http://wiki.openstreetmap.org/wiki/Waterway
http://wiki.openstreetmap.org/wiki/Tag:waterway%3Ddrain

Uploaded for Chathams 23 Apr 2010 (HB)
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HB 22 Aug 2012: looks good to me.
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Glen wrote: Looks good to me.
https://groups.google.com/d/msg/nzopengis/-/dFfa8IXTsKEJ