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Aquifer evaluation in southern parts of Nigeria from geo-electrical derived parameters

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Umayah S. O., Eyankware M. O.
World News of Natural Sciences
|
2022
|
vol. 42
28-43
EN
For the management of groundwater resources, understanding aquifer parameters is critical. The Vertical electrical sounding (VES) is considered one of the most common methods in groundwater exploration/aquifer vulnerability assessment. For the study, 15 VES survey was conducted using the Schlumberger configuration with a maximum electrode spacing of 200 m. The data were acquired using ABEM SAS 4000 Terrameter and processed using the WINRESIST program. The data collected were analyzed and interpreted in both qualitative and quantitative terms. Results obtained from the study area revealed that geoelectric layers range from 3 to 4, while the major kind of curve type that domain the study area is the H curve. The evaluation of aquifer protective capacity/groundwater potentials was based on the following parameters: Reflection Coefficient (Rc), Resistivity Contrast (Fc), Longitudinal Conductance (S), and Average Transverse Resistance (T). Result obtained from the study revealed that Rc, Fc, S, and T ranges from -0.70 to 0.95 with an average value of 0.10, 0.17 to 35.79 with an average value of 0.57, 822.26 to 32009.8 with an average value of 13908.8, and 0.001 Ω/m2 to 0.25 Ω/m2 with an average value of 0.063 Ω/m2 respectively. Deductions from Rc and Fc suggest that the study area showed good prospects for groundwater potential. Findings from S suggest that the study is vulnerable to surface contamination due to anthropogenic activities.
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