<div dir="ltr"><div>Hi Dave,</div><div><br></div><div>I agree about monsooon or snow melt.</div><div>Regarding industrial operations involving downstream rivers, there are precise restrictions and perimeters may be publicly displayed like this</div><div><a href="https://imgur.com/a/TLhZcgE">https://imgur.com/a/TLhZcgE</a></div><div><br></div><div>Regarding this particular place : <br></div><div>The stream <a href="https://www.openstreetmap.org/way/610040431">https://www.openstreetmap.org/way/610040431</a> is dangerous at any time due to those canals <a href="https://www.openstreetmap.org/way/610040433">https://www.openstreetmap.org/way/610040433</a> and <a href="https://www.openstreetmap.org/way/610040432">https://www.openstreetmap.org/way/610040432</a></div><div>The canals are locked by automated gates which can send approximately 50 m3/s from the underground aqueduct once open when this plant <a href="https://www.openstreetmap.org/way/305700031">https://www.openstreetmap.org/way/305700031</a> isn't in operation</div><div><br></div><div>By a nice sunny summer day you may be highly tempted to go fishing in the stream down from the regulation canals.</div><div>OSM is legit to warns you.</div><div><br></div><div>All the best</div><div><br></div><div>François<br></div><div><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><b>François Lacombe</b><br><br>fl dot infosreseaux At gmail dot com<br><a href="http://www.infos-reseaux.com" target="_blank">www.infos-reseaux.com</a><br><a href="http://www.twitter.com/InfosReseaux" target="_blank">@InfosReseaux</a></div></div></div>
<br><div class="gmail_quote">2018-07-24 11:57 GMT+02:00 Dave F <span dir="ltr"><<a href="mailto:davefoxfac63@btinternet.com" target="_blank">davefoxfac63@btinternet.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
Hi<br>
<br>
This is another one of those discussion which comes up every year or
so.<br>
<br>
The perception of danger is subjective; which never fits well within
OSM. <br>
<br>
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.<br>
<br>
If there's a sign indicating danger, tag that.<br>
<br>
Cheers<br>
DaveF<div><div class="h5"><br>
<br>
<div class="m_7024955036661704553moz-cite-prefix">On 23/07/2018 21:48, François Lacombe
wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div class="h5">
<div dir="ltr">
<div>Hi,</div>
<div><br>
</div>
<div>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.</div>
<div>It is actually related to what we intend to map with
intermittent or seasonal.</div>
<div><br>
</div>
<div>For example in France, we often find such warning signs:</div>
<div><a href="https://imgur.com/a/QUxuPem" target="_blank">https://imgur.com/a/QUxuPem</a></div>
<div><br>
</div>
<div>Precise sections of streams or rivers are marked as
dangerous even in good weather.</div>
<div>It is stronger than simple intermittence or seasonality
because of industrial activities running upstream (mainly
hydroelectric power generation or dam operation).</div>
<div>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.<br>
</div>
<div><br>
</div>
<div>Here is a public display next to a power plant in French
Alps (with a nice piece of OSM without attribution)</div>
<div><a href="https://imgur.com/a/TLhZcgE" target="_blank">https://imgur.com/a/TLhZcgE</a><br>
</div>
<div><br>
</div>
<div>Then what could be the best way to tag it?<br>
</div>
<div>No existing tag sounds suitable for this, even the idea of
a single "permanence" key.</div>
<div><br>
</div>
<div>All the best</div>
<div><br>
</div>
<div>François</div>
</div>
<br>
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<br>
</div></div><pre>______________________________<wbr>_________________
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</pre>
</blockquote>
<br>
</div>
</blockquote></div><br></div>