<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">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. </div><div class=""><br class=""></div><div class="">Javbw</div><br class=""><div><blockquote type="cite" class=""><div class="">On Jan 15, 2015, at 3:24 PM, Mateusz Konieczny <<a href="mailto:matkoniecz@gmail.com" class="">matkoniecz@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class=""><div class=""><div class=""><div class="">Can you consider making proposal for waterway=wadi on wiki?<br class="">Or maybe other tag, as waterway=wadi is frequently used to mark <br class="">intermittent streams?<br class=""><br class=""></div>Currently <a href="http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dwadi" class="">http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dwadi</a> is<br class="">not mentioning anything like that.<br class=""><br class=""></div>Note, I am not disputing usefulness of term wadi. I am disputing usefulness<br class=""></div>of waterway=wadi tag due to lack on any agreed definition and description on<br class=""></div>OSM wiki.<br class=""></div><div class="gmail_extra"><br class=""><div class="gmail_quote">2015-01-15 3:41 GMT+01:00 johnw <span dir="ltr" class=""><<a href="mailto:johnw@mac.com" target="_blank" class="">johnw@mac.com</a>></span>:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word" class=""><div class="">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. </div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">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).</div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">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)</div><div class=""><br class=""></div><div class=""><a href="https://www.flickr.com/photos/javbw/11091366554/in/set-72157638113734675" target="_blank" class="">https://www.flickr.com/photos/javbw/11091366554/in/set-72157638113734675</a></div><div class=""><br class=""></div><div class=""><a href="https://goo.gl/maps/fpSxE" target="_blank" class="">https://goo.gl/maps/fpSxE</a></div><div class=""><br class=""></div><div class="">Javbw</div><div class=""><br class=""></div><br class=""><div class=""><blockquote type="cite" class=""><div class=""><div class="h5"><div class="">On Jan 14, 2015, at 11:45 PM, Mateusz Konieczny <<a href="mailto:matkoniecz@gmail.com" target="_blank" class="">matkoniecz@gmail.com</a>> wrote:</div><br class=""></div></div><div class=""><div class=""><div class="h5"><div dir="ltr" class=""><div class=""><div class=""><div class=""><div class="">waterway=wadi is used (18 180 times) and has some support (for example JOSM and <br class="">default map style).<br class=""><br class=""></div>During implementing rendering of intermittent=yes I discovered major problem with this tag -<br class=""></div>the same waterway=wadi may be used for completely dried up waterway, intermittent stream,<br class=""></div>intermittent major river and intermittent ditch.</div><br class=""><div class=""></div>Therefore - it seems that using waterway=river/canal/stream/ditch/drain + intermittent=yes is<br class="">clearly superior to using waterway=wadi.<br class=""></div></div></div><span class="">
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