Atumah O Lawrence and Idiegbe O Gilbert
Delta State Polytechnic, Nigeria
Title: Geophysical investigation of groundwater level using vertical electrical sounding - A case study of EwuIn Edo State, Nigeria
Biography
Biography: Atumah O Lawrence and Idiegbe O Gilbert
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 1.21 m and 11.1, for VES 1 and VES 2, with apparent resistivity of 438 Ωm and 183 Ωm. 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 2.67 m – 47 m and infinity respectively. The apparent resistivity of the aquiferous layer of VES 1 and VES 2 are 797 Ωm and 362 Ωm respectively, which is a fine sand layer. The apparent resistivity of the aquiferous layer of VES 3 and VES 4 are 5511 Ωm and 129 Ωm respectively with infinity thickness.