I’ll make one up in the next few hours. I want to research wadis in other countries to make sure I’m not assuming my regional experience is misrepresenting the whole.
Javbw > On Jan 15, 2015, at 3:24 PM, Mateusz Konieczny <[email protected]> wrote: > > Can you consider making proposal for waterway=wadi on wiki? > Or maybe other tag, as waterway=wadi is frequently used to mark > intermittent streams? > > Currently http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dwadi > <http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dwadi> is > not mentioning anything like that. > > Note, I am not disputing usefulness of term wadi. I am disputing usefulness > of waterway=wadi tag due to lack on any agreed definition and description on > OSM wiki. > > 2015-01-15 3:41 GMT+01:00 johnw <[email protected] <mailto:[email protected]>>: > I strongly disagree. A wadi is usually only an active river through very rare > flash flood events, and almost never any other time. Entire biomes are > defined by the presence of (and situated in) a wadi. > > In america, the words Arroyo and wash roughly translate into wadi, and > because of the ambiguous nature of arroyo, the term wadi is used for a wash > or arroyo when referring to a usually dry stream/riverbed that is dangerous > in flash flood conditions. > > my experience with washes stems from the Southern California Desert, where > most of the state park would basically be covered in blue, if washes were > somehow labeled as rivers - some are 100m across. Whole road systems exist > in the washes (and are reestablished purely by use after a flood), as the > rest of the land is almost impassable. > > I have driven a couple thousand miles in a roughly 50x50 mile box over a > hundred or so driving trips, and only on 3 occasions was water ever present, > and at that time, the roads were completely impassable (a meter or so of > water filled up the Carrizo wash 30m wide). > > Although several famous arroyos (like the LA River) are now basically > man-made drainage ditches, mapping desert areas properly requires the wadi > tag, as they are different from intermittent rivers - in the fact that water > in the “bed" is *never expected* - even seasonally - and if present it is a > dangerous flash flood. There is never an in-between state of what you would > call “a river” for longer than a day. - as it disappears almost immediately > as soon as the flood is over (except in the most exceptional of weather > conditions). - kind of like an avalanche is only an avalanche while it is > moving, or an earthquake is is an event. > > A wadi is a place where flash floods occur. It is not an intermittent river - > it isn’t really seasonally wet, and doesn’t provide any real expectation that > water will be present (except deep underground) - because they are located in > places where rain itself is unexpected for most of the year. > > A wadi has an expectation of always being dry, except for the rare and > unpredictable flash flood. t and in that case, you should assume it is a > dangerous, and impassable place. > > I think, espcially since it is defined and used so heavily, and has a > different connotation than a river - even a intermittent one, it should be > kept. > > a wash near Borrego springs, CA (ironwood wash, Tubb canyon). it drains to a > sink in the middle of the desert (the white spot in the upper right) > > https://www.flickr.com/photos/javbw/11091366554/in/set-72157638113734675 > <https://www.flickr.com/photos/javbw/11091366554/in/set-72157638113734675> > > https://goo.gl/maps/fpSxE <https://goo.gl/maps/fpSxE> > > Javbw > > >> On Jan 14, 2015, at 11:45 PM, Mateusz Konieczny <[email protected] >> <mailto:[email protected]>> wrote: >> >> waterway=wadi is used (18 180 times) and has some support (for example JOSM >> and >> default map style). >> >> During implementing rendering of intermittent=yes I discovered major problem >> with this tag - >> the same waterway=wadi may be used for completely dried up waterway, >> intermittent stream, >> intermittent major river and intermittent ditch. >> >> Therefore - it seems that using waterway=river/canal/stream/ditch/drain + >> intermittent=yes is >> clearly superior to using waterway=wadi. >> _______________________________________________ >> Tagging mailing list >> [email protected] <mailto:[email protected]> >> https://lists.openstreetmap.org/listinfo/tagging >> <https://lists.openstreetmap.org/listinfo/tagging> > > > _______________________________________________ > Tagging mailing list > [email protected] <mailto:[email protected]> > https://lists.openstreetmap.org/listinfo/tagging > <https://lists.openstreetmap.org/listinfo/tagging> > > > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging
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