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- Irrigation 51
- Agriculture 29
- Hydrology 15
- Watersheds 11
- Precipitation (Meteorology) 10
- Dams 9
- Economics 8
- Groundwater 8
- Water-power 8
- Water-supply 7
- Building 5
- Climate 5
- Politics and government 5
- Water consumption 5
- Canals 4
- Demography 4
- Finance 4
- Soils 4
- Technology 4
- Water quality 4