> Not sure about small rock-cut waterways with massive impermeable sides, are > these ditches or canals or drains?
We don't have these in the western USA, but generally our ditches are dug out of the soil, so I would be surprised to see a feature tagged as waterway=ditch if it were cut from bedrock or lined with stone. I'd think waterway=canal would be appropriate for these if they are large enough. One tag that's already used is canal=qanat for "a gently sloping underground channel or tunnel constructed to lead water from the interior of a hill to a village below", found in the Middle East If there are small irrigation waterways that area lined with stone (or concrete etc), we probably need a new tag, since waterway=drain is pretty strongly associated with drainage, not irrigation, and waterway=canal probably has a minimum width? On 5/29/19, Martin Koppenhoefer <[email protected]> wrote: > > > sent from a phone > >> On 29. May 2019, at 03:37, Joseph Eisenberg <[email protected]> >> wrote: >> >> What, then, should be the distinguishing characteristic between >> waterway=canal and waterway=ditch or =drain? Width or importance or >> navigability, or should we still mention the usage as the main >> difference? > > > IIRR ditches were seen without construction like steel or concrete, just a > man made depression to channel water, while drains are required to have > their borders (and maybe base) constructed. > > Not sure about small rock-cut waterways with massive impermeable sides, are > these ditches or canals or drains? > > Stating the usage explicitly might help interpretation of the data, or while > we’re still mapping fragments of an incomplete network, although I would > have guessed with a more mature mapping this could already be seen from > looking at the network structure and flow directions? > > What about the practical, human scale distinction we use for natural > waterways (can be jumped over), wouldn’t it be equally interesting for man > made waterways? > Is a canal you can jump over still a canal, or does size somehow come into > the equation? Can there be draining canals, or are these always drains? > > Cheers, Martin > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging > _______________________________________________ Tagging mailing list [email protected] https://lists.openstreetmap.org/listinfo/tagging
