[Tagging] siphon underpass

[Martin Koppenhoefer]

taginfo has
88 pipeline=siphon and
7 man_made=inverted_siphon

The culvert article in WP:en doesn't mention siphons, but the siphon article says they can occur in culverts: https://en.m.wikipedia.org/wiki/Siphon

My proposal is 
culvert=inverted_siphon
as an attribute to all kind of liquid carrying ways.

cheers,
Martin


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