I don't understand the logic of changing the meaning of a tag recently validated by a proposal without prior consultation. a natural siphon was before your modification a waterway=pressurised, now no more.
the fact that the approved proposal did not want to go into the details of speologies is not a sufficient argument. the fact that some contributors do not know if the whole underground part of the river is a syphon or not is not a sufficient argument either, in this case it is sufficient to use location=underground as proposed in the image of the propal. but if someone knows that a section is a pressurized siphon, it's a good thing he refine the info If a company installs a pipeline in a natural siphon, will it be necessary to invent a new waterway=* because the siphon was not designed by man ? it seems to me completely unrealistic as a condition to be verified for a contributor the addition of this restriction "artificially pressurized by man" seems to me to be very ambiguous. Continuing in this logic, we could even consider that man must have invented gravity or used pumps otherwise it is natural and therefore not appropriate. in short, as much as I appreciate the simplification of the description, the addition of the artificial screen seems to me to cause more problems than it solves. Besides, what is the problem that requires this modification ? if you want to prohibit natural siphons from waterway=pressurised, then make a new value propal I think however that a key that says how the pressure is obtained (gravity, pump,...) seems to me much better if you like it. Le 31.05.19 à 06:14, Joseph Eisenberg a écrit : > I've updated the language on the waterway=pressurised page to use > standard English syntax, and to clarify that these are artificial > tunnels or pipelines, in the short description. > > This was already somewhat clear from the full description, and from > the proposal where waterway=pressurised was described as "tag [for] > any pipe flow feature like water tunnels, penstocks and siphons where > water flows without any air. " > > New short description: > > "An artificial tunnel or pipeline where water flows in a closed space > without air" > > New long description: > > "This key is intended to map artificial conduits where water is found > pipe flowing in a closed space without air. As water is filling all > space available in the conduit, it applies a positive static pressure > on the conduit walls. > > "The conduit can be either a pipeline or a tunnel. This is specified > by adding man_made=pipeline or tunnel=* to the way tagged > waterway=pressurised." > > "A "pipe flow regime" is one of the three main flow regimes of liquid > water. This regime is obtained by design when the intake of the > conduit is built below the lowest water level the source can reach. > This is the only use case of waterway=pressurised."" > > I removed the reference to natural caves, because it conflicted with > the last paragraph which says "This regime is obtained by design when > the intake of the conduit is built below the lowest water level the > source can reach" - clearly natural caves are not designed or built in > the usual sense. > > The original proposal page had a brief mention of caves but said - > confusingly - that this usage was "out of scope" of the proposal: "it > may be useful for speleologists and natural underground rivers/siphons > out of this proposal scope." > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
