Abstract
Geoelectric survey employing Vertical Electrical Sounding (VES) was carried out in order to assess the groundwater repositories. A total of seven soundings were obtained with their layer resistivity, thickness and depth within the maximum electrode separation. The geoelectric parameters obtained were used to estimate the Dar-Zarrouk parameters (longitudinal conductance and transverse resistance), hydraulic conductivity and transmissivity. The result shows the aquifer resistivity ranging from 77.14 to 784.76 Ωm, with thickness ranging from 28.78 to 80.04 m. The longitudinal conductance have values ranging from 0.071 to 0.825 Ω-1 while the values of hydraulic conductivity and transmissivity range from 1.087 to 5.881 m/day and 60.180 to 374.031 𝑚2/day respectively. The contour maps generated show the variation of these parameters across the subsurface, and areas with poor protective capacity were delineated. The results also delineate the groundwater potential of the study area as moderate, while the corrosivity rating indicates non-corrosive and slightly corrosive.
Highlights
Electrical resistivity technique has been successfully employed in groundwater exploration due to the fact that it is non-invasive and relatively cheap geophysical technique
This study focused on evaluating the groundwater potential, corrosivity and the distribution of the aquifer parameters in the study area, this will give useful information that will guide against drilling of unproductive boreholes
The aquifer thickness ranged from 28.78m to 80.04m, the relatively high aquifer thicknesses indicate the presence of prolific aquifers
Summary
Electrical resistivity technique has been successfully employed in groundwater exploration due to the fact that it is non-invasive and relatively cheap geophysical technique. Electrical resistivity method involving VES has proved to be useful in groundwater study (George et al, 2014; Ibuot et al, 2013; Niwas and Singhal, 1981; Singh, 2005; Soupious et al, 2007) This method has been widely used in groundwater exploration to determine depth to water table, aquifer geometry and groundwater quality by analyzing measured apparent resistivity field data. The study area has witnessed an increased in population which has signal an increase in local economy, the inhabitants being farmers, civil servants, students etc They rely mostly on boreholes as a major renewable fresh water source increasing the demand for potable water supply. In order to pursue large scale development of groundwater, it is essential to have reliable information that will aid in determining groundwater potential
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