Geophysical Survey for Ground Water Development in Ajayi Crowther University And Its Environment

Abstract

This study investigates optimal locations for productive boreholes for groundwater exploration at various premises of Ajayi Crowther University, Oyo, Oyo State. Specific locations include the ACU Staff School, Diocese of Lagos West Female Hostel, Vice Chancellor's Office, Ibadan Hostel, Faculty of Basic and Medical Science, Wole Olanipekun Lecture Building, and the University Complex. A geophysical site investigation using the Advanced Magneto-Telluric Equipment (ADMT) series instrument was conducted, utilizing the natural electromagnetic field to study the earth's electrical structure. This method differentiates frequencies of electromagnetic waves with varying skin depths in conductive materials, aiding the identification of underground geological formations. The sites are characterized by Precambrian basement rocks overlain by alternating layers of sands and clay, with common rock outcrops including clay, sandstones, quartzite, and migmatite gneiss/gneiss complex. The topography is undulated and elevated above sea level. Data sampling involved inserting M and N measuring electrodes into the ground, systematically moving them to cover the entire profile, and plotting the results in Isoline (3D) graphs. The findings indicated that the sandy, weathered, and fractured geological units are the most promising for groundwater occurrence. The geo-electric parameters established suggest potential suitability for groundwater, with site-specific recommendations. These recommendations suggest that the identified locations across the university premises are promising for productive boreholes, ensuring effective access to groundwater resources.