[Tagging] Canal banks

[Dave F.]

Hi

When mapping canals I've always drawn a closed polygon & used the tag 
waterway=riverbank when I've wanted to give them width. This is as per 
the wiki recommendation: 
http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dcanal.

A user has recently amended them all to natural=water & water=canal. Is 
there a specific reason for this? Does it correct any problems or give 
any advantages for rendering etc?

Regards
Dave F.

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