[Tagging] waterway=fish_pass consistency

[François Lacombe]

Hi all,

A discussion has recently started about waterway=fish_pass here :
https://wiki.openstreetmap.org/wiki/Talk:Tag:waterway%3Dfish_pass

While writing
https://wiki.openstreetmap.org/wiki/Proposed_features/Hydropower_water_supplies
it was asked to not clutter waterway=* with spillway since it was a
specific usage of a man made canal.
Such ideas lead to separate waterway nature, usage and sometimes supporting
infrastructure to get a tagging model with 3 different corresponding keys.
A comprehensive table of waterways natures has been set here :
https://wiki.openstreetmap.org/wiki/Key:waterway#Values

May it be great to consider usage=fish_pass with waterway=* (canal,
presumably) for sake of consistency?

Feel free to read and comment on the Talk page

All the best

François
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