[Tagging] Clearer definition of tunnel=flooded: when should it be used instead of tunnel=yes or tunnel=culvert?
Warin
61sundowner at gmail.com
Sun Mar 22 23:34:00 UTC 2020
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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