The National Aquifer Mapping and Management programme (NAQUIM) was launched by CGWB with the objectives of delineating aquifers, characterizing aquifers and preparing aquifer management plans. National level mapping of Aquifers on 1:50,000 scale was considered sufficient for planning requirements up to block level. The important uses of Aquifer mapping at 1:50,000 scale include identification of suitable areas for ground water based supply to large urban agglomerations, determine sustainability of groundwater development, identification of aquifers capable of providing water supply during protracted drought periods, prioritization of aquifers for managed aquifer recharge, identification of aquifers and determination of their suitability for various purposes in regions where new urban centres or industrial hubs are likely to come up in future, planning of integrated ground water recharge schemes, issuing advisories to the state agencies on repercussions of continued development of groundwater in select areas, recommendations to state agencies in respect of areas that have prospects for ground water development etc. The findings of NAQUIM studies are being utilized by many agencies, especially the State government agencies involved in ground water management and water supply, but large scale implementation of its recommendations at ground level by the user agencies has been lacking. Keeping the above limitations in mind and considering the future requirements, NAQUIM 2.0 is now taken up.