[Tagging] Feature Proposal - RFC - Check dam

[Warin]

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/20210609/60c87a7f/attachment-0001.htm>