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- Precipitation (Meteorology) 117
- Groundwater 47
- Agriculture 38
- Climate 34
- Irrigation 32
- Hydrology 29
- Rain and rainfall 25
- Watersheds 22
- Economics 21
- Aquifers 19
- Technology 18
- Water quality 15
- Droughts 13
- Water consumption 12
- Politics and government 11
- Bureaucracy 10
- Resource allocation 10
- Demography 9
- Arid regions 8
- Water-supply 8
