Evaluating Groundwater Resources in Basement Complex Areas Through Electrical Resistivity Techniques
Keywords:
Groundwater, Aquifer, Parameters, Depth, ResistivityAbstract
An approach engaging Vertical Electrical Sounding (VES) was carried out with a view to developing groundwater potential in Akure South local government area of Southwest Nigeria, thirteen (13) depth sounding data were acquired using Schlumberger array, with half maximum current electrode separation (AB/2) varies from 1 to 100 m. The VES data were quantitatively interpreted using partial curve matching and computer aided iteration to determine the geo-electrical parameters of each station. The result revealed a maximum of four (4) geoelectric layers which are topsoil (113-384Ωm), laterite (248-1093Ωm), weathered layer (72-155Ωm) and fresh basement layer (955-9872Ωm). Five (5) parameters namely, hydraulic conductivity, transmissivity, coefficient of anisotropy, aquifer thickness and aquifer resistivity which ranges from (0.0176–0.032) m/s, (0.128–0.3179) m/s2, (1.016–1.7522), (4.0-16.3) m, and (72–155) Ωm respectively were determined from the quantitatively interpreted geo-electrical parameters using the existing groundwater flow equations. The modeled aquifer hydraulic parameters are believed to have relevant contributions towards groundwater occurrence in the area of study. The produced aquifer hydraulic parameters were synthesized via Weighted Linear Combination (WLC)-multi criteria technique to determine the groundwater reservoir potential index (GRPI) values of the area. The GRPI results were processed to produce the groundwater potential map for the area and the direction of the ground water flow was also modeled using ground water modeling (GMS) software. The prediction map classified the area into very low, low and moderate potential zones as areas <95 Ω-m, 95–120 Ω-m, >120 Ω-m respectively. About 85% of the area falls within low groundwater potential rating, the study area can be rated to be of low groundwater potential which can serve the proposed engineering building for domestic purpose.
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