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- Evapotranspiration 27
- Hydrology 15
- Irrigation 14
- Climate 12
- Agriculture 10
- Watersheds 9
- Groundwater 8
- Precipitation (Meteorology) 6
- Soils 5
- Aquifers 4
- Technology 4
- Building 3
- Droughts 3
- Salinity 3
- Water balance (Hydrology) 3
- Water quality 3
- Sudd (South Sudan) 2
- Water consumption 2
- Water-power 2
- Arid regions 1
