Tag:waterway=weir

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Public-images-osm logo.svg waterway = weir
Wehr-Königsgraben.jpg
Description
A barrier built across a river, sometimes to divert water for industrial purposes. Water can still flow over the top.
Used on these elements
may be used on nodesmay be used on waysshould not be used on areasuse on relations unspecified
Useful combination

name=*

Status: Approved

A barrier built across a river, sometimes to divert water for industrial purposes. Water can still flow over the top. In the US this is often called a low-head or low-rise dam.

How to map

To map a small weir add a node along a river and tag it waterway=weir. If the weir has a name tag it name=*.

If the weir is long enough to be mapped as a way, create a way along the length of the weir and tag it waterway=weir. Again, add a name=* if it is known. The waterway=weir should share a node with the river where the cross.

Sometimes a fish pass is related with the weir.

(High-)ways over a weir

This subject was not part of the proposal but the most straightforward solution is that the highway =* and waterway=weir share a way. A section of this way may be marked with ford=yes if there is a ford.

Validators and QA tools may complain about this combination because they may have an overly generic rule saying that highways and waterways can not share a single way - this is one of the valid exceptions and tools should be fixed to accept it.

Tagging examples

Picture/Description Tags Mapnik Osmarender
Wehr-Königsgraben.jpg waterway=weir Render Weir1.png  ?? (Currently same as river)

Other photos

Alifakovac Miljacka.jpg

See also