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Home  >  Volume 31 (July 2015)

Evaluation of Groundwater Potential Using Electrical Resistivity Method in Awo-Osun Community, Ile-Ife, Southwestern, Nigeria by Samuel Omosule Sedara and Olusegun Olalekan Alabi (pages 137 - 146)
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Abstract

 

Electrical Resistivity investigation was carried out in order to provide information on the subsurface layers and characterization of the overburden units to groundwater around a land fill in Awo-Osun, a community in Ile-Ife. The qualitative interpretation of the results identified areas of hydro-geologic importance and form basis for Vertical Electrical Sounding (VES) investigation. Thirteen (13) Vertical Electrical soundings (VES) were carried out across the area using the Schlumberger electrode array configuration, with half-current electrode separation (AB/2) varying from 1m to 100m.The Schlumberger configuration was used to delineate the subsurface geology of the study area. This configuration was used due to the fact that it is more suitable for depth sounding than the other configurations. In the survey, data were collected from thirteen (13) VES Stations located at different parts of the town. Partial curve matching with aid of maser curve and a computer as sited program were employed to obtain the various layer resistivities, thickness and depths. The sub-surface layer parameters obtained from partial curve matching served as start off point for the computer model program. Results show that the sub-surface of the study area consists of three, four and five layered structures. The ranges of resistivity of the layers are: for the first layer 16.5-1042.5Ωm, second layer 18.8-1560.4Ωm, and third layer 8.6-9868.5Ωm. The fourth layer constitute the groundwater aquifer which was determined to be confined by the third ubiquitous layer constituted by clays with thickness varying from 3.8 – 17.7 m and sandy clay/clayey sand of about 14.6 – 22.3m thick.

On the basis of geoelectric parameters (longitudinal conductance), the study area is zoned into good (s>0.5), intermediate(s<0.4) and poor (s<0.1) groundwater potential zones.

 

Keywords: Groundwater, electrical resistivity, conductance, subsurface layer.

 

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