Looking at the existing guidelines it would be waterway=canal and canal=headrace (canal here used in the power rather than transport context)
If this is indeed correct then it's not very obvious but it is detailed here: https://wiki.openstreetmap.org/wiki/Proposed_features/Hydropower_water_supplies#Headraces Regards, *Paul* On Thu, 14 Nov 2019 at 11:16, Charlie Reid <[email protected]> wrote: > Hi > > > > Can find no guidance on the Wiki about tagging mill races. I come across > these continually while surveying. > > > > They are a totally distinctive water feature which don’t bear much > relation to listed waterway types. Drain seems to be the closes value – but > this really misrepresents their appearance, purpose and behaviour. > > > > Any thoughts > > > > Charlie Reid > > > > > _______________________________________________ > Talk-GB mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk-gb >
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