CGWB India wells skills equity Mission country Training guidance economic Research Enhancing expertise Innovation principles Strategies key aspects consultants water levels stakeholders technologies water quality Aquifer Mapping sustainable use groundwater flow national policies local communities Capacity Building Atal Bhujal Yojana tender preparation various activities other organizations outsourced projects Outreach Activities contract management geophysical methods Technical Assistance Consultancy Services Exploratory Drilling scientific knowledge Aquifer Rejuvenation groundwater recharge Allegiance Enterprise groundwater potential Groundwater Modelling ecological efficiency Groundwater Regulation sustainable development Geophysical Exploration Technical Collaborations Allegiance Water Management Groundwater Level Monitoring CGWA NOC Consultancy Service subsurface water availability groundwater-bearing formations The Central Ground Water Board available groundwater resources Groundwater Resource Assessment Participatory Groundwater Management