An Investigation of Groundwater Potential and Aquifer Protective Capacity at Aguleri and Nando, Anambra State

Olisah Nzemeka C.¹ , Modu Franklin C.² , Nwobodo Anthonia³

Section:Research Paper, Product Type: Journal-Paper
Vol.11 , Issue.4 , pp.38-45, Aug-2023

Online published on Aug 31, 2023

Copyright © Olisah Nzemeka C., Modu Franklin C., Nwobodo Anthonia . 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 :
A geophysical survey using electrical resistivity method was conducted at Aguleri and Nando town in Anambra East LGA, Anambra State, Nigeria to investigate the groundwater potential and aquifer protective capacity. The project area lies within Latitude: 06°17`N - 06°20`N and Longitude: 006°51`E - 006°54`E. Vertical Electrical Sounding (VES) was carried out with a digital readout resistivity meter (ABEM SAS 1000). The VES data interpretations were done using INTERPEX software and the VES results were presented in terms of resistivity, thickness, depth and lithology. The lithology was inferred to the layers by correlating the lithology log of one of the boreholes drilled in each of the study areas and the geology of the study area. The VES result shows lithologic layers varying from 4 - 6 with the subsurface sequence varying as follows: red earth, shaly sand, shale, sandstone and water saturated sand. The water saturated sand layers constituted the aquifer unit in the area. The aquifer protective capacity was determined by calculating for longitudinal conductance and matching the values to known standards ranging from poor (< 0.1 mhos) to excellent (>10 mhos). The longitudinal conductance was computed to be ranging from 0.1889 – 6.293 mhos. The interpreted VES result also shows that VES 1 – 3 has good, weak and very good aquifer protective capacity of the overburden layers respectively.

Key-Words / Index Term :
aquifer, aquiferous zone, geoelectric section, vertical electrical sounding, Nando, Aguleri

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