[Tagging] Clearer definition of tunnel=flooded: when should it be used instead of tunnel=yes or tunnel=culvert?

François Lacombe fl.infosreseaux at gmail.com
Sun Mar 22 18:08:05 UTC 2020

Hi Volker,

Le dim. 22 mars 2020 à 18:35, Volker Schmidt <voschix at gmail.com> a écrit :

> Slippery terrain. In  the sense of definitions.
> Concerning the tunnel=flooded wiki page:
> The symbol shows free flowing water (air above the surface), wherea the
> first example is for a headrace where "no air can get inside" Why is this
> situation not tagged as pipeline? (see last row  in this table
> <https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dpipeline#Usage)>?)

The point of the symbol is to show water in the whole tunnel section,
independently of flowing regime.

To me a tunnel is different from a pipeline in regard of structure and
building technique.
Both tunnels and pipelines could have usage=headrace or usage=transmision

> The page states:
> ... tunnel <https://wiki.openstreetmap.org/wiki/Key:tunnel>=yes
> <https://wiki.openstreetmap.org/wiki/Tag:tunnel%3Dyes> where a path is
> usually intended for human to safely pass and where water level is usally
> controlled for safety reasons "
> I don't find areference to this implied meaning of tunnel=yes
> Many, if not the majority of the UK Inland Waterways canals have no
> towpath.

Then tunnel=flooded is more appropriate
This distinction has been determined to introduce tunnel=flooded.

> Other comments on the key "tunnel", referring to taginfo "tunnel="
> <https://taginfo.openstreetmap.org/search?q=tunnel%3D>:
> Absence of  "tunnel= *"  means: "this way is not in a tunnel of any type"
> "tunnel=yes" on a way means: "this way is in a tunnel of some type"
> It looks as if tunnel:type
> <https://taginfo.openstreetmap.org/keys/tunnel%3Atype> is practially not
> used
> We use instead tunnel= *
> <https://taginfo.openstreetmap.org/search?q=tunnel%3D> to indicate the
> type of tunnel.

:type suffix doesn't bring any additional information, indeed.

> This tagging is unfortunate, but in line with the (original) bridge
> approach
> tunnel=culvert is the most frequent value: 1208667 uses
> tunnel=flooded is rare in comparison; 2060 uses
> There is also 3337 instances of tunnel=covered, which, at least in Italy
> (140)  seem mainly tagging errors

Fully disposed to make any improvement to wiki according to those points.

All the best

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