Electrical resistivity sounding and total magnetic field methods to determine the over burden depositand bed rock physical propertyfor ground water potential assessment a case study

The electrical resistivity sounding (VES) and magnetic profile methods are the most popular and the cheapest geophysical techniques. But the electrical resistivity sounding methods are more efficient for shallow deposit (sedimentary stratified layers) and not for the shallow and deeper volcanic rock horizon to delineate the bed rock due to erratic data and its electrical equivalence limitation. Here in this paper, It is attempted to show how magnetic profile could help the electrical resistivity sounding investigation. Electrical Resistivity Sounding and Total Magnetic Field Methods to determine the over burden deposit thickness and characterize bed rock physical property for ground water potential assessment. This approach can help to handle the bed rock geophysical property. To conduct investigation work on Gerado catchment: One magnetic profile crossing the catchment SE to NW direction which has 1820m profile length with 50m spacing and three electrical resistivity soundings with AB[m] = 1500m by using Schlumberger configuration had been carried out at the selected three stations on the magnetic profile. All VES data analysis, interpretation, 1D and 2D geo-electrical cross-section models of subsurface had been processed, determined and generated by using IPI2win and IX1D for electrical resistivity, Potent for magnetic modeling to fix top depth and to get a good picture of the bed rock under subsurface.