[Tagging] Drain vs ditch

[Warin]

On 19/02/19 20:40, Eugene Podshivalov wrote:
> Canals and ditches are artificial channels carrying naturual water
this suggests there is 'unnatural' water...
> , so are the channels of a straightened river or stream. imho there is 
> not difference between them.
No difference to the water (natural or otherwise).
> If we had such sections tagged as artificial waterways it would be 
> possible to calculate statistics on man's impact on natural waterways 
> and detect the old natural channels.

Many 'natural' waterways have older 'natural' channels. In fact many 
have more than one set of older 'natural' channels.

Many waterways have been changed by man's actions, sometimes the effect 
was intentional.
Picking which sections are 'natural' or 'unnatural' ... can be a 
difficult job. Verifiable? In some cases only by an expert.
Not something I'd map. Is not OSM for the present, use OHM for the history?

> Considering narrow river sections are tagged as waterway=stream, and 
> wide streams are tagged as waterway=river, it is only waterway 
> relations which let you actually understand what that waterway is.
>
> Cheers,
> Eugene
>
> вт, 19 февр. 2019 г. в 02:40, Paul Allen <pla16021 at gmail.com 
> <mailto:pla16021 at gmail.com>>:
>
>     On Mon, 18 Feb 2019 at 23:30, Graeme Fitzpatrick
>     <graemefitz1 at gmail.com <mailto:graemefitz1 at gmail.com>> wrote:
>
>
>         On Tue, 19 Feb 2019 at 09:23, Paul Allen <pla16021 at gmail.com
>         <mailto:pla16021 at gmail.com>> wrote:
>
>
>             According to a sketch in a comedy show from so long ago I
>             can barely remember it, the source
>             of the River Thames was traced to a dripping tap.  Which
>             was fixed and the river dried up.
>
>             I don't think it was Monty Python, though it might have
>             been.  Possibly one of Python's
>             precursors.
>
>
>         Seem to remember that one!
>
>         Goodies?
>
>
>     Going well off topic here.
>
>     It was an isolated sketch, whereas Goodies had themed episodes. 
>     TW3, maybe.  Something like
>     that.  The only reason I don't think it was the Python's is I
>     can't find it on youtube or even google. I
>     was beginning to wonder if I'd imagined it.
>
>     -- 
>     Paul
>
>
>         Thanks
>
>         Graeme
>         _______________________________________________
>         Tagging mailing list
>         Tagging at openstreetmap.org <mailto:Tagging at openstreetmap.org>
>         https://lists.openstreetmap.org/listinfo/tagging
>
>     _______________________________________________
>     Tagging mailing list
>     Tagging at openstreetmap.org <mailto:Tagging at openstreetmap.org>
>     https://lists.openstreetmap.org/listinfo/tagging
>
>
>
> _______________________________________________
> 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/20190220/c9645adb/attachment.html>