keywords: Vertical electrical sounding (VES), Groundwater, Depth, Fracture, Aquifer and Borehole
Geophysical investigation was carried out with the aim of determining favorable site for erecting a yield borehole which will serve as a source of water supply in Modoji, Katsina Local Government of Katsina State, Nigeria. In order to study the groundwater potential in the area. Vertical Electrical Sounding (VES) using Schlumberger array was carried out at twelve (12) stations. The field data obtained has been analyzed using Computer Software (ipi2win) which gives an automatic interpretation of apparent resistivity. The VES result revealed the heterogeneous nature of the subsurface geologic sequence. The geologic sequence beneath the study area is composed of topsoil (sandy-clay and sandy-lateritic), weathered basement, fracture basement layer and fresh basement. However, fracture basement and fresh basement do not show lateral variation in the basement resistivity. The result aim is to determine a favorable site for erecting a yield borehole which will serve as a source of water supply in some parts of Modoji Katsina local government. The result of the investigation revealed the various resistivity sound curves of the VES points which clearly identify the depth of the aquifer layer of this research to be from 10.8m to 57.8m. The high yielding areas are based on the high thickness of the aquiferous layer.