GEOPHYSICAL INVESTIGATION FOR GROUND WATER DEVELOPMENT WITHIN THE PREMISES OF ABUAD INTERNATIONAL SCHOOL, AFE BABALOLA UNIVERSITY, ADO-EKITI, EKITI STATE, NIGERIA

Oyegoke, S.O. and Babalola, E.O. (2018) GEOPHYSICAL INVESTIGATION FOR GROUND WATER DEVELOPMENT WITHIN THE PREMISES OF ABUAD INTERNATIONAL SCHOOL, AFE BABALOLA UNIVERSITY, ADO-EKITI, EKITI STATE, NIGERIA. JOURNAL OF ENVIRONMENTAL HYDROLOGY, 27 (7). pp. 18-22.

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Abstract

A geophysical investigation is necessary for groundwater development in Basement complex areas like ABUAD International School of Afe Babalola University due to varied geological properties of the underlying aquifers present. A Vertical Electrical Sounding (VES) electrical resistivity method was adopted within the study area. Vertical Eletrical sounding using Schlumberger array was conducted at (6) VES stations. The study was carried out to determine the sub surface layer resistivity and thickness in order to use same to categorize the groundwater potential of the study area. The field data obtained were analysed using the winResist computer software which gives an automatic interpretation and plotting of the apparent resistivity. Generally, results obtained revealed four subsurface/geoelectric layers which are topsoil, hardpan/lateritic clay, weathered basement and fractured basement. The depth to the basement (overburden thickness) beneath the sounding stations is assumed to include the topsoil, lateritic clay and weathered/fractured rock. The values range from 1.0m to 17.9m with an average thickness value of 12.0m. It can be concluded that the low resistivity and significantly thick weathered rock/clay and the fractured basement constitute the aquifer in this area. Results from this study have revealed that The location around the VES 3, 5, & 6 points are the most promising region for borehole development and the estimated depth of the borehole is 60-65m deep and the overburden btw 9.9 – 12.9m

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