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- Climate 73
- Precipitation (Meteorology) 34
- Watersheds 26
- Agriculture 23
- Hydrology 21
- Groundwater 20
- Irrigation 18
- Rain and rainfall 13
- Technology 13
- Water consumption 11
- Water-supply 11
- Politics and government 10
- Water quality 10
- Aquifers 9
- Demography 8
- Droughts 7
- Economics 7
- Resource allocation 6
- Population 5
- Water-power 5