Anche se... leggendo bene wiki osm non è che sia così errato...

Usage
intermittent=yes is used

to indicate that a waterway=* (river, stream, etc.) does not have a permanent flow

https://wiki.openstreetmap.org/wiki/Key:intermittent#Intermittent_vs._seasonal
            ---
            
            Published using OSMCha: https://osmcha.org/changesets/145507943
            