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

[Volker Schmidt]

Is the pond downstream from a watermill also a stream_pond?


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On Thu, 24 Dec 2020 at 19:10, Joseph Eisenberg <joseph.eisenberg at gmail.com>
wrote:

> 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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