INVESTIGATION OF GROUND WATER CAPACITY OF OKADA AND ITS ENVIRONS USING ELECTRICAL ESISTIVITY METHOD IN ACQUIFER POTENTIAL MAP

Electrical resistivity survey was carried out to investigate the groundwater capacity of Okada, an urban sedimentary area with the oldest Cretaceous rocks (sandstones and shales) which are of Albian age. The equipment used for the survey include, ABEM terrameter (SAS, 300C), four electrodes, hammer, four reels of wires, connecting cords, measuring tapes and global positioning system (GPS). This geological study was carried out in three different locations.  The field layout employed was the Wenner-schlumberger array.  The result of the survey shows that the average resistivities are 1337.8Ωm for the first layer, 5914. 34 Ωm for the second layer, 1277. 59 Ωm for the third layer, 189. 65 Ωm  for the fourth  layer and 695.78 Ωm  for the fifth layer with probable lithologic interpretations as lateritic over-burden for the first layer,and highly compact clay stone for second layer, fissile dry shale, splintery shale(wet) and saturated and pyritised silty shale (wet) for the other three layers, respectively. The result indicates that potential groundwater is found in the fourth layer of the study area.