Geo-electrical investigation of Groundwater potential at The Polytechnic,Ibadan,North Campus Southwestern,Nigeria [ ]


Electrical resistivity survey has been carried out at The Polytechnic, Ibadan North Campus to characterize the subsurface geoelectric sequences and evaluate the ground water potential of the area.The area is underlain by Precambrian basement complex of Southwestern Nigeria. A total of thirty five Vertical Electrical Sounding stations were conducted across the areas using Schlumberger electrode array with maximum half current electrode (AB/2) spacing of 75m. The interpretation of the VES result revealed three to five geoelectric layers comprising the top soil, lateritic clay, weathered basement, fractured basement and presumably fresh bedrock. The weathered and fractured basement are the aquifer types delineated for the area with the fractured basement being significant in enhancing the groundwater potential in the area. The weathered basement in about 80% of the area is clayey and has low permeability but offers moderate to high protective capacity to the underlying fractured basement aquifer.The resistivity of the fractured basement range from 96-846ohm-m with a mean value of 403 ohm-m.Based on the value of geoelectic parameters obtained, the groundwater potential of the area is rated medium to high. A sustainable groundwater development project is therefore feasible in the institution.