Authors : Odeyemi Emmanuel Oloruntoba, Daodu Oluwafemi and A. Olaonipekun Oluwasegun
Abstract: The availability of water is one challenge confronting Landmark University community an institution on the outskirt of Omu-Aran, Southwestern Nigeria. Geophysical survey was carried out to evaluate the ground water potential of the basement complex and to delineate potential locations for siting boreholes within the community. A total of seven Vertical Electrical Sounding (VES) were carried out. Data acquisition involved the use of shlumberger electrode configuration with half current electrode spacing (AB/2) ranging from 1-100 m. Interpretation of the geoelectric data involved the use of curve matching technique and computer iteration. Available lithologic data from previous workers were used to evaluate geophysical results. The interpretation revealed three and four model curves, H, HA, A and KH-types with the KH-type curves being the dominant types. Four subsurface layers comprising top soil, lateritic soil, weathered layer, fractured basement and fresh basement were inferred from the interpretation. The top/lateritic soil layers are of varying thickness and resistivity values. The fractured and weathered basements with relatively lower resistivity are inferred to be aquiferous zone and could bear productive water for ground water supply. The basement has the lower most infinitely thick layer with resistivity mostly <1500 Ωm. The results of the soundings greatly contribute to the understanding of the hydro geology of the basement complex. The fractured and weathered basement aquifers can be developed for suitable water supply to the university community.
Odeyemi Emmanuel Oloruntoba, Daodu Oluwafemi and A. Olaonipekun Oluwasegun, 2019. Geophysical Investigation of Aquifer Layer of Landmark University Community, Omu-Aran, Nigeria using Electrical Resistivity Method. Journal of Engineering and Applied Sciences, 14: 4285-4289.