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- Irrigation 140
- Agriculture 74
- Bureaucracy 30
- Dams 30
- Building 27
- Hydrology 27
- Water-power 23
- Groundwater 22
- Politics and government 22
- Economics 21
- Drainage 19
- Technology 18
- Finance 17
- Watersheds 17
- Water consumption 16
- Canals 15
- Reclamation of land 13
- Demography 12
- Climate 11
- Water quality 11