[Tagging] Waterway direction

[M∡rtin Koppenhoefer]

2010/9/1 Anthony <osm at inbox.org>:
> Couldn't incline=up/incline=down work for waterways too?
>
> Then incline=down could be default, and incline=unknown could be added
> where the incline is unknown.


This is not always true, think about culverts:
http://de.wikipedia.org/wiki/Datei:D%C3%BCker.jpg
http://www.ikt.de/newsletter/09_01/dueker1.gif

(OK, I am aware that this is a special kind of culvert, or is there a
better term for this in English?)

cheers,
Martin