Per the wiki "Use waterway=canal for man-made open flow (free flow vs pipe 
flow) waterways used to carry useful water for transportation, hydro-power 
generation OR irrigation purposes."   E.g. there are a range of purposes for 
which waterway=canal is used.

The access tags could be used to make it clear - access=no and/or boat=no.

---
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On Thu, 14 Nov 2019, at 12:22 PM, Martin Wynne wrote:
> "Canal" should surely be restricted to transport functions? Boating apps 
> presumably treat "canal" as a route unless navigation restrictions are 
> added.
> 
> If the stuff that is moving is the water rather than the boats, 
> "aqueduct" would be the correct term.
> 
> cheers,
> 
> Martin.
> 
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