerability. Consideration the population density of communities, Lagos State is the most vulnerable because of LGAs with high population densities within high flood-risk zones. Other states with communities exposed to high flood-risk vulnerability include Rivers, Kogi, Cross River, Akwa Ibom, Anambra, and Delta. The study provides information key to proactive policy formulation, mitigation, and adaptation to flood risk in Nigeria.

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