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- Aquifers 57
- Groundwater 43
- Watersheds 26
- Agriculture 16
- Water quality 15
- Hydrology 13
- Precipitation (Meteorology) 12
- Irrigation 11
- Water consumption 9
- Hydrogeology 8
- Politics and government 8
- Technology 6
- Wells 6
- Bureaucracy 5
- Contamination of environment 5
- Economics 4
- Finance 4
- Negev (Israel) 4
- Sandstone 4
- Brackish waters 3