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

Volker Schmidt voschix at gmail.com
Sun Mar 22 17:33:59 UTC 2020

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

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.

Other comments on the key "tunnel", referring to taginfo "tunnel="

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
We use instead tunnel= *
<https://taginfo.openstreetmap.org/search?q=tunnel%3D> to indicate the type
of tunnel.
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



On Sun, 22 Mar 2020 at 01:04, Martin Koppenhoefer <dieterdreist at gmail.com>

> sent from a phone
> > On 22. Mar 2020, at 00:46, Joseph Eisenberg <joseph.eisenberg at gmail.com>
> wrote:
> >
> > How safe for walking does the tunnel have to be?
> waterways often will have quite different levels depending on the
> atmospheric conditions in the past days and weeks in the upstream area.
> When does it have to be safe? 99.9% of the year? At all times? 70%?
> Cheers Martin
> _______________________________________________
> Tagging mailing list
> Tagging at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/tagging

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