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- Dams 21
- Irrigation 10
- Agriculture 6
- Hydrology 6
- Watersheds 6
- Groundwater 5
- Politics and government 5
- Silt 5
- Finance 4
- Demography 3
- Economics 3
- Water-power 3
- Aswan High Dam (Egypt) 2
- Blue Nile River (Ethiopia and Sudan) 2
- Bureaucracy 2
- Canals 2
- Droughts 2
- Ecology 2
- Industries 2
- International regimes 2
