APPLICATION OF ELECTRICAL RESISTIVITY METHOD[VERTICAL ELECTRICAL SOUNDING(VES)] FOR GROUNDWATER EXPLORATION IN ASABA AND ENVIRONS,NIGERIA

AUTHOR: TOLEFE, LINDA EKWIFE

DEPARTMENT: GEOLOGICAL SCIENCES

AFFILIATION: NNAMDI AZIKIWE UNIVERSITY, AWKA

This geophysical investigation of groundwater is aimed at delineating the aquiferous units in the central part of Asaba by determining their depths, thicknesses, resistivities and the potential borehole depth at various locations within the area employing the technique of Vertical Electric Sounding (VES) using the Schlumberger array. Nine sounding stations were obtained. Four to five geo-electric layers comprising the top soil, clayey sandstone, dry sandstone, saturated sandstone, and clay were delineated with the latter usually occurring as the last layer. The third and fourth layers underlying dry sandstone form the aquiferous unit. This unit was found to have an average resistivity value range of 314 – 2710Ωm and an average thickness of 25 m. It is deeply seated in some areas with an average depth of 6 – 132 m. Lithologic log for the borehole located near one of the sounding stations at Asaba revealed that some of the geologic units were either suppressed or merged into a single geoelectric unit probably due to similarities in electrical resistivity. The watertable map shows a southeast groundwater flow pattern in the area. It was observed that the hydraulic conductivity obtained ranges from 0.00048 to 0.0034 m/day while the transmissivity range is from 0.038 to 0.23m2/day within the study area. From the study, it is recommended that boreholes may be drilled to 6-132m, to harness potable water within the aquifer region.

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