SURFACE GEOELCTRIC SURVEY FOR DELINEATING AQUIFER HORIZON FOR SITING STANDARD WATER WELLS IN WATER PROBLEM AREA OF IMO STATE, SOUTHEASTERN NIGERIA

L.I. Nwosu; C.N. Nwankwo

Volume : VI, Issue : X, October - 2016

SURFACE GEOELCTRIC SURVEY FOR DELINEATING AQUIFER HORIZON FOR SITING STANDARD WATER WELLS IN WATER PROBLEM AREA OF IMO STATE, SOUTHEASTERN NIGERIA

L. I. Nwosu, C. N. Nwankwo

Abstract :

20 vertical electrical soundings (VES) were carried out in Ikeduru Area of Imo State Nigeria to delineate the aquifer horizon and identify prospective areas for standard water well development, to solve the water problem that has long challenged the residents. The Schlumberger electrode array was used with maximum spread of 700m. Five of the sounding stations were sited near existing boreholes to enhance interpretation. The field data were analyzed using the Geosciences Incorporation 1D Software package. The result revealed multi–geoelectric layers with the resistivity of the aquiferous layer varying across the study area. The hydraulic conductivity values ranges from 15.90 to 191.80 while the transmissivity values are fairly uniform and quite high, characteristic of Coastal Plain Sands Formation. It ranges from 1093m2/day to 1097m2/day. Two interpretative geoelectric cross sections (IGCS) were constructed to delineate the aquifer horizon which is thick enough for drilling and development of standard water boreholes.