Geophysical Investigation of Groundwater Regime: Case Study of Etioro-Akoko Southwestern Nigeria

Abstract

The electrical resistivity study of Etioro-Akoko has become imperative because of non-functional potable water. The study aims at resolving the geology setup through hydro-geophysical methods and modeling of the wells. Dipole-dipole, Schlumberger array and the positioning of the hand dug wells were carried out in the study area. Dipole-dipole array results in the study area do not show structures indicative of high groundwater yield potential. Three layers comprising of the topsoil, weathered layer, and the fresh basement were delineated using the Schlumberger array with overburden thicknesses ranging from 4.5-7.7m.The values are too thin to support productive wells. Well inventory (depth to well-base) results ranges from 5.3-7.3m and were used to model the direction of flow pattern of groundwater. The southernmost part of the map is continuously discharged. To tap into the groundwater resources in this area requires detailed geophysical mapping and investigations of the discharge area.