The way I interpret it:
The default state (no tags) is: water always flows The seasonal, intermittent and ephemeral tags says For these times, the explicit state is: the water always flows, is intermittent, or is ephemeral For all other times, the default state is: the water never flows Explicit state always overwrites default state. The only thing left to specify now is the priority of the 3 keys. If two or more of them overlap in their explicit state for the same timeframe, which one has priority, or is it simply considered a tagging error? From: Mateusz Konieczny <matkoni...@tutanota.com> Sent: Thursday, 24 May 2018 17:08 To: Tag discussion, strategy and related tools <tagging@openstreetmap.org> Cc: 'Tag discussion, strategy and related tools' <tagging@openstreetmap.org> Subject: Re: [Tagging] RFC proposed water property key 'ephemeral ' 24. May 2018 06:39 by osm.tagg...@thorsten.engler.id.au <mailto:osm.tagg...@thorsten.engler.id.au> : If I’ve understood it correctly, I would tag that as: seasonal=winter,spring,autumn ephemeral=summer Yes, it would work.
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