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- Irrigation 10
- Hydrology 7
- Agriculture 6
- Soils 6
- Watersheds 6
- Groundwater 4
- Water consumption 4
- Water quality 4
- Precipitation (Meteorology) 3
- Water-power 3
- Water-supply 3
- Canals 2
- Drainage 2
- Salinity 2
- Water table 2
- Aquifers 1
- Bureaucracy 1
- Climate 1
- Cotton 1
- Crops 1