Tag:tunnel=flooded

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Public-images-osm logo.svg tunnel = flooded
Waterway free flow tunnel.png
Description
A long (>100m) tunnel where flowing water or other fluid prevent humans from safely walking inside
Used on these elements
should not be used on nodesmay be used on waysshould not be used on areasshould not be used on relations
Useful combination
Wikidata
Status: approvedPage for proposal

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 prevent to safely walk 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.

How to map

On the path of the tunnel, draw a line and put tunnel=flooded on it.
You can add location=underground and a negative layer=* value

See tunnel=* and waterway=* for a description of the preferred way of connecting channelised waterways to adjoining waterway sections.

Examples

Photo Tagging Note
Headrace tunnels map

waterway=pressurised
tunnel=flooded
usage=headrace
location=underground
diameter=4900
operator=...

Horizontal tunnels carrying water from intakes to penstocks. Such ways have a pipe flow regime, their inlet are always below the water level and no air can get inside.
Underground water tunnel outlet

waterway=canal
tunnel=flooded
usage=headrace
location=underground
operator=...

A headrace tunnel works at atmospheric pressure and water have a free surface while flowing inside. Its inlet is designed to be always above water level and air can get inside too.