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Methodology  Analysis of existing Data
Over the past several decades, the Central Ground Water Board, State Ground Water and Drinking Water Supply Departments have been carrying out groundwater exploration, development and management studies for various purposes. A regional picture of the principal aquifer systems in the country and their characteristics is, in general, known. The present programme aims at advancing the knowledge at a large scale of 1:50,000 or more required for aquifer-based groundwater management at the watershed or village level.
The study commences with compilation and analysis of all the relevant data existing for the six pilot areas on groundwater as well as on surface water and preparation of a conceptual model. This is an important step. It helps identify the data gaps, in particular on sub-surface information and aquifer geometry, parameters, draft, water level, and water quality. It helps also plan activities.
The compilation is done by CGWB. A comprehensive database, including information on hydrology, geomorphology, geology, hydrogeology, borehole drilling, geophysical findings, hydrochemistry, groundwater use, groundwater contamination, and vulnerability to groundwater quantity and quality, is generated for all pilot project areas. Besides, a compiled digital map with relevant thematic layers is prepared by CGWB.