Tag:waterway=pressurised

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Public-images-osm logo.svg waterway = pressurised
Waterway pipe flow tunnel.png
Description
A waterway where water is pipe flowing in closed space without air
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

Pipe flow regime

This key is intended to map conduits where water is found pipe flowing in a closed space without air. As water is filling all space available in the conduit, it applies a positive static pressure on the conduit walls.
The conduit can be either a pipeline, a tunnel or even a cave which are mapped by associating waterway=pressurised with man_made=pipeline or tunnel=*.

Such a value refers to the pipe flow regime which is one of the three main flow regimes of liquid water. This regime is obtained by design when the intake of the conduit is built below the lowest water level the source can reach. This is the only use case fo waterway=pressurised.

How to map

When a conduit coming from an intake placed below water level is found in the country, just draw a line and add waterway=pressurised on it.
You may be interested to add man_made=pipeline or tunnel=* on it depending of the nature of the conduit. Look at the keys pages for more information.

Pressurised waterways can be member of Relation:waterway with appropriate role side_stream or main_stream depending of the situation.

Usage

Such waterways are found in water transmission, irrigation and hydropower systems which need large amount of water.
Depending on conduit usage, you can put usage=* with those values :

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Examples

Headraces

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.
Headrace pipeline in a tunnel

waterway=pressurised
man_made=pipeline
substance=water
usage=headrace
tunnel=yes
location=underground
operator=...
access=private

The most complete case with a headrace pipeline hosted in a human accessible tunnel in operation.
This is the only situation where man_made=pipeline is used in combination with tunnel=* on the same way.
Water siphon

On all parts, use:

waterway=pressurised
man_made=pipeline
substance=water
usage=headrace


operator=...

On the bridge part, use:
bridge=aqueduct

On the underground part, use:
location=underground

A big siphon allowing water to cross a valley. Only half side is visible on the picture, tunnels or pipelines are connecting each side at equivalent altitudes. The siphon is a pipe flow waterway.

Penstocks

Photo Aerial view Tagging Note
Pipeline penstocks
--

waterway=pressurised
man_made=pipeline
substance=water
usage=penstock
operator=...
location=overground
diameter=1200
pressure=70 bar

Metallic penstocks feeding a power plant down the mountain. No air can get inside and water goes pipe flow
Lack of free illustration --

waterway=pressurised
operator=...
man_made=pipeline
substance=water
usage=penstock
location=underground
diameter=4900
direction=both

Vertical shafts are shielded as pipeline without tubes. Pipes are connected upstream and downstream.

See the two vertical shafts on the power plant digital model and some pics of how it was built with a raise drill machine.
Since Nant de Drance power plant can pump water back, penstocks, tunnels and shafts get direction=both.