> On Jul 18, 2020, at 12:24 PM, Andy Townsend <ajt1...@gmail.com> wrote: > > On 18/07/2020 19:41, Alan Mackie wrote: >> >> >> On Sat, 18 Jul 2020 at 19:09, Paul Allen <pla16...@gmail.com> wrote: >> On Sat, 18 Jul 2020 at 18:53, Tod Fitch <t...@fitchfamily.org> wrote: >> >> What I’d like is one or two tags to indicate that all visible indications of >> a water way ends at this point and that the QA tools should not flag them as >> errors to be fixed. >> >> One of the things we need is an anti-spring. Marked on Ordnance Survey maps >> as a sink. We have natural=sinkhole but that seems only to apply to a large >> hole and/or depression. >> >> The closest I can find on the wiki is manhole=drain? sinkhole=ponor seems to >> be for natural-looking versions. >> > The "one that everyone* did in geography at school" is > https://www.openstreetmap.org/node/944314148/history > > That's currently tagged as "waterway=cave_of_debouchement”. >
The desert ones aren’t sink holes. Often the intermittent/ephemeral waterways spread out over the pediment [1] or alluvial fan [2] at the base of the mountains and simply dissipates. Not yet mapped, but if you look at the Bing Imagery for this area [3] you can see a well defined “wash” (local term for this type of waterway) coming from the hills/mountains to the west and fan out to nothing over the desert floor in a north easterly direction. [1] https://www.britannica.com/science/pediment-geology [2] https://en.wikipedia.org/wiki/Alluvial_fan#In_arid_climates [3] https://www.openstreetmap.org/#map=16/33.0877/-116.1253
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