INVESTIGATION OF SUBSURFACE LITHOLOGY AND GROUNDWATER TRANSMISSIVITY IN DELTA STATE UNIVERSITY, ABRAKA NIGERIA USING VERTICAL ELECTRICAL SOUNDING AND DEEP WELL LOGS

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N. M Okoronkwo
E. C Okolie
J. E Okonkwo

Abstract

The subsurface lithology and groundwater distribution at Delta State University, Abraka were investigated using Vertical electrical sounding and deep well logs, with a view of delineating aquifer transmissivity and aquifer protective capacity using Dar-Zarrouk parameters within and around the location, Schlumberger electrode configuration was applied using ABEM Terrameter SAS 1000 AB. The resistivity of the lithologic layers was obtained, Brown lateritic Topsoil with resistivity range from 324 to 1092.5 Ωm and
thickness varying from 0.5 to 1.5 m was delineated, this was followed by reddish laterite of 181.1 to 701.9 Ωm and thickness from 1.2 to 3.8 m, fine sand with 453.5 to 1357.8 Ωm and thickness from 10 to 22.1 m, and the coarse grain sand also whitish with 655 to 13607 Ωm, then a layer of gravelly sand was obtained at a depth of 27.5 m to 40.9 m which is the aquifer. Transmissivity of the aquifer varies from 46.2 m2/day to 248.64 m2/day. The results show fair longitudinal conductivity due to the near absence of clay
formation. However, the depth to groundwater obtained in the analysis and subsequently correlated with available deep well records of 27.8 m to 39 m makes it safe for use due to progressive layer filtering. Also, the diagnostic parameter was evaluated, thus, the result reveals that the chance of groundwater is high and this area is fairly protected which is good for boreholes sinking due to the increase in transmissivity. Hence, the areas having high transmissivity are good and safe for productive deep well citing

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Okoronkwo, N. M., Okolie , E. C., & Okonkwo, J. E. (2023). INVESTIGATION OF SUBSURFACE LITHOLOGY AND GROUNDWATER TRANSMISSIVITY IN DELTA STATE UNIVERSITY, ABRAKA NIGERIA USING VERTICAL ELECTRICAL SOUNDING AND DEEP WELL LOGS. NIGERIAN JOURNAL OF SCIENCE AND ENVIRONMENT, 20(2). Retrieved from https://delsunjse.com/index.php/njse/article/view/103
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