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- Climate 30
- Watersheds 15
- Hydrology 13
- Groundwater 11
- Precipitation (Meteorology) 10
- Agriculture 7
- Irrigation 7
- Politics and government 7
- Water quality 7
- Rain and rainfall 6
- Technology 6
- Water-supply 6
- Economics 5
- Population 5
- Aquifers 4
- Demography 4
- Soils 4
- Water consumption 4
- Contamination of environment 3
- Dead Sea (Israel and Jordan) 3
