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- Water-supply 65
- Building 16
- Bureaucracy 15
- Water quality 13
- Water consumption 12
- Groundwater 10
- Irrigation 10
- Hydrology 9
- Politics and government 9
- Sewage 8
- Water--Purification 8
- Finance 7
- Agriculture 6
- Economics 6
- Technology 6
- Dams 5
- Precipitation (Meteorology) 5
- Demography 4
- Drinking water 4
- Karkūk (Iraq) 4