ABSTRACT
Amongst all the geophysical methods, electrical resistivity has been used extensively in ground water exploration. It has addressed a variety of groundwater exploration and development issues in hard rock terrain the world over. In hard rock the method is used to identify the weathered zone, its thickness and groundwater yielding character, bed rock topography, saturated fractured zones and their depths, lateral extension and orientation, other structures like basic dykes and quartz reefs controlling groundwater movement and the quality of groundwater in terms of electrical conductivity. Also, it has been used to characterize the vadose zone for managed aquifer recharge and to monitor groundwater movement.
