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 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 <jo...@mac.com>: > 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://goo.gl/maps/fpSxE > > Javbw > > > On Jan 14, 2015, at 11:45 PM, Mateusz Konieczny <matkoni...@gmail.com> > 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 > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > >
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