Electrical Resistivity Sounding for Subsurface Delineation and Evaluation of Groundwater Potential of Araromi Akungba-Akoko Ondo State Southwestern Nigeria (original) (raw)

Electrical resistivity sounding of Araromi area of subsurface units and evaluating the groundwater potential of the area. Forty (40) Schlumberger vertical electrical resistivity soundings were acquired with ABEM SAS 1000 Resistivity Meter. The elec varied from 1-65 m with maximum spread length involved partial curve matching and computer iteration technique using WinResist software. Three to four distinct subsurface geologic layers were identified from the geoelectric layers, aided by borehole lithological logs. These included a lateritic clay/sandy clay/clayey sand/sandy topsoil, clayey weathered layer, partially weathered/fractured basement and the fresh baseme ohm-m and 0.7-1.5 m; 196-472 ohm respectively.. The depth to bedrock varied from 0 to 20.1 m. The bedrock relief was generally uneven, with bedrock elevations that varied between 312 and 346 m above sea level. The bedrock relief map delineated two major parallel basement depressions striking approximately NW The isopach map of the overburden show constituted the dominant aquifer units with tendency for low groundwater potential and thin nature of the overburden. Future groundwater resource developmen feasible in few places characterized by relatively thick