The scope of the present study is broadly within the framework of National Aquifer Mapping and Management Programme (NAQUIM) being implemented by CGWB. There are four major activity components viz.: (i) data collection / compilation (ii) Data gap analysis (iii) Data generation and (iv) Preparation of aquifer maps and management plan to achieve the objectives. Data compilation included collection, and wherever required procurement, of all maps from concerned agencies, such as the Survey of India, Geological Survey of India, State Governments departments etc., computerization and analyses of all acquired data, and preparation of a knowledge base. Identification of Data Gap to ascertain requirement for further data generation in respect of hydrogeological, geophysical, chemical, hydrological, hydro meteorological studies, etc. Data generation included those of hydrometeorology, soil infiltration, sub-surface geophysics, chemical quality of ground water, lithologs and aquifer parameters. Generation of ground water chemical quality data was accomplished by collection of water samples and their laboratory analyses in CGWB for all major parameters, heavy metals, pesticides and bacteria. Sub-surface geophysical studies incorporated vertical electrical sounding, two-dimensional image profiling, and borehole logging. Additional data pertaining to sub-surface lithology and aquifer parameters were obtained through drilling of additional exploratory wells and slim holes, pumping tests at the drilling sites and slug tests in a number of sites and their analyses