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- Climate 229
- Precipitation (Meteorology) 85
- Watersheds 72
- Agriculture 71
- Hydrology 69
- Irrigation 62
- Groundwater 47
- Economics 43
- Demography 37
- Water quality 33
- Politics and government 30
- Technology 29
- Water-supply 24
- Rain and rainfall 22
- Droughts 21
- Population 21
- Soils 20
- Water consumption 15
- Water-power 15
- Aquifers 12
