Abstract
A combined surface and subsurface resistivity investigation was conducted in Aghalokpe with a view to providing adequate information about the subsurface layers, groundwater potential and quality of the area. Twelve (12) Schlumberger depth soundings and one (1) single-point resistance logging were carried out in the study area. Four subsurface layers were delineated from the investigation. The first layer is the top soil and has resistivity values ranging from 92-1009.1 ohm-m and thickness between 0.8-1.6m. The second layer composed of clay and sand has resistivity values varying from 61.9-1571.2 ohm-m and thickness ranging from 1.3-16.1m. The third and fourth geoelectric layers with resistivity values ranging from 414.8-4091.1 ohm-m diagnostic of fine and medium to coarse grained sands constitute the aquifer unit and occur at an average depth of 10.8m and extend beyond 63.8m. The result of the water quality based on total dissolved solids computed from the single-point resistance log showed that the groundwater in the upper part of the aquifer may not be potable because of TDS concentration above the lower limits of general acceptability of 500 ppm. But at the depth of 18-50m, the quality of the groundwater seems to be potable.KEY WORDS: Potable Water, Geoelectric, Resistivity, Formation Factor, Electrical Conductivity
Highlights
Groundwater cannot be seen on the earth’s surface, a variety of surface investigation techniques can provide information about its occurrence
The geoelectric sections (Figure 4) that was drawn from the interpreted results show four geoelectric layers
The second layer which has resistivity values varying from 61.9-1571.2 ohm-m are presumably clay/fine sand/medium sand
Summary
Groundwater cannot be seen on the earth’s surface, a variety of surface investigation techniques can provide information about its occurrence. Though there are various geophysical techniques employed in assessing groundwater source, the electrical resistivity method remains the most useful and cost-effective techniques in groundwater studies (Koefoed, 1979; Rubin and Hubbard, 2005). Various studies (Akpoborie et al, 2000, Olobaniyi et al, 2007) have indicated that these shallow aquifers are vulnerable to contamination from surface and non-surface sources. A detailed study of groundwater and conditions under which it occurs can be made by supplementing surface investigation with well log data which gives a clearer picture of groundwater occurrence. Quality of groundwater can be assessed based on total dissolved solids as dissolved solids in groundwater can pose hazards if their presence goes undetected
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