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- Irrigation 92
- Agriculture 59
- Bureaucracy 40
- Dams 18
- Finance 16
- Politics and government 16
- Water consumption 15
- Groundwater 14
- Reclamation of land 9
- Drainage 8
- Pipelines 8
- Water quality 8
- Canals 7
- Hydrology 7
- Droughts 6
- Economics 6
- Technology 6
- Wells 6
- Building 5
- Food 5