|usage = tailrace|
|Waterway specific usage dedicated to water release from turbines output after energy production|
|Used on these elements|
|Tools for this tag|
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
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.
|Outdoor canal releasing water out of an underground power plant. Water intermittently goes towards photographer.|