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- Drainage 63
- Irrigation 38
- Agriculture 32
- Bureaucracy 15
- Canals 15
- Finance 13
- Building 9
- Water consumption 9
- Dams 8
- Hydrology 8
- Technology 7
- Water quality 7
- Reclamation of land 6
- Salinity 6
- Groundwater 5
- Economics 4
- Floods 4
- World Bank 4
- Arabah Valley (Israel and Jordan) 3
- Aswan High Dam (Egypt) 3
