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Topic
- Bureaucracy 21
- Irrigation 14
- Building 10
- Drainage 10
- Agriculture 9
- Canals 8
- Reclamation of land 8
- Water-supply 8
- Water consumption 7
- Water quality 7
- Finance 5
- Pipelines 5
- Water--Purification 5
- Water--Storage 5
- Dams 4
- Drinking water 4
- Karkūk (Iraq) 4
- Economics 3
- Mosul (Iraq) 3
- Filters and filtration 2