Hydrogeophysical investigation for groundwater potential in central Minna, Nigeria.

Abstract

This hydro geophysical investigation is aimed at delineating the aquiferous units in the central part of Minna by determining their depths, thicknesses, resistivities and the potential borehole depth at various locations within the area employing the technique the Vertical Electric Sounding (VES) using the Schlumberger array. A grid of 7 profiles with a total of 49 sounding stations was occupied. The area was found to be underlain by 4 geological formations. The second and third formations underlying parent bedrock form the aquiferous unit. This unit was found to have an average resistivity value range of 120 – 900 Ωm and an average
thickness of 25 m. It is deeply seated in some areas with an average depth of 25 – 30 m.

Keywords: Vertical Electrical Sounding (VES), Resistivity, Aquifer, Borehole.