[Tagging] "Feature Proposal - RFC - Qanat"

Joseph Eisenberg joseph.eisenberg at gmail.com
Sat Jun 20 18:42:50 UTC 2020

> Most existing uses of man_made=qanat by the way are in combination with

Thank you for mentioning this. There are only 5 ways with man_made=qanat,
without waterway=* - https://overpass-turbo.eu/s/Viq

I will update the proposal page with this information.

So there is no debate about whether or not to tag these features with

We are deciding whether or not the additional tag should be man_made=qanat
or canal=qanat.

Since waterway=canal is currently used for all kinds of irrigation canals
and aqueducts, it makes sense to consider these irrigation features to be a
type of canal.

I have previously considered whether or not it might be sensible to create
a whole new value of waterway=* for aqueducts and irrigation canals, but
that does not seem to solve any particular problems: irrigation canals can
be as narrow as 20 cm or as wide as 20 meters, as can aqueducts used for
drinking water, so tagging usage=irrigation and width=*, while using the
existing main tag, is probably reasonable.

– Joseph Eisenberg

On Sat, Jun 20, 2020 at 5:17 AM Christoph Hormann <osm at imagico.de> wrote:

> I think this is a good idea.  Both in the sense of establishing a distinct
> tagging for it that does not engross qanats with other types of underground
> waterways and in the sense of using a non-English and non-European term
> where the most descriptive and clear term comes from a non-European
> language.  We have other cases of such tags in OSM but still in a proposal
> process which is dominantly discussed in English this is rare and kind of a
> litmus test for how culturally diverse tagging in OSM can be and if the
> cultural geography of non-European regions can be mapped in the
> classifications used locally just as we are used to doing it in Europe and
> North America.
> Most existing uses of man_made=qanat by the way are in combination with
> waterway=canal.
> --
> Christoph Hormann
> http://www.imagico.de/
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> Tagging at openstreetmap.org
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