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Asian Journal of Earth Sciences
  Year: 2013 | Volume: 6 | Issue: 1 | Page No.: 1-15
DOI: 10.3923/ajes.2013.1.15
 
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Geoelectric Investigation of the Hydraulic Properties of the Aquiferous Zones for Evaluation of Groundwater Potentials in the Complex Geological Area of Imo State, Nigeria

L.I. Nwosu, C.N. Nwankwo and A.S. Ekine

Abstract:
Okigwe district is in the complex geological environment of Imo State and lies between latitude 5°30-5°57/N and longitude 7°04-7°26/E. It covers a land area of about 1,824 km2. Water is becoming scarce in the area owing to increasing demand and deteriorating quality due to pollution. This is compounded by the gradual increase in the rate of industrial and commercial activities and the cases of borehole failure in some parts of the area. This study therefore aimed at delineating sites for productive boreholes. To achieve this, 120 Vertical Electrical Soundings (VES) were sited within the study area. The ABEM terrameter was used to acquire data using the Schlumberger electrode array and a maximum current electrode spread of 900 m. Twelve of the VES Stations were sited near existing boreholes to enhance interpretation. The resistivity of the aquiferous zones varied from 33.1 Ωm obtained in the Northern part to 32600 Ωm recorded in the Southern area. The aquifer thickness is low in the Northern part but high in the Southern part reaching a maximum of 104.4 m recorded at Otoko. Using an average transmissivity of 1032.0848 m2 day-1 determined from pumping test, a mean conductance value of 91.222 m day-1 was obtained for the area. Hydraulic conductivity varied from 9.8854-115.9646 m day-1 while transmissivity ranged from 992.04-10263.65 m3 day-1. With these results and the distribution of storativity and specific capacity values, the Southern and Northeastern parts of the district are promising for sitting boreholes with high yield expectation.
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How to cite this article:

L.I. Nwosu, C.N. Nwankwo and A.S. Ekine, 2013. Geoelectric Investigation of the Hydraulic Properties of the Aquiferous Zones for Evaluation of Groundwater Potentials in the Complex Geological Area of Imo State, Nigeria. Asian Journal of Earth Sciences, 6: 1-15.

DOI: 10.3923/ajes.2013.1.15

URL: https://scialert.net/abstract/?doi=ajes.2013.1.15

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