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Topic
- Irrigation 32
- Hydrology 29
- Watersheds 28
- Agriculture 24
- Groundwater 14
- Aquifers 13
- Precipitation (Meteorology) 12
- Water-power 12
- Water-supply 12
- Dams 9
- Water consumption 8
- Hydrogeology 7
- Soils 7
- Canals 5
- Climate 5
- Economics 5
- Geomorphology 5
- Maps 5
- Technology 5
- Evapotranspiration 4