Key:waterway

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Public-images-osm logo.svg waterway
Nau im Langenauer Ried 600x450.jpg
Description
The waterway tag is used to mark rivers or other kind of waterways.
Group: Waterways
Used on these elements
may be used on nodesmay be used on waysshould not be used on areasmay be used on relations
Documented values: 35
Wikidata
Status: de facto

The waterway key is used to describe rivers, streams and boat-yards with a flow of water from one place to another.


Usage

See also: Waterways, Relation:waterway

By definition, a waterway is assumed to have a direction of flow. The direction of the way should be downstream (from the waterway's source to its mouth).

For small waterways, a way indicating a direction of flow and its path is sufficient. When a waterway becomes wide enough that mapping the area it flows through is desired, the suggested tagging scheme is natural=water + water=river. (Note: A legacy method of tagging river areas/multipolygons is waterway=riverbank. Both methods are valid, though using the former keeps "areas of water" type features grouped together with a consistent tag set.)

If a waterway way is known to not have water flow year round, it should always be tagged with intermittent=yes. (Non-permanent flow can be further described with the seasonal=* tag to describe when a flow of water exists, but intermittent=yes should still be present in these cases.)

If a waterway is named from its source to its destination, it's strongly suggested that all of its ways be placed in a waterway relation. Doing this allows Nominatim to group the ways together and return exactly one named result per named waterway that exists in OpenStreetMap.

Values

The main waterway=* values are distinguished according to the flowing regime as follow:

Free flow Pipe flow
Man made Open air Culvert Tunnel Pipeline
canal (useful water) pressurised
ditch brook
drain (superflous water)
Natural Open air cave Siphon
river pressurised
stream

The only questions to ask to get the difference between Free flow and Pipe flow is Does water flow inside a closed space and can air get inside the conduit? If yes, the water can't be pipe flow and you'll have to choose for an according waterway=* value from the table.
Even if waterway=* values can be refined or replaced, it would be really nice to preserve the distinction between free/open channel and pipe flow features. It's really important data for water management and resource planning.


Key Value Element Comment Rendering Photo

Natural watercourses

waterway river Way For narrow rivers which will be rendered as a line. For larger rivers see also waterway=riverbank (Other languages).
Rendering-waterway-river.png
Nau im Langenauer Ried 600x450.jpg
waterway riverbank Area Used for larger rivers in addition to waterway=river, to define an area between the opposite riverbanks. See water=river for alternative tagging.
Rendering-waterway-riverbank.png
Dscf1891-800.jpg
waterway stream Way A naturally-formed waterway that is too narrow to be classed as a river. An active, able-bodied person should be able to jump over it if trees along it aren't too thick.
Rendering-waterway-stream-mapnik.png
450px-Marshall-county-indiana-yellow-river.jpg
waterway wadi Way A natural, dry (ephemeral) riverbed that contains water only during times of heavy rain or simply an intermittent stream, in semi-arid areas. Also known as a "Wash" in the deserts of America.
It has been recommended to stop using this tag. For intermittent waterways use waterway=river/waterway=stream + intermittent=yes. For valleys natural=valley.
Rendering-waterway-wadi-mapnik.png
NahalashanS.jpg
waterway drystream Way Dry stream bed - negative forms of erosion relief formed by the activity of temporary streams.
Don't use this tag. For intermittent waterways use waterway=stream + intermittent=yes. For valleys use natural=valley.

Man made waterways

waterway canal Way An artificial open flow waterway used to carry useful water for transportation, waterpower, or irrigation. (Other languages).
Grand Union Canal.jpg
waterway pressurised Way A waterway where water is pipe flowing in closed space without air.
Waterway pipe flow tunnel.png
waterway drain Way An artificial free flow waterway used for carrying superfluous water like storm water or industrial discharge.
Example Drain.jpg
waterway ditch Way An small artificial free flow waterway used for carrying superfluous water along paths or roads for drainage purposes.
Forest ditch.JPG
waterway fairway Way A navigable route in a lake or sea marked by buoys.
This value is questioned and conflicts with seamark:type=fairway.

Facilities

waterway dock Node Area An 'enclosed' area of water used for building or repairing ships.
Ship-Dock.jpg
waterway boatyard NodeArea Boat yard – a place for constructing, repairing and storing vessels out of the water.
Boatyards, Rhyll.jpg

Barriers on waterways

waterway dam Way Area A wall built across a river or stream to impound the water. A dam normally does not have water flowing over the top of it.
Amagase Dam.jpg
waterway weir Node Way A barrier built across a river, sometimes to divert water for industrial purposes. Water can still flow over the top.
Alifakovac Miljacka.jpg
waterway stream_end Node The natural end of a stream (where it seeps into the ground).
waterway waterfall Node A waterfall, use in combination with natural=cliff
Waterfall near Keldur.JPG
waterway lock_gate Node To mark the position of gates at each end of a lock. Alternatively, for smaller locks use a single lock=yes node in the middle of the lock.
JesusGreenLock-Cambridge.jpg

Other features on waterways

waterway turning_point Node A place to turn the driving direction for vessels, where the boats are longer than the river/canal is wide. Use maxlength=* to denote the maximum length of the vessel.
waterway water_point Node A place to fill fresh water holding tanks of a boat.
waterway fuel Node Area A place to get fuel for boats.

Some additional attributes for waterways

intermittent yes Way Indicates that the waterway does not have a permanent flow (i.e. is sometimes/often dry).
Rendering-intermittent-river-mapnik.png
seasonal yes, spring, summer, autumn, winter, wet_season, dry_season Way Indicates that a waterway has a seasonal (yearly cyclic) flow.
Four seasons.jpg
destination name Way Name of the body of water the linear feature flows into.
lock yes Way (Node) A lock is used for moving boats between waterways at two different levels. Can tag either the section of the way between the gates (detailed) or just a single node in the waterway (less detailed).
JesusGreenLock-Cambridge.jpg
mooring yes, private, no Way A length of bank where boats are explicitly permitted to moor. maxstay=* should be used for timing information.
Lamanage La Rochelle.jpg
usage transmission, irrigation, headrace, tailrace, penstock Way A waterway=canal may have one (or more; separate with semicolons) uses.
tunnel culvert Way (Node) A short tunnel usually installed under roads, railways or building. Its size doesn't allow human to get inside and is as narrow as the structure is supposed to go under. For streams passing under a road in culverts use tunnel=culvert+layer=-1 on the section of stream passing under the road. Don't use either of these tags for streams passing under bridges.
Culvert.jpg
tunnel flooded Way A long (>100m) tunnel where flowing water or other fluid prevent humans from safely walking inside despite its appropriate diameter or size. Water inside can be pressurised or not, used in combination with any waterway=* linear value.
Waterway free flow tunnel.png
waterway user defined Node Way All commonly used values according to Taginfo
This table is a wiki template with a default description in English. Editable here.