Asian Journal of Earth Sciences1819-18862152-3509Science International10.3923/ajes.2013.1.15NwosuL.I. NwankwoC.N. EkineA.S. 1201361Okigwe 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.]]>Akaolisa, C.C.Z. and A.O.I. Selemo,2009218188Chatterjee, A.K.,20057th Edn.,pp: 59-82pp: 59-82Ekine, A.S. and E.N. Iheonunekwu,200763948Ekine, A.S.,2010pp: 35-36pp: 35-36Ekwe, A.C., N.N. Onu and K.M. Onuoha,20066121131Fetter, C.W.,20072nd Edn.,pp: 161-550pp: 161-550Henker, C.J.,1985Version 0.92,Mbonu, P., J. Ebeniro, C. Ofoegbu and A. Ekine,199156284291Niwas, S. and D.C. Singhal,198150393399Nwosu, L.I., C.N. Nwankwo and A.S. Ekine,201024555Nwankwo, C., L. Nwosu and G. Emujakporue,201125771Olorunfemi, M.O., J.S. Ojo and O.M. Akintunde,199935207228Onyeaguocha, A.C.,198017147151Oseji, J.O., E.A. Atakpo and E.C. Okolie,20059157160Waterstaat, R.,1975Short, K.C. and J.A. Staeuble,19676761799Zhody, A.A.R.,196530644660