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Home  >  Volume 26 (March 2014)

35. Ground water exploration and exploitation in parts of Abakaliki, Nigeria, using direct current resistivity method by Agha S.O. Volume26, (March, 2014), pp 267 – 272.
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Abstract

A geophysical exploration has been carried out with the objective of determining the depth to which ground water can be located and exploited in different parts of Abakaliki, Nigeria. Abakaliki is situated within latitudes 60 17′ - 6021N and longitudes 80 05 - 80 10E. It has an area of about 71km 2. The geophysical method used was the direct current resistivity method. The equipment utilized for data collection include ABEM terrameter (SAS 300C), four electrodes, hammer, four reels of wires, connecting cords, measuring tapes and global positioning system. The field layout used was schlumberger electrode array. The survey was carried out in three selected parts of Abakaliki which include the Metropolis, KpiriKpiri area and Nkaliki area. Vertical electrode sounding (VES) was also adopted to delineate the thickness of the underlying layers of the soil and the embodied rocks. From the result of the study, five geoelectrical layers were delineated in the Metropolis out of which the fourth layer from the earth’s surface with thickness of 30.8m and resistivity 176.17m and which was interpreted as fissile shale  bed had the best prospect for underground water development. The depth to this zone from the earth’s surface was 42.6m. According to the result, the fourth and fifth geoelectrical layers of KpiriKpiri area which were interpreted as wet splintery shale and wet pyritizedsilty  shale respectively both have the best prospect for underground water development in the area. The average depth to this zone of saturation was 46.0m and the average resistivity was 166.0m.

At Nkaliki area, out of the five layers delineated by the current in the survey, the fourth layer which was interpreted as well compacted but fissile shale bed has the best prospect for underground water development. The resistivity and thickness of this layer were 489.41m and 19.03m respectively. The depth to this layer from the surface was 35.28m. The results   show that there is very high probability of success for exploitation of underground water from the area.

Keywords:Resistivity,Geoelectric,Schlumberger, Overburden

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