Pakistan Journal of Geology (PJG)

Journal: Pakistan Journal of Geology (PJG)
Author: Adebo Babatunde A, Jemiriwon Emmanuel Tope and Ilugbo Stephen Olubusola

This is an open access journal distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

DOI: 10.2478/pjg-2021-0010

This research evaluates aquifer vulnerability within Lead City University Ibadan, Southwestern Nigeria. Multi-Criteria Evaluation Techniques were used for obtaining this aim, with the model which is based on hydraulic conductivity, longitudinal conductance, topsoil resistivity, and thickness of layer overlying aquifer of each sounding point within the entire investigated area for future groundwater development. Electrical Resistivity method using Vertical Electrical Sounding (VES) techniques was obtained across the investigated area using Schlumberger configuration. Twenty (20) VES data points were acquired using Omega Resistivity Meter with maximum current electrode separation (AB/2) of 65 m. The geoelectric results were used to determine second-order parameters and subsequently used to model different geoelectric maps. Three subsurface geoelectric layers were delineated across the investigated area which comprises topsoil, weathered layer, and fresh basement. In this research work, four different aquifer vulnerability parameters; Topsoil Resistivity (TSR), Longitudinal Conductance (LC), Thickness of Layer Overlying Aquifer (TLOA), and Hydraulic Conductivity (HC) were generated and integrated to model the aquifer vulnerability map. It was observed that a small closure at the southwestern and northeastern parts is indicative of a high aquifer vulnerability zone. Moderate aquifer vulnerability zone was observed at the northeastern, southwestern, and western parts of the study area, while low aquifer vulnerability zone was observed at the northern, southern, southeastern, southwestern, central, northeastern, and northwestern parts of the study area. Also, a very low aquifer vulnerability zone was observed in the southwestern part of the study area. The results obtained, indicates that the investigated area is an area of low aquifer vulnerability.