Determination of Groundwater Potential Using Vertical Electrical Sounding at Achina and Its Environs

Olisah Nzemeka C.¹ , Onyekaozuru Chinonso D.²

Section:Research Paper, Product Type: Journal-Paper
Vol.11 , Issue.2 , pp.15-25, Apr-2023

Online published on Apr 30, 2023

Copyright © Olisah Nzemeka C., Onyekaozuru Chinonso D. . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
The determination of groundwater potential was carried out in Achina and some neighouring towns in Aguata Local Government Area of Anambra State, Nigeria to investigate the depth of aquifer. A total of eight (8) Vertical Electrical Soundings was carried out in Achina and some neighbouring town with a VES done in each town. The ABEM SAS 1000 resistivity meter was used to acquire data in those areas and the data acquired was interpreted using the Schlumberger automatic INTERPEX analysis software, which generates model curve using initial layer parameters. The results obtained shows that VES 1, 3, 4 and 7 showed AQ type of curve, VES 2 and 5 curve types are KAQ and KQ respectively while VES 6 and 8 curve types are AHQ and HQ respectively as deduced from the resistivity values. The interpreted results were presented as VES 1 – 8 and were presented in terms of resistivity, thickness, depth and lithology. The lithology was inferred to the layers from a standard given by Davis & Annan (1989) and geology of the study area. VES 5 showed four (4) geoelectric layers; VES 1 and 8 showed a total of five (5) layers; VES 3, 4 and 7 showed a total of six (6) geoelectric layers while VES 2 and 6 showed seven (7) and eight (8) geoelectric layers respectively. The geoelectric layers delineated are Top sand, clay, sand, aquiferous sand and sandstone with aquiferous sand being the aquifer bearing unit, the depth of aquifers ranges from 161.3 m to 254.5 m and thickness ranging from 36.1 m to 196.9 m.

Key-Words / Index Term :
Achina, Aquifer, Schlumberger, Borehole, Geoelectric Section, Vertical Electrical Sounding, Ekwulobia

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