Geoelectrical Characterization of Aquifer Precincts in Parts of Lapai, North Central Nigeria

Abstract

Some geoelectric characteristics of aquifer in parts of Lapai, Central Nigeria were evaluated using Wenner vertical electrical sounding (VES) method. Fifteen (15) VES points were occupied using G41 Geotron Resistivity meter with electrode spacing varying from 10m to 150m while a global positioning system (GPS) tracking device was used to locate the VES points. The 1xD Interprex interpretation software was used for the data interpretation which revealed four layers comprising the top lateritic soil, silty /clayey, weathered basement and fresh basement rocks. The resistivity of these layers varied from 4.54Ωm to 27987.60Ωm while the depth varied from 0.440m to 1079.5m. Longitudinal conductance and transverse resistance calculated from the layers' thicknesses and resistivities varied from 0.00039Siemens to 2.05Siemens and 3.96×10 6 Ωm 2 to 3.34×10 7 Ωm 2 respectively.