------ Original Message ------
From: "Mike Evans" <mi...@saxicola.co.uk>
To: talk-gb@openstreetmap.org
Cc: "David Groom" <revi...@pacific-rim.net>
Sent: 28/08/2018 19:22:16
Subject: Re: [Talk-GB] Coastline and tidal rivers
On Tue, 28 Aug 2018 11:09:47 +0000
"David Groom" <revi...@pacific-rim.net> wrote:
There is no consensus.
Personally I'm not in favour of the view that any body of water which
is
tidal should be bounded by a way tagged as coastline.
Reasons for this
1) Ask any one who lives in say central London "do you live on the
coast" or do you live beside a river", most would I'm sure say beside
a
river, so surely our data should reflect that. I think this probably
is
what you mean by "seems more natural"
Well if they're in Central London then it is an estuary at that point
so they'd be incorrect. Hence the expression "estuary English", and not
"river English".
Both the Oxford and Cambridge Dictionaries define as estuary as part of
a river.
To quote Wikpedia "The district of Teddington a few miles south-west of
London's centre marks the boundary between the tidal and non-tidal
parts of the Thames".
The Wikipedia quote to which you refer suggests to me that this should
be tagged as a river, since the Thames is a river, parts of which are
tidal and parts of which are not. But it's still a river.
Perhaps "A History of the Foreshore and the Law Relating Thereto",
published 1888 would be a useful reference.
https://archive.org/details/ahistoryforesho00hallgoog
2) In part because the converse is not true, we bound large non tidal
water areas as coastline
Examples?
Baltic , Caspian & Black Seas
3) If knowledge that a body of water is tidal is important it can be
tagged "tidal = yes"
But then the decision has to made as to where to draw the line and tag
one side as "tidal = yes" and the other side not tagged but assumed to,
in fact, be tidal. This just introduces an extra arbitrary boundary the
inner end of which again becomes non-tidal.
The American Submerged Lands Act of 1953 does appear to define the line
at which the coastline extends into estuaries etc., but this does not
apply to the UK. That act seems to been precipitated as a result of
disputes over oil drilling rights.
Mike
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