[Tagging] Feature Proposal - RFC - Check dam

[Yves]

Not quite, and anyway a 'detention pond' would be behind the dam, not the structure itself.
Regards, Yves 

Le 9 juin 2021 10:00:01 GMT+02:00, Warin <61sundowner at gmail.com> a écrit :
>On 8/6/21 1:40 pm, Yves via Tagging wrote:
>> What I see when I look for pictures of check dams are structures that 
>> limit the flow. Contrary to what I expect from a weir, the water goes 
>> trough or under.
>> That would deserve a tag or subtag to make them distinct from weirs.
>
>Detention pond?
>
>https://wiki.openstreetmap.org/wiki/Tag:basin%3Ddetention
>
>
>> Regards,
>> Yves
>>
>> Le 7 juin 2021 23:28:02 GMT+02:00, Enno Hermann 
>> <enno.hermann at gmail.com> a écrit :
>>
>>
>>     On Mon, Jun 7, 2021 at 6:03 PM Mateusz Konieczny via Tagging
>>     <tagging at openstreetmap.org <mailto:tagging at openstreetmap.org>> wrote:
>>
>>         https://wiki.openstreetmap.org/wiki/File:Check_dam_on_Miya_River_(Jinzu_River).jpg
>>         for me it looks like waterway=weir
>>
>>         "Solid check dams usually have water flowing over only a small
>>         part of their width and
>>         are designed to handle sudden increases in water flow."
>>
>>         Are you sure that thing depicted on image is not also a weir?
>>
>>
>>     I agree that it's not the best example and from this picture alone
>>     it could be hard to tell, although the construction is typical for
>>     check dams. I managed to find the location and on Google
>>     Streetview (https://goo.gl/maps/PrtuW627ndkc3NbX7) or the Japan
>>     GSI seamlessphoto imagery (https://osm.org/go/7QeF1CmI6) the water
>>     level is clearly different and water seems to be flowing only
>>     through the bottom of the structure. Given that, the mountainous
>>     terrain and similar structures nearby I would say it is clearly a
>>     check dam.
>>
>>         And "designed to handle sudden increases in water flow." is
>>         applicable to
>>         any sanely constructed waterway engineering.
>>
>>
>>     "sudden and significant" might fit better. Often those streams are
>>     normally only a trickle or even completely dry but then can see
>>     sudden debris flows like this:
>>     https://www.youtube.com/watch?v=2Rfuoylv34k This is different from
>>     floods on already larger rivers.
>>
>>         See
>>         https://en.wikipedia.org/wiki/File:Culverts_under_yass_river_walkway_weir.JPG
>>         on Wikipedia weir page.
>>
>>         Or
>>         https://en.wikipedia.org/wiki/File:Grial%C3%ABces_cuecenes.jpg
>>         with description
>>         "During periods of high river flow, this nineteenth century
>>         weir of porphyry stone on
>>         a creek in the Alps would have significantly more water
>>         flowing over it."
>>
>>
>>     An early example of a check dam? ;) I'd say very small structures
>>     or simple constructions that can't be clearly identified as a
>>     check dam may just be tagged as weirs.
>>
>>
>> _______________________________________________
>> Tagging mailing list
>> Tagging at openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/tagging
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tagging/attachments/20210609/ec79de6e/attachment.htm>