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- Climate 211
- Precipitation (Meteorology) 83
- Agriculture 69
- Watersheds 66
- Hydrology 61
- Irrigation 59
- Groundwater 43
- Economics 38
- Demography 33
- Politics and government 29
- Water quality 28
- Technology 27
- Rain and rainfall 22
- Droughts 21
- Water-supply 21
- Soils 19
- Population 18
- Water consumption 15
- Water-power 13
- Aquifers 12
