On Thu, 8 Jun 2017 15:40:23 +0200 Volker Schmidt <vosc...@gmail.com> wrote:
> I am looking into how to tag a frequent feature in my area, i.e. a > siphon underpass, known in Italian as "botte a sifone" or "botte > sifone" and in French as "pont siphon". This is a non.connecting > waterway crossing where the lower waterway passes through a U-shaped > siphon. The bottom part of the U is a tunnel that is lower as the > normal level of the waterway. Up to now I have mapped them as tunnel= > yes, and more recently as tunnel=culvert, but they are so frequent, > and different from a culvert, that I would like to start tagging them > with tunnel=siphon_underpass. They are also used to pass > non-navigable waterways under roads and other obstacles. > There are hundreds or more in Northern Italy and I presume in other > flat parts of the world where there are many artificial waterways. I > remember to have seen them on drinking_water canals in California, > but don't remember where. > > I could not find any tagging schemes for this in OSM, but I may have > missed them in ignorance of the proper technical terms. > > A locally famous example dates from the 16. century: il ponte canale > Montaigne: > http://osm.org/go/0IA2uooQI?m= The English term appears to be "siphon" (or "inverted siphon" if you're being pedantic). It's not always flat land, either: the Bacon Siphon[1] carries the Columbia Basin Project's main irrigation canal across a small canyon. -- Mark [1]: http://digital.lib.uidaho.edu/cdm/ref/collection/crbproj/id/1039 _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
