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

Chukwudi Gbadebo Njoku, Joel Efiong, Nse-Abasi Ndiyo Ayara

Source Title: International Journal of Applied Geospatial Research (IJAGR)11(3)

ISSN: 1947-9654|EISSN: 1947-9662|EISBN13: 9781799806479|DOI: 10.4018/IJAGR.20200701.oa1

MLA

Njoku, Chukwudi Gbadebo, et al. "A Geospatial Expose of Flood-Risk and Vulnerable Areas in Nigeria." IJAGR vol.11, no.3 2020: pp.87-110. http://doi.org/10.4018/IJAGR.20200701.oa1

APA

Njoku, C. G., Efiong, J., & Ayara, N. N. (2020). A Geospatial Expose of Flood-Risk and Vulnerable Areas in Nigeria. International Journal of Applied Geospatial Research (IJAGR), 11(3), 87-110. http://doi.org/10.4018/IJAGR.20200701.oa1

Chicago

Njoku, Chukwudi Gbadebo, Joel Efiong, and Nse-Abasi Ndiyo Ayara. "A Geospatial Expose of Flood-Risk and Vulnerable Areas in Nigeria," International Journal of Applied Geospatial Research (IJAGR) 11, no.3: 87-110. http://doi.org/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.