Tag:culvert=inverted siphon

culvert = inverted_siphon
Description
A U-shaped tunnel that allows a waterway to cross an obstruction. 
Group: Waterways
Used on these elements
Requires
Status: in use
More details at taginfo
Tools for this tag

An  inverted siphon is a U-shaped culvert that allows one waterway cross an obstruction, by flowing down and then back up.

This is an unusual feature because water can not normally flow upwards, as shown in the diagram.

How to map

Tag the waterway as waterway=* + tunnel=culvert + culvert=inverted_siphon.

Example: Photo | OSM

Non-inverted siphons

 Non-inverted siphons (or 'normal' siphons) are not tunnels, and should not use this tag. Instead, use man_made=pipeline + location=overground.

Example: Photo | YouTube.

Possible tagging mistakes

If you know places with this tag, verify if it could be tagged with another tag.
Automated edits are strongly discouraged unless you really know what you are doing!

History

There was a discussion on the tagging mailing list about how to tag inverted siphons. This tag was the only suggestion.

See also

  • tunnel=siphon considered by some to be the correct term for this kind of crossing rather than tunnel=culvert.
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