My suggestion would be to map only the normal and the predictable. If it's 
usually not navigable in summer, "no @ summer" or something. If it's not really 
predictable, I wouldn't map it unless it's something dangerous like vulnerable 
to flash floods or lahars.

Highways liable to getting cut off by snow might be a thing to compare against. 
I don't recall what the tagging is there off the top of my head.

--Jarek

On February 15, 2019 12:37:41 PM EST, Fernando Trebien 
<fernando.treb...@gmail.com> wrote:
>Hello,
>
>motorboat=* is used to represent waterways (rivers, canals and lakes)
>that are open to inland navigation. In a river that does not dry up
>enough to be mapped as intermittent=yes, is it possible to represent
>that a river is sometimes not navigable according to local authorities
>due to varying water level, by vessels that are at least a bit larger
>than a canoe, typically cargo or passenger vessels?
>
>motorboat:conditional only works if the periods where the river is
>navigable are predictable, and that usually depends on the variable
>amount of rain on the basin.
>
>Regards,
>
>-- 
>Fernando Trebien
>
>_______________________________________________
>Tagging mailing list
>Tagging@openstreetmap.org
>https://lists.openstreetmap.org/listinfo/tagging

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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