|waterway = canal|
|An artificial open flow waterway used to carry useful water for transportation, waterpower, or irrigation.|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
Use waterway=canal for man-made open flow (free flow vs pipe flow) waterways used to carry useful water for transportation, hydro-power generation or irrigation purposes. The tag can also be used for underground free flow (with tunnel=*), not just above ground.
For a natural watercourse use waterway=river or waterway=stream. For water carried in pipes use man_made=pipeline. For small artificial waterways used for drainage see waterway=drain and waterway=ditch. For navigable route marked by buoys in large water bodies like a lake or a sea that are not canals or rivers use waterway=fairway.
How to Map
- See also: Waterways
Create a simple way in the direction of flow of the canal and tag it with waterway=canal. In order to allow routing, do ensure that the ends of the way connect correctly with and other related waterway features, including other canals, rivers, streams, lakes etc.
Sections with a lock should be tagged with lock=*, with nodes marked with waterway=lock_gate at each end. Usability for navigation by different vessels can be given using a variety of tags. Use boat=* to indicate that it can be used for a rowing-boat, motorboat=* for a motorboat. For more seriously commercial navigation use CEMT=* in Europe and ship=* elsewhere.
Engineering features can be shown using cutting=*, embankment=*, bridge=aqueduct and tunnel=* as appropriate. Consider adding width=* to indicate the width in metres, for example width=5, or alternatively use natural=water + water=canal to create an area for the canal in addition to the linear 'canal' feature along the centreline.
Different usage=* values can be used to distinguish between transportation, water power, or irrigation.
- Canals are drawn as blue lines on the standard Openstreetmap-Carto rendering style.
- They are rendered in dark green on the OpenRiverBoat tiles (ex. fluv.io map) when they are navigable.
- waterways: generic information about waterways
- Approved proposal Proposed_features/Hydropower_water_supplies, which describes how waterway=canal fits with related terms