GROUNDWATER POTENTIAL AND AQUIFER VULNERABILITY STUDIES IN OMADINO IN DELTA STATE, NIGERIA USING SURFACE GEOELECTRIC MEASUREMENT

Abstract

Eight vertical electrical soundings employing the Schlumberger array were carried out with maximum current electrode spacing of 300 m to ascertain the groundwater potential in the area. The apparent resistivity data obtained were iterated using IP2WIN software. The results indicate that the aquifer resistivity and thicknesses ranged from 182 – 1206 Ωm and 5.96 – 20.9 m, respectively. The average thickness of aquifer established in the study is 12.47 m at an average depth of 6.25 m. The longitudinal
conductance revealed that the protective capacity is weak in most part of the area and is best protected in the southeast portion of the study area. The transmissivity obtained for the aquifer in the study area is of moderate potential with values: Tmean = 149.9 m2 day-1, Tmin = 30.2 m2 day-1 , and Tmax = 498 m2 day1. The hydraulic conductivity estimated has a mean value of 11.3139 m/day. The study showed that the south east to northwest portion is best suited for siting of borehole as a result of its thicker aquifer, higher transmissivity and protective capacity