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- Droughts 31
- Irrigation 15
- Precipitation (Meteorology) 14
- Politics and government 11
- Aswan High Dam (Egypt) 10
- Agriculture 9
- Climate 7
- Dams 7
- Bureaucracy 5
- Hydrology 5
- Nasser, Lake (Egypt and Sudan) 5
- Technology 5
- Water consumption 5
- Economics 4
- Groundwater 4
- Rain and rainfall 4
- Water-power 4
- Demography 3
- Erosion 3
- Famines 3
