Abstract

Depleting water resources are becoming a significant challenge for India's Economic & social development. An exponential increase in per capita use of groundwater resources with significantly less recharge, creating a negative impact in terms of potential availability. For meeting such demand's new techniques should be adopted to locate fresh groundwater zones. Electrical Resistivity Tomography (ERT) is such a robust geophysical tool used nowadays for groundwater exploration purposes. In ERT, we use a multielectrode setup (act as source/receiver) to send the current inside the earth surface and measure the potential difference to calculate the apparent resistivity. Based on these resistivity values, we interpret different geological layers. If we get a high resistivity value of about 5000 ohm-m, it is due to the presence of hard basalt/granite rock; very low resistivity of 10 to 15 ohm-m infers the clay layer's existence. Using ERT, we can find different aquifer's zones where fresh groundwater is present. Such geophysical technique can be used for finding the recharge site (in terms of flow connectivity path), for estimating the potential groundwater reserve, for helping in the preparation of different water budget plans/policies.