Groundwater Potential Evaluation in Parts of Southwestern Nigeria Using Dar-Zarouk Parameters
Date
2022-03
Authors
Journal Title
Journal ISSN
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Publisher
LAUTECH Journal of Civil and Environmental Studies
Abstract
Dar-Zarouk parameters namely longitudinal conductance, transverse unit resistance, longitudinal
resistivity, traverse resistivity, and coefficient of anisotropy, derived from electrical resistivity
soundings,were employed in the western and south western portions of Sheet 223 Ilorin NW,
Southwestern Nigeria to evaluate the subsurface water prospect. This is aimed at determining the
potentiality and vulnerability of groundwater in the area.The longitudinal conductance values obtained
range from 0.027 S at VES 3 in the north, indicating the poorest protective capacity, to 26440.95 S at
VES 157 in the south, indicating the highest protectivity. Thus, the protective capacity rating of the study
area shows very poorly, weak, moderate, good, and excellent ratings at VES stations 10, 12, 9, 2, and 178
respectively.The total transverse resistance range is 8.6 - 32733.87 Ωm2
, with the lowest at VES 206 in
the southeastern part, indicating high prospects, and the highest at VES 47 in the northern part of the
area, indicating poor prospect.The lowest longitudinal resistivity (0.1951 Ωm), indicating high potential
as well, occurs at the southern part and while the highest value of 8095.63 Ωm is obtained at the northern
part.Furthermore, the coefficient of anisotropy in the area ranges between 0.029 and 5349.78. The south western boreholes have values that fall between the standard range of 1.39-1.66, indicating that those
areas have boreholes with high productivity.In conclusion, most parts of the study area have excellent
protective capacities and high potentiality.
Description
The article evaluated groundwater potential of the area using Dar-Zarouk parameters which include longitudinal conductance, transverse unit resistance, longitudinal resistivity, traverse resistivity, and coefficient of anisotropy, derived from electrical resistivity soundings. The evaluation revealed areas with high or low groundwater potentiality and productivity.