On Sun, 22 Mar 2020 at 19:09, François Lacombe <fl.infosrese...@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. 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 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 Volker > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
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