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- Bureaucracy 19
- Irrigation 13
- Building 10
- Drainage 10
- Agriculture 8
- Reclamation of land 8
- Water-supply 8
- Canals 7
- Water consumption 7
- Water quality 7
- Economics 6
- Pipelines 6
- Karkūk (Iraq) 5
- Water--Purification 5
- Water--Storage 5
- Dams 4
- Finance 4
- Drinking water 3
- Mosul (Iraq) 3
- Filters and filtration 2