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Available languages — Tag:usage=tailrace
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Public-images-osm logo.svg usage = tailrace
Waterway tailrace.jpg
Waterway specific usage dedicated to water release from turbines output after energy production
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
Status: approvedPage for proposal

The tailrace at the end of millrace

Tailraces paths allow water to flow from turbines to natural environment in a power generation facility.
Most of the time, free flow canal are used as tailraces, they can be outdoor or in a tunnel depending of the environment.
Those canals aren't pipe flow (pressurised) since the pressure is converted into power with power=generator help.
A tailrace waterway can go through a tunnel=flooded, be in free space or even in a man_made=pipeline. Have a look below how to tag them according to this specific usage.

It may be possible to involve water release infrastructure in Relation:waterway with side_stream role only if all water is took and released in the same river. It's not always the case and waterway=* graph have to be extended with or without waterway relation membership.

How to map

Don't forget to have a look at Waterways or waterway=* for more complete tagging possibilities.
These guidelines are dedicated to usage=tailrace situations.

As any waterway and for power generation only, draw a line along the path followed by water. Put usage=tailrace on any segment between generators and release points you may see in a lake or a river.
Tailraces can length a few meters to kilometres depending on how far the plant is from the water release point.

Depending on power plant exploitation rules, water may flow intermittently. You can use intermittent=yes accordingly.


Photo Tagging Note
Tailrace outdoor canal


Outdoor canal releasing water out of an underground power plant. Water intermittently goes towards photographer.

See also