[Tagging] "Feature Proposal - RFC - Qanat"

Joseph Eisenberg joseph.eisenberg at gmail.com
Fri Jun 19 21:13:02 UTC 2020


> What about historic=aqueduct

The tag historic=aqueduct can be used, since it appears to be used for
underground aqueduct segments (as well as the more common above-ground
segments). It is briefly mentioned on the proposal page, but it is not part
of this proposal since it is an already accepted tag.

The tag will be used for currently functional canals. Generally these
features require occasional maintenance: while many were built decades ago,
the local villages maintain the knowledge and skills necessary to repair
and build these features. Brand-new qanat canals are rarely built since
powered pumps and pipelines are often cheaper to install.

> [Explain] what the criteria for the tag are (is this for all kinds of
underground aqueducts “in hot and arid” climate or are there specific
requirements for the term?)

As mentioned on the proposal page, there are 4 criteria, which all qanat
features share:


   - The immediate source of water is groundwater (aquifer or well), not a
   spring, stream or river
   - Water flows by gravity in free flow (not pressurized or pipe flow)
   - The channel is underground, minimising evaporation
   - Construction and maintenance is through vertical shafts, which are
   then visible on the surface


The short definition of the tag will be "A gently-sloping man-made
underground channel for transporting groundwater via gravity, with shafts
visible from the surface."

As mentioned on Wikipedia, these kinds of aqueducts/canals are also found
around the Mediterranean, as far as Spain, and from there they were also
brought to the Americas. But they are most commonly found in North Africa,
West Asia and Central Asia:
https://en.wikipedia.org/wiki/Qanat#/media/File:Qanat_technology_diffusion.svg


– Joseph Eisenberg

On Fri, Jun 19, 2020 at 1:42 PM Martin Koppenhoefer <dieterdreist at gmail.com>
wrote:

> What about historic=aqueduct
> should it be applied as well, in case of historic qanats?
>
>
> Cheers Martin
>
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