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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)


Article Title: Flood Forecast: Case Study of Awba, Ona and Ajibode Rivers in Ibadan, Nigeria
by S. O. Adesogan and S.E Dada Oluwatobi

Reduction of risk of flooding depends largely on the amount of information on floods that is available and knowledge of the areas that are likely to be affected during a flooding event. Therefore, it is necessary to use modern day techniques in developing measures that will help government and relief agencies in identification of flood prone areas and in planning against flooding events in the future. There was delineation of flood risk maps for the basin using remote sensing data and GIS tool. In order to achieve the aim of the study, remotely sensed images were acquired for the study area for 1984 and 2016; the data were processed and categorized into various land use based on supervised classification. The Digital Elevation Model (DEM) of the area was processed in the Arc Map software showing various grids and vectors. Then 1 km squared buffer of the flow accumulation map was super imposed on each other to produce the flood risk maps. Results revealed that surface water flows southward throughout the drainage basins and large volume of water accumulates at downstream of the three rivers. Increase in urbanization resulted in decreased vegetation cover leading to increase flooding. About 23.64 % of the drainage basin was within the high flood risk zone, while about 19.41 of the settlements were within the high-risk zone. It is concluded that proper wastes management should be encouraged and there should be strict enforcement of non-settlement within the flood risk map zone.
Keywords: flood risk; mapping; Awba, Ona and Ajibode rivers; Ibadan
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom



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