Geophysical Techniques for Assessing Groundwater Potential in Basement Complex Terrains

This paper presents the results of the interpretation of electrical resistivity survey using Schlumberger array at a test site (Ogodo Agbe, Akungba Akoko) in Akoko Southwest of Ondo state, in order to evaluate groundwater potential in the area.

The electrical resistivity method was used for detailed investigation in the study area. The results gotten from the investigation allow the study area to be classified into poor, intermediate and high groundwater potential zone. Zones with poor overburden thickness, poor weathered layer resistivity coupled with poor weathered layer thickness and high bedrock relief are considered to have poor groundwater potential, while zones with intermediate overburden thickness, intermediate weathered layer resistivity, intermediate weathered layer thickness and depressed bedrock relief are favorable to groundwater accumulation; hence are classified as zones with intermediate groundwater potential. While zones with high overburden thickness, good weathered layer resistivity, high weathered layer thickness and highly depressed bedrock relief are favorable to more groundwater accumulation; are therefore classified as zones with high groundwater potential. The results of the findings serve as a guide for citing productive boreholes and provide a reference for future geophysical development in the selected region.

Electrical resistivity array, Groundwater, Potential zone, weathered layer, Bedrock relief

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