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- Irrigation 130
- Agriculture 67
- Bureaucracy 29
- Dams 26
- Hydrology 25
- Building 24
- Groundwater 22
- Politics and government 22
- Economics 20
- Drainage 19
- Water-power 19
- Technology 16
- Watersheds 16
- Canals 15
- Finance 15
- Water consumption 14
- Demography 12
- Reclamation of land 12
- Climate 11
- Precipitation (Meteorology) 10