Hi Dave, I agree about monsooon or snow melt. Regarding industrial operations involving downstream rivers, there are precise restrictions and perimeters may be publicly displayed like this https://imgur.com/a/TLhZcgE
Regarding this particular place : The stream https://www.openstreetmap.org/way/610040431 is dangerous at any time due to those canals https://www.openstreetmap.org/way/610040433 and https://www.openstreetmap.org/way/610040432 The canals are locked by automated gates which can send approximately 50 m3/s from the underground aqueduct once open when this plant https://www.openstreetmap.org/way/305700031 isn't in operation By a nice sunny summer day you may be highly tempted to go fishing in the stream down from the regulation canals. OSM is legit to warns you. All the best François *François Lacombe* fl dot infosreseaux At gmail dot com www.infos-reseaux.com @InfosReseaux <http://www.twitter.com/InfosReseaux> 2018-07-24 11:57 GMT+02:00 Dave F <davefoxfa...@btinternet.com>: > Hi > > This is another one of those discussion which comes up every year or so. > > The perception of danger is subjective; which never fits well within OSM. > > Waterways are not dangerous in themselves. They are inanimate objects. > They don't jump out & attack you as you walk by. It's the naive way people > interact with them which causes injury. > > If there's a sign indicating danger, tag that. > > Cheers > DaveF > > > On 23/07/2018 21:48, François Lacombe wrote: > > Hi, > > As the discussion about intermittent/seasonal/... on waterways goes on, > there is another thing to map: how waterways banks can be dangerous due to > sudden rise or lower water level. > It is actually related to what we intend to map with intermittent or > seasonal. > > For example in France, we often find such warning signs: > https://imgur.com/a/QUxuPem > > Precise sections of streams or rivers are marked as dangerous even in good > weather. > It is stronger than simple intermittence or seasonality because of > industrial activities running upstream (mainly hydroelectric power > generation or dam operation). > Nevertheless, I didn't find any global database or public information > displaying data about such particular flooding situations. OSM can be one > of this kind. > > Here is a public display next to a power plant in French Alps (with a nice > piece of OSM without attribution) > https://imgur.com/a/TLhZcgE > > Then what could be the best way to tag it? > No existing tag sounds suitable for this, even the idea of a single > "permanence" key. > > All the best > > François > > > _______________________________________________ > Tagging mailing > listTagging@openstreetmap.orghttps://lists.openstreetmap.org/listinfo/tagging > > >
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