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International Journal of Basic Science and Technology

A publication of the Faculty of Science, Federal University Otuoke, Bayelsa State

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Archive | ISSUE: , Volume: Oct-Dec-2021

Investigation of Groundwater Aquifers in Otuoke and its Environs Using Vertical Electrical Sounding (VES) Technique


Author:Adejumo, P.P; Onyebueke E. O,; Nwori A. N.;Okeke,

published date:2021-Nov-30

FULL TEXT in - | page 156 - 168

Abstract

The investigative surveys for groundwater aquifers thickness and depths in parts of Otuoke community in Bayelsa state Nigeria for the sinking of boreholes were carried out using the geoelectric method in this work. These surveys involving vertical electrical sounding (VES), was carried in seventeen locations in the area by utilizing Schlumberger electrode configuration with a maximum current electrode spacing of 350 m and minimum current electrode distance of 100 m (min. AB/2 = 50 m) to determine the apparent electrical resistivity of the subsurface layers. The field electrical resistivity sounding surveys were carried out in these locations with adaptive boundary element method (ABEM) Terrameter (Signal Averaging System) SAS (1000). The field data obtained were interpreted using Win Resist and IpI2win Computer software. The interpreted results showed that water-saturated sandstone forms the major aquifers in the study area and geoelectric survey/analysis indicates that three to four geoelectric layers are present down to the depth of investigation. The electrical resistivity arrangement of these layers in the area is an A-type curve for two VES stations, a K-type curve for five VES stations, two KH-type curves, and seven HK-type curves. The depth of aquifers in the study area is in the range of 20 m to 90 m. The results of our investigation revealed that the majority of the VES stations intercepted good aquifer zones for portable groundwater development in the area with just a few stations showing a decline to good aquifers for groundwater exploration

Keywords: Apparent-resistivity, Schlumberger-array Groundwater, Vertical- Electrical-Sounding, Aqui,

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FULL TEXT in - | page 156 - 168

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