INTEGRATED ELECTRICAL RESISTIVITY TOMOGRAPHY (ERT) AND HYDROCHEMICAL MODELING OF AQUIFERS IN OYO STATE Abstract Oyo State faces escalating groundwater management challenges driven by rapid urbanisation, increasing contamination risks from landfills and septic systems, and insufficient hydrogeological characterisation of its basement complex aquifer systems. This study integrates two-dimensional Electrical Resistivity Tomography (ERT) and hydrochemical modelling to […]