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- Irrigation 33
- Hydrology 31
- Watersheds 29
- Agriculture 25
- Precipitation (Meteorology) 15
- Groundwater 14
- Water-supply 13
- Aquifers 12
- Water-power 12
- Dams 9
- Water consumption 8
- Hydrogeology 7
- Soils 7
- Climate 6
- Maps 6
- Canals 5
- Economics 5
- Geomorphology 5
- Technology 5
- Evapotranspiration 4