Meaning of tunnel=flooded vs tunnel=yes for waterways?

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Meaning of tunnel=flooded vs tunnel=yes for waterways?

Joseph Eisenberg
The proposal https://wiki.openstreetmap.org/wiki/Proposed_features/Hydropower_water_supplies
introduced the tags waterway=pressurized for non-pipeline waterways
that are completely filled with water.

It also introduced tunnel=flooded for waterways and pipelines, and the
wiki page has this description:
https://wiki.openstreetmap.org/wiki/Tag:tunnel%3Dflooded

"A flooded tunnel is an artificial structure intended to channel water
on a significant distance. Its dimensions and length allow human to
fit inside but safe walking is impossible due to high amount of water
or other fluid expected in operation.
Such tunnels are different from tunnel=culvert where human usually
can't enter and for which dimensions are restricted to building or way
it is supposed to go underpass.
They are also different from man_made=pipeline since a pipeline is
built from tubes assemblies."

I'm a little confused about how to decide when to use tunnel=flooded
vs tunnel=yes with waterway=canal or other free-surface-flow
waterways. Is this tag meant to replace all instances of tunnel=yes
for large waterways, or are there situations when tunnel=yes with
waterway=canal would still be needed?

-Joseph Eisenberg

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Re: Meaning of tunnel=flooded vs tunnel=yes for waterways?

François Lacombe-2
Hi Joseph,

Le mer. 29 mai 2019 à 01:55, Joseph Eisenberg <[hidden email]> a écrit :
I'm a little confused about how to decide when to use tunnel=flooded
vs tunnel=yes with waterway=canal or other free-surface-flow
waterways. Is this tag meant to replace all instances of tunnel=yes
for large waterways, or are there situations when tunnel=yes with
waterway=canal would still be needed?

As mentioned on wiki Talk, look at those two pictures regarding waterway and tunnels :

Additionally you can look at this for waterway=canal + tunnel=yes

tunnel=flooded + man_made=pipeline isn't so recommended because it means that the pipeline is inside a flooded tunnel.
It occurs when the tunnel is dug under groundwater level (I know at least one tunnel like this in Paris)
Or here as a penstock runs inside an underground tailrace canal : https://www.openstreetmap.org/way/319267776

Many pipes and cables are in the same tunnel, like many bike lanes, car and bus lanes are on the same bridge.

Hope it helps

François

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