I concur that historic or heritage should be secondary tags.

Regarding man_made=qanat versus canal=qanat, it is worth pointing out that 
qanats surface and become surface canals for irrigation and distribution.  
Thus, it would be continuity to go from waterway=canal, canal=qanat, tunnel=yes 
to waterway=canal instead.  Thoughts?

>> On Jun 26, 2020, at 11:27, Paul Allen <[email protected]> wrote:
> 
>> On Fri, 26 Jun 2020 at 15:57, Walker Bradley <[email protected]> 
>> wrote:
> 
>> So it would seem that historic=* or heritage=* would be appropriate sub-tags 
>> for qanats when applicable on top of waterway=canal, canal=qanat, tunnel=yes.
> 
> That's how I see it.  Using historic=qanat for modern qanats seems wrong.  So
> if we need different tagging for modern qanats anyway, then handle historic
> qanats by adding historic=yes.
>> 
>> I guess we would need to discuss after the approval of Qanat for what 
>> criterion/ia would determine historic=yes for qanat.
> 
> See https://wiki.openstreetmap.org/wiki/Historic and then discuss if it needs
> modifying/expanding to specifically deal with qanats or if the page for
> man_made=qanat needs text clarifying what Historic means for qanats.
> 
> If a historian, even an amateur one, is eager to visit it then it's historic.
> If a historian takes a look and says "Meh" then it isn't historic.  Which
> isn't a very objective metric, so some would say the historic tag
> shouldn't be used at all (another good reason to prefer man_made=qanat)
> over historic=qanat).
> 
> -- 
> Paul
> 
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