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 sent from a phone
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