Tag:usage=tailrace
 usage = tailrace
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| Description |
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Waterway specific usage dedicated to water release from turbines output after energy production 
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| Group: properties |
| Used on these elements |
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| Requires |
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| Useful combination |
Status: approved
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| Tools for this tag |
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Tailraces water courses are dedicated to hydropower. They 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 canal can be pressurised in case of pumping, despite 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, hydropower or waterway=* documentation 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 kilometers 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.
Examples
| Photo | Tagging | Note |
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waterway=canal
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Outdoor canal releasing water out of an underground power plant. Water intermittently goes towards photographer. |