Malaysian Journal of Geosciences (MJG)

UTILIZING ELECTRICAL RESISTIVITY TECHNOLOGY AND BOREHOLE LOGGING FOR DETERMINATION OF GROUNDWATER POTENTIAL AND VULNERABILITY IN OGBA–NDONI–EGBEMA LOCAL GOVERNMENT AREA, RIVERS STATE, SOUTHERN NIGERIA

June 13, 2024 Posted by AqilZ In Malaysian Journal of Geosciences

ABSTRACT

UTILIZING ELECTRICAL RESISTIVITY TECHNOLOGY AND BOREHOLE LOGGING FOR DETERMINATION OF GROUNDWATER POTENTIAL AND VULNERABILITY IN OGBA–NDONI–EGBEMA LOCAL GOVERNMENT AREA, RIVERS STATE, SOUTHERN NIGERIA

Journal: Malaysian Journal of Geosciences (MJG)
Author: N.B. Osuamkpe, I. Tamunobereton-ari, A.R.C. Amakiri, J. Amoniah

This is an open access article distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

DOI: 10.26480/mjg.02.2024.142.149

Geoelectrical resistivity technology (GRT) was utilized to determine the potential and the protective capacity of the groundwater system in Ogba–Ndoni–Egbema Local Government Area (ONELGA) of Rivers State, Southern Nigeria. The deliverable of the research work was to determine groundwater potential zones and vulnerability by using vertical electrical sounding (VES) and borehole (BH) logs. GRT method applied Schlumberger 1-D vertical electrical sounding (VES). ABEM Terameter SAS 300 B resistivity meter was used to acquire 10 VES data while IPI2Win software tool was used to estimate the primary geo-electric indices. Lithostratigraphic analyses from two borehole (BH) logs further elucidate aquifer characteristics, facilitating the identification of desirable aquifer layers for groundwater storage and transmission. The best shallowest aquifer for the first BH log is fine to medium sand (whitish) with a thickness of 21m and ranges from 9m to 30 m. The aquifer in the second BH log is the whitish medium coarse sand, which is 9m thick and is situated between depths of 6 to 15m. Primary and secondary geoelectric parameters were employed to generate maps of hydrodynamic properties for the shallowest aquifer unit widely exploited in the region, enabling efficient groundwater management. The resistivity values for the most superficial aquifer varied between 265 and 919 Ωm and, the thickness of this layer ranged from 6.9 to 26.7 meters, with depths spanning from 8.6 to 43.3 meters. The findings revealed a range of potential index parameters such as transmissivity (2.366-5.734 m2/day), transverse resistance (1828.5-23576.1 Ωm2), and hydraulic conductivity (0.205-0.480 m/day), indicating favorable groundwater potential but inadequate protective capability, as indicated by the longitudinal conductance index (0.013109-0.030237 Siemens). Given the significant population residing in the local government due to its economic activities, it is recommended to implement well-managed waste disposal measures to prevent the infiltration of leachates as well as other organic and inorganic wastes into the naturally vulnerable underlying aquifer units.
Pages 142-149
Year 2024
Issue 2
Volume 8

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