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 <pla16...@gmail.com
<mailto:pla16...@gmail.com>>:
On Mon, 18 Feb 2019 at 23:30, Graeme Fitzpatrick
<graemefi...@gmail.com <mailto:graemefi...@gmail.com>> wrote:
On Tue, 19 Feb 2019 at 09:23, Paul Allen <pla16...@gmail.com
<mailto:pla16...@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
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