See also notes in the rapid_poly layer. The tagging is basically the same.
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http://wiki.openstreetmap.org/wiki/Waterway
http://wiki.openstreetmap.org/wiki/Whitewater_sports#River
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RP: mainly fine. the only problem is what to do with the name. the piece of river it replaces will have a name which needs to be included, as will the rapids. how do we name both on one segment? a relation for the whole river may be the only way
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HB Aug 2012: osm Whitewater_sports wiki suggests "whitewater:section_name". We don't know the grade so I've just called it whitewater=rapids. With that, looks ok to me.
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See ML discussion here:
https://groups.google.com/d/msg/nzopengis/-/Kmr97AQz9r4J
and here:
https://groups.google.com/d/msg/nzopengis/-/ ?