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- Agriculture 181
- Irrigation 152
- Groundwater 119
- Watersheds 95
- Politics and government 83
- Hydrology 78
- Water quality 74
- Technology 67
- Economics 62
- Demography 58
- Dams 57
- Precipitation (Meteorology) 57
- Water consumption 54
- Water-supply 44
- Bureaucracy 43
- Finance 38
- Soils 34
- Water-power 33
- Aquifers 31
- Economic development 30
