ABSTRACT

In this study, Remote Sensing (RS), Land-sat 8 digital data, and digital elevation models (DEMs) from the Advanced Space-borne Thermal Emission and Reflection Radiometer (ASTER), Food and Agricultural Organization (FAO) along with other stereotypical data such as geology and rainfall were digitized and analyzed to create various thematic maps (geology, land use/cover, soil, drainage density, rainfall and slope maps) required for groundwater modelling in the study area. These thematic maps were assigned well-chosen weights and different rankings to the individual categories within each thematic map using Saaty’s Analytical Hierarchy Process (AHP). The groundwater potential zones were achieved by overlaying the thematic maps using the spatial analysis tool in Arc-GIS 10.4. The result gotten was verified with pumping test data and well water levels. The results reflected that the study area had three groundwater potential zones namely, „high‟, „moderate‟ and „low‟, covering 30.27% 62.35% and 7.38% of the study area respectively, the total area is 438km2 out of which 132.58km2 is high potential zone, 273.1km2 is moderate zone and 32.32km2 is low zone. In addition, this study established that Oke-ero LGA has 65.7 million cubic meters (MCM) groundwater potential annually.

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