NOTE TO UPLOADERS:

merge with river_poly layer as needed. These seem to overlap.

river rapids
http://wiki.openstreetmap.org/wiki/Waterway
http://wiki.openstreetmap.org/wiki/Tag:waterway%3Drapids
http://wiki.openstreetmap.org/wiki/WikiProject_Whitewater_Maps
http://wiki.openstreetmap.org/wiki/Whitewater_sports#River
? waterway=rapids is only listed for nodes and polylines, not areas
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RP: we can use it for either, don't worry about what it says on the wiki; that's only a guide
the same naming problem as for rapids_cl exists here also
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HB Aug 2012: for name we can use whitewater:section_name from the osm Whitewater_sports wiki page. We don't know the grade, so just putting whitewater=rapids. With that, looks ok to me now.
for the record: a review of the vector layers shows that rapid_cl and rapid_poly do not overlap in the source data, although sometime they adjoin when one expands into the other.
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Further ML discussion:
https://groups.google.com/d/msg/nzopengis/-/Kmr97AQz9r4J
and
https://groups.google.com/d/msg/nzopengis/-/ ?