On the canal wiki article <http://wiki.openstreetmap.org/wiki/Canal> it says "An artificial open waterway used for transportation, waterpower, or irrigation." I guess we have to add "drinking water" to that list.
When you look at the Wikipedia canal article<http://en.wikipedia.org/wiki/Canal>, there is nothing remotely similar to a qanat. I really don't understand why we have to flatten complexity of all types of waterways into a few different tags. Janko
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