Tag:canal=qanat

canal = 
Description
A gently sloping underground waterway that transports water downhill from an aquifer or well. Show/edit corresponding data item.
Group: waterways
Used on these elements
should not be used on nodesmay be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
Requires
Useful combination
See also
Status: de factoPage for proposal
More details at taginfo
Tools for this tag

canal= is used with waterway=canal and tunnel=yes to specify a qanat, also known as a faraj, khettara, kariz or kanez - a gently sloping underground channel used to transport water downhill from an aquifer or water well to the surface, commonly found in the Middle East and surrounding arid areas near hills or mountains.

A qanat is usually built with vertical ventilation shafts along it's course, which can be used to verify the route of the underground waterway. These have been mapped as nodes with the tag excavation=qanat_shaft

For more details on this tagging scheme, see Proposed features/Qanat.

Quanat diagram
Quanats - both mapped and unmapped ones
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