<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="">That’s all of San Diego - the storm drain system is so anemic - I’ve hydroplaned my car down the freeway (“Surfing interstate 5”), and forded a few “intermittent” rivers before I moved to Japan. here in Japan, torrential rain is really a non-issue most of the time - whereas a few cm of rain in Southern California means death on the roads and flooding underpasses. maybe it’s all the bald tires, oily roads, and people going 30-40km/h over what they should be driving. One wonders. ^_^</div><div class=""><br class=""></div><div class="">Javbw</div><br class=""><div><blockquote type="cite" class=""><div class="">On Jan 16, 2015, at 9:27 AM, Eugene Alvin Villar <<a href="mailto:seav80@gmail.com" class="">seav80@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Given the current discussion, I wonder if roads that are usually flooded during heavy rainfall should be also be tagged as waterway=river/stream and intermittent=yes. ;-)<br class=""></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Fri, Jan 16, 2015 at 7:27 AM, John F. Eldredge <span dir="ltr" class=""><<a href="mailto:john@jfeldredge.com" target="_blank" class="">john@jfeldredge.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I would recommend expanding the definition of "intermittent streams" to include not only streams that have a regular, seasonal water flow but also streams in desert areas that exist only when a rare storm comes along. The topography is the same, the tendency of water to run downhill is the same, only the frequency of rainfall is different.<span class="HOEnZb"><font color="#888888" class=""><br class="">
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-- <br class="">
John F. Eldredge -- <a href="mailto:john@jfeldredge.com" target="_blank" class="">john@jfeldredge.com</a><br class="">
"Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that." -- Martin Luther King, Jr.</font></span><div class="HOEnZb"><div class="h5"><br class="">
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On January 15, 2015 3:13:38 AM Christoph Hormann <<a href="mailto:chris_hormann@gmx.de" target="_blank" class="">chris_hormann@gmx.de</a>> wrote:<br class="">
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<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On Thursday 15 January 2015, johnw wrote:<br class="">
><br class="">
> A wadi is a place where flash floods occur. It is not an intermittent<br class="">
> river - it isn’t really seasonally wet, and doesn’t provide any real<br class="">
> expectation that water will be present (except deep underground) -<br class="">
> because they are located in places where rain itself is unexpected<br class="">
> for most of the year.<br class="">
<br class="">
Well - that would be a useful concept of a wadi but it has two problems:<br class="">
<br class="">
* current use of the tag is very different from that, you can see that<br class="">
quite well when you look at the taginfo map:<br class="">
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<a href="https://taginfo.openstreetmap.org/tags/waterway=wadi#map" target="_blank" class="">https://taginfo.openstreetmap.<u class=""></u>org/tags/waterway=wadi#map</a><br class="">
<br class="">
the uses in Europe for example are probably almost always seasonal.<br class="">
<br class="">
* sporadic waterflow is very difficult to determine for the mapper.<br class="">
This is especially true for northern Africa where climate got a lot<br class="">
drier in the last few thousand years and as a result there are many<br class="">
permanently dry valleys that still look like being formed by waterflow<br class="">
but that have not seen significant waterflow in the last hundred years.<br class="">
<br class="">
My suggestion would probably be to stop rendering waterway=wadi in a way<br class="">
implying waterflow, encourage mappers to use intermittent/seasonal<br class="">
where this is known and reserve waterway=wadi - despite the then<br class="">
misleading key - for valleys where waterflow is unknown.<br class="">
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--<br class="">
Christoph Hormann<br class="">
<a href="http://www.imagico.de/" target="_blank" class="">http://www.imagico.de/</a><br class="">
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