Resistivity Prospecting for Groundwater Potential at the Proposed Ibrahim Badamasi Babangida University Teaching Hospital, Lapai, Niger State
DOI: https://doi.org/10.33003/jobasr-2023-v1i1-19
Emmanuel.
A. G.
Tsepav.
M. T.
Yusuf.
T. U
Abstract
Resistivity methods have been increasingly used for aquifer characterisation due
to their high level of effectiveness. In this study, electrical resistivity survey was
carried out at the Proposed Ibrahim Badamasi Babangida University Teaching
Hospital Lapai Niger State Nigeria in order to study the groundwater potential
with a view of determining the depth to the bedrock and thickness of the
overburden protective capacity. Vertical Electrical Sounding (VES) using
Schlumberger array was used to occupy thirty (30) VES stations using ABEM
Terrameter (SAS 300) for the acquisition of apparent resistivity data. The field
data obtained was analysed using computer software (IPI2win) which gave the
secondary geoelectric parameters of depth, layer thickness and layer resistivities.
The results revealed heterogeneous nature of the subsurface geological sequence
comprising top soil (clayey-sandy and sandy-lateritic), weathered layer, partly
weathered (fractured basement) and fresh basement. The resistivity value for the
topsoil layer varied from 20Ωm to 600Ωm with thickness ranging from 0.5 to 7.2
m. The weathered basement had resistivity values ranging from 15Ωm to 593Ωm
while the thicknesses varied between 2.75 and 33.04m. The fractured basement
had resistivity values ranging from 201Ωm to 835Ωm and thicknesses having
values between 11 and 20.4m. The fresh basement (bedrock) had resistivity values
ranging from 1161Ωm to 3115Ωm with infinite depth. The depth from the earth’s
surface to the bedrock surface varied between 2.5 to 47.75m. The VES 10, 11 and
19 had very good overburden protective capacity and can serve as good sites for
borehole drilling.
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