APPLICATION OF GIS TECHNIQUES IN MAPPING OF FLOOD AND EROSION RISK AREASOlumuyiwa Idowu Ojo, Masengo Francois Ilunga and Isaiah Oluwakayode Ogunwobi
Erosion is the major factor affecting the sustainability of agricultural production. The leading factors causing erosion include increased population pressure resulting in forest/woodland clearance for wood and small holding agriculture; traditional agricultural practices; and declining land productivity. Reduction of risk of flooding and erosion depend largely on the amount of information on floods and erosion that is available and knowledge of the areas that are likely to be affected during a flooding and erosion event. The aim of this study was to assess and identify the areas prone to flood and erosion in Ibadan, Nigeria using GIS techniques. This study adopted GIS to identify and map flood and erosion risk areas in Ibadan and its environs. Flood and erosion risk maps were produced identifying three category risk areas; high, medium and low risk areas. Strategies for mitigating against flood and erosion risks were discussed and some recommendations were made to help the Nigerian government authorities to improve on flood and erosion management in the country.
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