[Tagging] Definition of lake/pond as applied to stream/plunge pools

[Joseph Eisenberg]

The tag water=stream_pool was documented only at Key:water, so I've now
created a new page for the tag with more details after this discussion:

https://wiki.openstreetmap.org/wiki/Tag:water%3Dstream_pool

"The tag water <https://wiki.openstreetmap.org/wiki/Key:water>=stream_pool is
used to map the water area of a *stream pool*: a small but relatively deep
collection of fresh water, occurring along a narrow stream. Water velocity
in the pool is typically much lower than in the stream. Frequently found
below a waterfall, where it is also called a "plunge pool". May be used as
a "swimming hole".

This tag is used for pools along narrow streams which are otherwise only
mapped as a linear way with waterway
<https://wiki.openstreetmap.org/wiki/Key:waterway>=stream
<https://wiki.openstreetmap.org/wiki/Tag:waterway%3Dstream>. For wider
rivers (mapped with waterway
<https://wiki.openstreetmap.org/wiki/Key:waterway>=river
<https://wiki.openstreetmap.org/wiki/Tag:waterway%3Driver>), the areas of
the river, including "pools", are typically mapped with waterway
<https://wiki.openstreetmap.org/wiki/Key:waterway>=riverbank
<https://wiki.openstreetmap.org/wiki/Tag:waterway%3Driverbank> or water
<https://wiki.openstreetmap.org/wiki/Key:water>=river
<https://wiki.openstreetmap.org/wiki/Tag:water%3Driver> instead."

-- Joseph Eisenberg

On Thu, Dec 24, 2020 at 5:43 AM Paul Allen <pla16021 at gmail.com> wrote:

> On Thu, 24 Dec 2020 at 05:40, Andrew Harvey <andrew.harvey4 at gmail.com>
> wrote:
>
>> I'm giving away all my favourite spots here but both of these the stream
>> is mapped a a way, and has the pool under the waterfall mapped as an area,
>> so you can determine pools under a waterfall based on the natural=water
>> area with one of the nodes being a waterway=waterfall node.
>>
>> https://www.openstreetmap.org/way/531128566
>> https://www.openstreetmap.org/way/32173325
>>
>> If we want a separate tag for this that's fine, but currently people use
>> the water=stream_pool in OSM to tag these.
>>
>
> Until water=stream_pool came along, these would have been mapped
> as water=pond, or even left as natural=water without defining the
> type of water.  I expect many still are mapped that way, even
> today.
>
> Do we need to differentiate between stream pools and plunge pools
> given that so many of both are already mapped as ponds?  I can
> see arguments both ways and don't (yet) have strong feelings
> either way.
>
> --
> Paul
>
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