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- Precipitation (Meteorology) 24
- Agriculture 10
- Droughts 10
- Aswan High Dam (Egypt) 8
- Irrigation 8
- Politics and government 8
- Rain and rainfall 6
- Climate 5
- Demography 5
- Economics 5
- Groundwater 5
- Hydrology 5
- Water-power 5
- Nasser, Lake (Egypt and Sudan) 4
- Water levels 4
- Water quality 4
- Bureaucracy 3
- Dams 3
- Resource allocation 3
- Rivers 3