[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 22:08:35 UTC 2020

On Sun, 22 Mar 2020 at 19:09, Fran├žois Lacombe <fl.infosreseaux at gmail.com>

> Hi Volker,
> ...
> Fully disposed to make any improvement to wiki according to those points.

Thanks, Francois.

There is possibly a language bias (error?) in the use of tunnel=flooded.
I am not a native speaker, but "flooded" to me means at least "more water
than normal", and from this discussion it seems that we are talking about
the normal presence of water in these structures.
Tag use tunnel=flooded: 2 in the UK,
>> Many, if not the majority of the UK Inland Waterways canals have no
> Then tunnel=flooded is more appropriate.
No, definitely not. These tunnels are not "flooded" at all, the water level
in them is carefully controlled
(The original method of powering the boats in these canals were men laying
on their back and "walking" with their feet upwards along the tunnel
ceiling. The French canals, being constructed later, generally did have
tow-paths also in the tunnels see for example the Tunnel_de_Mauvages
I remember when I was a boy my father showed me the tractors pulling the
ships through the old tunnel near Arzwiller in Alsace on the same canal)
They are uniformly tagged (correctly) as waterway=canal and tunnel=yes.
I mentioned them in the context that tunnel=yes does not imply a tow-path.

I had glanced at your Hydropower water supplies proposal, but I think I
failed to intervene on three  specific points:

   1. The first one are the inverted siphons (botte sifone
   <https://it.wikipedia.org/wiki/Botte_sifone>, pont-siphon
   <https://fr.wikipedia.org/wiki/Pont-siphon>), which are
   gravity-pressurised always-water-filled sections of non-navigable canals. I
   usually map them as culverts, and i have just started to add the new tag
   culvert=inverted_siphon to the first three of them.
   2. The second point is that the distinction between water-filled and
   part-filled water conducts is problematic: culverts that are frequently
   used to conduct free-flowing drains, ditches, irrigation canals, freshwater
   canals under roads can be anything from empry to fully filled (and slightly
   pressurised) depending on precipitations.
   3. waterway=pressurised cannot be used together with waterway=canal for
   the inverted-siphon situation


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