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Geo-electrical exploration for groundwater within the premises of university of Ilorin teaching hospital, Ilorin, Kwara state, Nigeria
Abstract
Schlumberger Vertical Electrical Soundings for groundwater search within the premises of
University ofllorin Teaching Hospital(UITH) situated along Ilorin-Jebba road in Kwara state, were carried out with a view to establishing the different subsurface geoelectric layers, the aquifer units· and their hydrogeologic properties. Data were collected from 12 VES stations over· an area of about 500m x 650m. From the quantitative interpretation of the data collected, using the usual method of' curve matching with the Orellana-Mooney Master curves and 1-D forward modeling with WinResist 1.0 version software, four Iithologic units were identified. These include: the topsoil, the lateritic layer, the weathered layer/fractured layer and the fresh basement. The weathered and fractured basement constitutes the main aquifer units. The 2-D resistivity structure has elicited 2 lobes oflow resistivity which constitutes the prospective zone for water in the area. The first lobe exists.below stations 3 and 4 at about 5-15 m depth, with resistivity between 80- 14 7 ohm-m and over 300m wide, while the other lobe oflow resistivity which also signifies a possible borehole location exists below stations 7, 8 and 9 at a depth of about 2-14 m, with resistivity between 141 ~200 ohm-m and over 550m wide. The study concluded· that the area investigated contains two lobes of low resistivity whi~h could be explored for water supply.
Keywords: Aquifer, Lobe, Resistivity, lithology, geo-electric, borehole.
