Ground water 24 Hydrology 10 Earth science 9 Geology 9 Hydrogeology 8 Groundwater 6 Underground water 6 Ground Water 5 General Hydrology 4 Ground water management 4 Irrigation 4 Science 4 Soil pollution 4 Water 4 Water management 4 ground water 4 GROUND WATER 3 Geomorphology 3 Ground water pollution 3 Soil remediation 3 Water pollution 3 crops - water requirements 3 ground water - crop growth 3 tube wells 3 Aerial photography 2 Aquifer properties 2 Biogeochemistry 2 Climate 2 ENVIRONMENTAL IMPACT; 2 Geochemistry 2