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Topic
- Drainage 93
- Irrigation 57
- Agriculture 47
- Bureaucracy 17
- Finance 17
- Canals 16
- Hydrology 15
- Technology 12
- Water consumption 12
- Water quality 12
- Groundwater 11
- Salinity 11
- Building 10
- Dams 10
- Politics and government 9
- Soils 9
- Watersheds 9
- Reclamation of land 7
- Economics 5
- Floods 5
