OK, I gathered the three ideas here:
http://wiki.openstreetmap.org/wiki/Proposed_features/Qanat#Tagging

Any thoughts on it? Preferences?

I realized it is not easy to make a distinction between canal and
aqueduct, but we may assume that the latter is usually for drinking
water or irrigation of small areas of land. Everything dealing with
navigation, flood protection or vast area irrigation would be rather a
canal.

-- 
Michał

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