[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
Tue Mar 24 23:03:56 UTC 2020


Hi all,

According to this discussion, I tried to update tunnel=flooded and
waterway=pressurised to make things more clear.

Feel free to improve if I made any mistake, examples list are always open
to add new situations if you find relevant ones.

All the best

François

Le lun. 23 mars 2020 à 01:30, Joseph Eisenberg <joseph.eisenberg at gmail.com>
a écrit :

> "To me 'tunnel=flooded' means that is cannot really be used for/by
> anything other than the fluid in it due to the very small amount of
> space left, if any. "
>
> Yes, that is what I would have guessed, too.
>
> I would have guessed that a canal tunnel which is passable by boats
> would be tunnel=yes, whether or not there is a side-path.
>
> (This is the problem with proposals that introduce several new tags
> all at once. I would have been better to discuss tunnel=flooded
> separately, so that this problem would not have occured.)
>
> -- Joseph Eisenberg
>
> On 3/23/20, Warin <61sundowner at gmail.com> wrote:
> > On 23/3/20 9:08 am, Volker Schmidt wrote:
> >>
> >>
> >> On Sun, 22 Mar 2020 at 19:09, François Lacombe
> >> <fl.infosreseaux at gmail.com <mailto:fl.infosreseaux at gmail.com>> wrote:
> >>
> >>     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.
> >
> >
> > Normal? No I don't think so. Some 'tunnels may be designed only to carry
> > water and have no real room for anything else.  I am thinking of hydo
> > schemes where tunnels are used
> >
> > To me 'tunnel=flooded' means that is cannot really be used for/by
> > anything other than the fluid in it due to the very small amount of
> > space left, if any.
> >
> > Humm ... a smaller description? '"tunnel=flooded' ... full or nearly
> > full of fluid so that the tunnel cannot be used for anything else' ???
> >
> >> Tag use tunnel=flooded: 2 in the UK,
> >> >> Many, if not the majority of the UK Inland Waterways canals have no
> >> tow-path.
> >> > 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
> >> <
> https://www.google.com/url?sa=i&url=https%3A%2F%2Ffr.wikipedia.org%2Fwiki%2FTunnel_de_Mauvages&psig=AOvVaw3UK-_RmcKBM_5fKTGMZyjW&ust=1584997257128000&source=images&cd=vfe&ved=0CA0QjhxqFwoTCOijlIn9rugCFQAAAAAdAAAAABAS
> >.
> >>
> >> 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 yourHydropower 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
> >>
> >> Volker
> >>
> >
> >
>
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