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- Hydrology 11
- Groundwater 5
- Irrigation 5
- Water-supply 5
- Agriculture 4
- Precipitation (Meteorology) 4
- Water consumption 4
- Watersheds 3
- Aquifers 2
- Evapotranspiration 2
- Hydrogeology 2
- Reservoirs 2
- Soils 2
- Water table 2
- Water-power 2
- Climate 1
- Dams 1
- Nasser, Lake (Egypt and Sudan) 1
- Rain and rainfall 1
