ELECTRICAL PROBE OF THE SUBSURFACE GEOLOGY FOR GROUNDWATER EXPLORATION IN IREWOLEDE ESTATE, ILORIN KWARA STATE
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Date
2018
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School of Pure and Applied Sciences Modibbo Adama University of Technology, Yola
Abstract
The resistivity method involving an electrical resistivity survey was carried out using Vertical Electrical Sounding in Irewolede Estate of Ilorin west Local Government, Kwara State. This is to map depth to the thickness and the general resistivity distribution of the study area with high groundwater potential. The survey was carried out with Terrameter model DDC-8; a total of eleven VES points and three profiles respectively were covered. The survey lies within the crystalline basement complex of western central Nigeria and is bounded by latitude 080 27’ 40” N, 080 27’ 45“and longitude 40 33’ 11”, 40 33’ 14” E. The resistivity value was obtained between 2 Ωm to 3000mΩ for profiles 1-3. Four prominent geoelectric layers with varying resistivity and thickness were delineated on all the VES points. The first layer has a resistivity value ranging from 48 Ωm to 934 Ωm with their thickness ranging from 0.5m to 1.0m. This layer is the top soil which contributes to the development of groundwater because it is the passage for the flow of surface water to the fractured subsurface layers. The resistivity value of the second layer dominated by laterite ranges between 7.39Ωm to 2479Ωm while the thickness varies between 1.0m to 11.4m. The third layer resistivity values range between 23.4 Ωm to 255 Ωm with variations in their thickness that range between 3.7m to 29.7m. This and the next layer are believed to contain the aquiferous layer. The fourth layer is the fractured basement, which is believed to be a porch for the underground water. The depth of the aquifer in the area ranges between 3.7m to 29.7m. Overburden is the thickness (about 30m) around the southern part of the area.
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Keywords
Vertical Electrical Sounding, Geoelectrical Section, Aquifer, Irewolede Estate, Research Subject Categories::NATURAL SCIENCES