GEOELECTRIC INVESTIGATION OF GROUNDWATER POTENTIAL IN SITE I AND III OF ABRAKA, DELTA STATE UNIVERSITY

Abstract

Geoelectric method and Geochemical analyses were implored to investigate the ground water potential in sites 1 and III of Delta State University, Abraka. Twenty (20) Vertical Electrical soundings (VES) with the aid of SAS 1000 Abem TERRAMETER were sounded using the Schlumberger configuration to determine the aquifer characteristics. The results reveal that most of the locations have four (4) layers except VES 8 which has five (5) layers. The result of the Lithostratigraphic study showed that the subsurface
formations from the top to bottom consist of topsoil, lateritic sand, and medium sand at the base with resistivity ranging from 300 Ωm to 2800 Ωm. The aquifer protective capacity and hydraulic conductivity were determined using Dar-Zarrouk parameters. It is observed that the transmissivity value was mostly highest in VES7 at the Northern part of the study area which
ranges from 160 to 440 m2/day but lower in the other VES points. Most part of the survey shows that the aquifer is confined and capable of yielding adequate and good quality water. The analysis of the ground water reveled that nitrate ranged from 0.49 Mg/l to 1.27 Mg/l, total dissolved solid ranged from 10 Mg/l to 200 Mg/l, Chloride ranged from 22.5 Mg/l to 38.2 Mg/l, Calcium ranged from 5.2 Mg/l to 6.1 Mg/l. Consequently, the analyses' findings show that the numbers fall within Nigeria's and the WHO's
standards. (WHO) for safe water. Hence, the water from the study area is good for human consumption and any other domestic usages