Flood Vulnerability Study of Oha River Basin, Nigeria
Ibiyemi Abisola JESULEYE
Cooperative Information Network (COPINE), Advanced Space Technology Application Laboratory (South-West) National Space Research and Development Agency (NASRDA), Ile-Ife, Nigeria
Bowale Ayodeji BABALOGBON
Cooperative Information Network (COPINE), Advanced Space Technology Application Laboratory (South-West) National Space Research and Development Agency (NASRDA), Ile-Ife, Nigeria
72-83
Vol: 13, Issue: 3, 2023
Receiving Date:
2023-08-10
Acceptance Date:
2023-08-14
Publication Date:
2023-08-25
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http://doi.org/10.37648/ijrst.v13i03.006
Abstract
The increasing episodes of flood bringing about enormous damage to lives and properties in different parts of South-western region of Nigeria, served as a key rationale for this study. It thus mapped out a pragmatic plan to measure the spatial attributes and factors aggravating the impact of flood in Oha River basin, one of the major sub-basins in the region, as a contribution to the basic data sets, frame, and baseline information required to mitigate the devastating impact of flood in South-western Nigeria. The study delineated Oha river basin as a sub-basin from the regional basin, generated some thematic datasets (such as drainage, elevation/height, and soil) and produced flood vulnerability rating map of the basin. Multi-Criteria Decision Methods (MCDA) technique was employed using an indigenous software, SAVEMACE, to model the vulnerability case while Geographic Information System (GIS) environment was used to prepare the data and also present the visualisation of the vulnerability results. The factors considered in MCDA analysis were Elevation, Distance to Stream, Slope, Rainfall, Land Use Land Cover (LULC) and Soil. The results from the flood vulnerability modelling showed that 4.34% of the study area was least vulnerable to flooding, 37.28% was found marginally vulnerable, 55.73% was moderately vulnerable while 2.65% was found to be Highly vulnerable to flooding. The established degree of vulnerability of Oha basin to flood disaster would provide a framework for effective resources allocation to flood monitoring and control in the area.
Keywords:
Oha basin; Nigeria; MCDA; GIS; Flood; Vulnerability
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