Abstract:
Resistivity surveys were carried out at seven stations within the bhiversiry of Nigeria,
Nsukka and its environs. The objective was to determine areas suitablefor the drilling of
boreholes for grounhvater. The results generated from this survey were interpreted in
terms of the ntirnber of subsurface layers, uqufer thickness, depth to uquifer and
,probable lithology$orrnations. However, lithologic interpretations were curried out using
exis ring borehole data from the area. A BEM Terrrrrnerer SAS 300C insrrument wa.s used
in obtaining the resistivity data Partial manual curve matching techniqu~w~a s initially
employed in interpreting the data and theronfrer n compirtrr iteruted approoch wus used
to arrive at the jinal result. The Schlumberger electrode conjiguration WLIS employed.
Reszrlts show that the depth to water toble in the studv urea fall within the lower ports of
layer 5, at a depth of about 11 0. Om. Thicknesses oj' the top soil vary between 0.8m and
1.2m, witli their resistivities ranging between 50Ch und I l20fi1. The number of layers
encountered is 6 and 7. Geological interpretation based on avaihble borehole lithologs
of the area shows that the subsurface comprises lateritic sandstone in the Nsukka
Formation and coarse - medium grained sandstones in the .4jali Formation.
Keywords: Vertical Electrical Sounding, Resistiviry, Water tub1 Aqu@r
deptldtlticknrss, Groefectric Section.