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. ^_^
Javbw > On Jan 16, 2015, at 9:27 AM, Eugene Alvin Villar <[email protected]> wrote: > > 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. ;-) > > On Fri, Jan 16, 2015 at 7:27 AM, John F. Eldredge <[email protected] > <mailto:[email protected]>> wrote: > 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. > > -- > John F. Eldredge -- [email protected] <mailto:[email protected]> > "Darkness cannot drive out darkness; only light can do that. Hate cannot > drive out hate; only love can do that." -- Martin Luther King, Jr. > > > > > On January 15, 2015 3:13:38 AM Christoph Hormann <[email protected] > <mailto:[email protected]>> wrote: > > On Thursday 15 January 2015, johnw wrote: > > > > 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. > > Well - that would be a useful concept of a wadi but it has two problems: > > * current use of the tag is very different from that, you can see that > quite well when you look at the taginfo map: > > https://taginfo.openstreetmap.org/tags/waterway=wadi#map > <https://taginfo.openstreetmap.org/tags/waterway=wadi#map> > > the uses in Europe for example are probably almost always seasonal. > > * sporadic waterflow is very difficult to determine for the mapper. > This is especially true for northern Africa where climate got a lot > drier in the last few thousand years and as a result there are many > permanently dry valleys that still look like being formed by waterflow > but that have not seen significant waterflow in the last hundred years. > > My suggestion would probably be to stop rendering waterway=wadi in a way > implying waterflow, encourage mappers to use intermittent/seasonal > where this is known and reserve waterway=wadi - despite the then > misleading key - for valleys where waterflow is unknown. > > -- > Christoph Hormann > http://www.imagico.de/ <http://www.imagico.de/> > > _______________________________________________ > 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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