Abstract
Vertical Electrical Sounding (VES) surveys were carried out at Ajagba, Asa and Ikonifin communities in the north of Ola Oluwa local government area of Osun state, Nigeria in order to delineate the geoelectric layers in the area as well as evaluate the groundwater potential. The area is in the basement complex terrain of Nigeria where the occurrence of groundwater is highly unpredictable and hence requires the use of hydrologic, geophysical and geologic surveys to achieve success in groundwater development programs. The survey delineated a maximum of four geoelectric layers which may be interpreted to correspond to four geologic layers viz the topsoil, weathered basement, partly weathered/fractured basement and the fresh basement. The weathered basement and the partly weathered/fractured basement layers constitute the aquifer units. The partly weathered/fractured layer is significant in enhancing the ground water potential in this area because of its relatively low resistivity resulting from its high fracture frequency. The ground water potential in the area varies from medium to high. Groundwater development is therefore feasible in these communities.
Highlights
According to Deming (1975), more than 70% of the earth’s surface is covered by water
Groundwater obtained from wells, boreholes and springs may not undergo considerable treatment before becoming potable due to the natural filtration process it has undergone through the soil horizons (Abdullahi et al, 2005)
Because groundwater is widely known to be more hygienic than surface water, the possibility of utilizing it as a source of water supply for public use is always attractive (Abdullahi et al, 2005)
Summary
According to Deming (1975), more than 70% of the earth’s surface is covered by water. Groundwater has been defined as that portion of water beneath the surface of the Earth (Bouwer, 1978). Many communities in the world depend on groundwater extracted from weathered/fractured zones through water wells/boreholes (Clark, 1985; Olasehinde et al, 1998). Groundwater obtained from wells, boreholes and springs may not undergo considerable treatment before becoming potable due to the natural filtration process it has undergone through the soil horizons (Abdullahi et al, 2005). Because groundwater is widely known to be more hygienic than surface water, the possibility of utilizing it as a source of water supply for public use is always attractive (Abdullahi et al, 2005)
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