Vertical Electrical Sounding Investigation for Delineation of Geoelectric Layers and Evaluation of Groundwater Potential in Ajagba, Asa and Ikonifin Localities of Ola Oluwa Local Government Area of Osun State, South Western Nigeria

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.

Groundwater Exploration Using Vertical Electrical Sounding And 2D Electrical Resistivity Tomography In Shale Formation: A Case Study Of Sabongida, Plateau State, North Central Nigeria

“…Ojo et al (2007) stated that the use of vertical electrical sounding (VES) technique has proven to be useful in achieving good lateral coverage for mapping aquifer units and drilling productive boreholes. (Onimisi et al, 2013) used electrical resistivity surveys to identify and locate good groundwater potential area. According to Igboekwe (2005) and Igboekwe et al (2006), vertical electrical sounding (VES) is a geophysical technique for determining subsurface geology.…”

Hydro geophysical Investigation for groundwater development at Gbongudu Area, Akobo Ojurin, Ibadan, Southwestern Nigeria

“…Electrical methods are generally classified according to the energy source involved, i.e., natural methods or artificial methods (Jatau et al, 2013). Electrical resistivity technique is an effective tool in delineating areas of good potential for groundwater development (Onimisi et al, 2013). In Vertical Electrical Sounding (VES) the goal is to observe the variation of resistivity with depth.…”