Geophysical Investigation of Groundwater Level Using Vertical Electrical Sounding (A Case Study of Ewu in Edo State Nigeria)
Abstract
In this research work, four Vertical Electrical Soundings (VES) were carried out in Ewu Town at various locations: Eguare-Ewu, Idunwele-Ewu, Flour Mill Road-Ewu and Eko-Ewu using the ABEM terrameter, by employing the Schlumberger electrode configuration system to determine the level of groundwater. From the analysis of field data and results of computer iteration, a maximum of four geoelectric layers were obtained. The first layer of geoelectric section was the lateritic top soil with thickness of 1.21m and 11.1m, for VES 1 and VES 2, with apparent resistivity of 438 ohm m and 183 ohm m. The possible aquiferous zone for sustaining groundwater are within the second and third layers for VES 1 and the fourth layer for VES 2, at a depth of 2.67m to 47m and infinity respectively. The apparent resistivity of the aquiferous layers of VES 1 and VES 2 are 797 ohm m and 362 ohm m respectively, which is fine sand layer. The apparent resistivity of the aquiferous layers of VES 3 and VES 4 are 5511 ohm m and 129 ohm m respectively with infinity thickness.
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