Groundwater Potential Evaluation of Federal Polytechnic Ado–Ekiti Using GRRT–Index

Groundwater Potential Evaluation of Federal Polytechnic Ado–Ekiti Using GRRT–Index

The Vertical Electrical Sounding (VES) data method was used to acquire data in the study area and they are presented as depth sounding curve which is obtained by plotting apparent resistivity values against electrode spacing on a log-log or bi-log graph paper. The processed data were subjected to both detailed interpretations aimed at unravelling the subsurface groundwater potential and aquifer protective capacity of overburden units in the study area. The partial curve matching of the data obtained was done and computer iteration of each VES points was processed, in other to have the geo-electrical parameters of the surveyed area for proper groundwater mapping of the area. Twenty and six VES points was acquired, the curve types are QHA, QHK, QHA, HAK, HKH, AAK, AAA. Layer 1 and 2 has relative high resistance top soil and high resistance lateritic hardpan/sandy clay. In basement complex terrains, the intermediate layer H-type is commonly water saturated and it’s often characterized by high resistivity, high porosity, low specific yield and permeability which is good for groundwater. In order to have good understanding of the subsurface geology of the study area, calculations were made via the geological data, relief, resistivity values and thickness parameter obtained in the area in other to generate or obtained the potential map of the study area and this was able to reveal the lateral and subsurface information about the quantity and abundance of groundwater in the area of investigation. Based on these facts, we can conclude that water cannot be gotten from the study area of high resistivity. A similar study reveals that areas with thick overburden cover have high potential for groundwater. Consequently, areas with overburden thickness of 10m and above are good for groundwater development. Contour plot of aquifer resistivity, aquifer depth, aquifer thickness and traverse resistance were constructed.

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International Journal of Earth Sciences Knowledge and Applications-Cover
  • Başlangıç: 2019
  • Yayıncı: Ekrem KALKAN
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