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- Irrigation 844
- Agriculture 409
- Hydrology 163
- Economics 155
- Politics and government 154
- Technology 146
- Groundwater 145
- Dams 126
- Finance 123
- Building 115
- Water quality 112
- Watersheds 101
- Bureaucracy 93
- Water-supply 92
- Water-power 85
- Demography 70
- Water consumption 66
- Resource allocation 61
- Precipitation (Meteorology) 60
- Canals 58
