<div dir="ltr"><div>Slippery terrain. In the sense of definitions.</div><div><br></div><div>Concerning the tunnel=flooded wiki page:</div><div><br></div><div>The symbol shows free flowing water (air above the surface), wherea the first example is for a headrace where "no air can get inside" Why is this situation not tagged as pipeline? (see last row <a href="https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dpipeline#Usage)" target="_blank">in this table</a>?)</div><div><br></div><div>The page states:</div><div>...
<tt dir="ltr" class="gmail-mw-content-ltr" style="background:rgb(238,238,255) none repeat scroll 0% 0%;font-size:1em;line-height:1.6"><a href="https://wiki.openstreetmap.org/wiki/Key:tunnel" title="Key:tunnel">tunnel</a>=<a href="https://wiki.openstreetmap.org/wiki/Tag:tunnel%3Dyes" class="gmail-mw-redirect" title="Tag:tunnel=yes">yes</a></tt> where a path is usually intended for human to safely pass and where water level is usally controlled for safety reasons
"</div><div>I don't find areference to this implied meaning of tunnel=yes</div><div>Many, if not the majority of the UK Inland Waterways canals have no towpath.</div><div><br></div><div>Other comments on the key "tunnel", referring to <a href="https://taginfo.openstreetmap.org/search?q=tunnel%3D" target="_blank">taginfo "tunnel="</a>:</div><div><br></div><div>Absence of
"tunnel= *" means: "this way is not in a tunnel of any type"</div><div>"tunnel=yes" on a way means: "this way is in a tunnel of some type"</div><div><br></div><div>It looks as if <a href="https://taginfo.openstreetmap.org/keys/tunnel%3Atype" target="_blank">tunnel:type</a> is practially not used</div><div>We use instead <a href="https://taginfo.openstreetmap.org/search?q=tunnel%3D" target="_blank">tunnel= *</a> to indicate the type of tunnel.</div><div>This tagging is unfortunate, but in line with the (original) bridge approach</div><div>tunnel=culvert is the most frequent value: 1208667 uses</div><div>tunnel=flooded is rare in comparison; 2060 uses<br></div><div><br></div><div>There is also 3337 instances of tunnel=covered, which, at least in Italy (140) seem mainly tagging errors</div><div><br></div><div>Volker<br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div id="m_-1238100284516781063m_8219448373121648817DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
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<td style="width:470px;padding-top:12px;color:#41424e;font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Virus-free. <a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" style="color:#4453ea" target="_blank">www.avast.com</a>
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</tbody></table><a href="#m_-1238100284516781063_m_8219448373121648817_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></a></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, 22 Mar 2020 at 01:04, Martin Koppenhoefer <<a href="mailto:dieterdreist@gmail.com" target="_blank">dieterdreist@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
<br>
sent from a phone<br>
<br>
> On 22. Mar 2020, at 00:46, Joseph Eisenberg <<a href="mailto:joseph.eisenberg@gmail.com" target="_blank">joseph.eisenberg@gmail.com</a>> wrote:<br>
> <br>
> How safe for walking does the tunnel have to be?<br>
<br>
<br>
waterways often will have quite different levels depending on the atmospheric conditions in the past days and weeks in the upstream area.<br>
<br>
When does it have to be safe? 99.9% of the year? At all times? 70%?<br>
<br>
Cheers Martin <br>
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