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- Water quality 48
- Hydrology 14
- Irrigation 13
- Water-supply 13
- Agriculture 12
- Water--Purification 12
- Economics 9
- Groundwater 8
- Bureaucracy 7
- Climate 7
- Sewage 7
- Water consumption 7
- Building 6
- Demography 6
- Politics and government 6
- Technology 6
- Watersheds 6
- Drinking water 5
- Karkūk (Iraq) 5
- Water--Storage 5