Hi Joseph, Here are some points to make it clearer
This is the base situation : https://wiki.openstreetmap.org/wiki/File:Waterway_drain_outlet.jpg Le dim. 22 mars 2020 à 00:46, Joseph Eisenberg <joseph.eisenb...@gmail.com> a écrit : > Should a waterway=river every be tunnel=flooded, or is it then a canal? > Even if waterway=river is listed under useful combinations I think this table is more correct : https://wiki.openstreetmap.org/wiki/Key:waterway#Values Then only drain or canal could be suitable for tunnel=flooded and waterway=river could be removed from combinations (and even be marked as incompatible) > How safe for walking does the tunnel have to be? > Flooded means you can't stay dry and expose yourself to drowning hazard, even if there no water at the time you get inside the tunnel. > What about if a boat can go through the tunnel, but you can't walk? > It's flooded, no exceptions Its not the case for Canal Saint Martin in Paris, since water level can't rise up the built in passageways even if boat use to go inside too So here tunnel=yes works. https://www.urbextour.com/en/saint-martin-canal-is-the-biggest-underground-river-in-paris/ All the best François
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