This approach has been successfully demonstrated by NRSC, through an R&D study in Moinabad mandal of Ranga Reddy district, Andhra Pradesh. In this study, 100% well inventory was conducted for entire mandal in terms of total number of wells of different type, number of hours of pumping for each well and the number of days of pumping, acreage and crops cultivated, etc., under each well during the same period. Spatial distribution of groundwater irrigated areas within the mandal was derived from satellite data. The potential of remote sensing data for groundwater draft estimation and identification of over-exploited zones has been presented to the Groundwater Resources Estimation Committee (CGWB, 1991). Based on the suggestion made by GEC (1996), a pilot study was taken up in Rolla mandal of Ananthapur district A.P. in collaboration with the State Groundwater Department, Govt. of A. P. and the potential of remote sensing for groundwater draft estimation has been established.