[Tagging] Tagging estuaries: estuary=yes or river=estuary?

[Warin]

? Puzzled as to;

estuary = tidal mount of a large river? As defined by the Oxford Dictionary.

Why not tag tidal - that can be applied to many things not just large rivers?

https://wiki.openstreetmap.org/wiki/Key:tidal

No need for yet another key? Or is there another definition of estuary?

On 26/10/19 10:17, Joseph Eisenberg wrote:
> Previously I have asked about mapping estuaries in relation to tidal
> channels and mangroves, and there was rough consensus that estuaries,
> like tidal channels, should be outside of the coastline (that is, the
> sea should include the area of the estuary of tidal channel).
>
> But we did not decide on how to tag the estuary itself. Since the
> water is outside of the coastline, it's not strictly necessary to tag
> it, but it would be useful to know the areas covered by estuaries in a
> certain region, and differences in salinity or water flow can be used
> to distinguish rivers, estuaries and open sea.
>
> I would propose mapping estuaries by having the coastline go up to the
> inland limit of the estuary, but then also mapping the estuary as
> waterway=riverbank or water=river, + a tag that specifies that it is
> an estuary. There's already tidal=yes and salt=yes which can be used,
> but salt=yes doesn't have a clear cut-off for slightly saline
> estuaries, and not all estuaries have large tidal variation.
>
> So I would propose a new tag for estuaries. Options would be either
> `estuary=yes` which is pretty clearly a property tag, or
> river=estuary, which makes it clear that this is a class of river.
>
> river=estuary is nice, except when the area is tagged as
> wateryway=riverbank it doesn't match perfectly.
>
> - Joseph Eisenberg
>
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