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- Irrigation 31
- Hydrology 25
- Agriculture 23
- Watersheds 18
- Precipitation (Meteorology) 12
- Water-supply 12
- Groundwater 9
- Water-power 9
- Water consumption 8
- Aquifers 7
- Soils 7
- Climate 6
- Dams 5
- Economics 5
- Geomorphology 5
- Hydrogeology 5
- Technology 5
- Canals 4
- Politics and government 4
- Water quality 4