groundwater Groundwater resources 12 Aquifers 10 Groundwater 7 Hydrogeology 7 Recharging (underground waters) 5 GIS 4 aquifer 4 Geographic information systems 3 Groundwater potentials 3 Land use 3 Landforms 3 Rain 3 Remote sensing 3 Surface waters 3 Water levels 3 Water quality 3 rainfall 3 remote sensing 3 surface water 3 water quality 3 water table 3 Abstracting 2 Agriculture 2 Budget control 2 Case-studies 2 China 2 Decision making 2 Digital storage 2 Discharge (fluid mechanics) 2