[OHM] tagging historical waterways

[SK53]

I can't think of anything major, other than one can end up with a hell of a
lot of ancient channels.

Here are a couple of other examples where I know some historical data on
former channels exists:

There are many known ancient channels of the Trent around Nottingham
(roughly in historical times) and there must be 20 or so at least. Some are
obvious on old boundaries, for instance in a map of 1835 Attenborough
parish included land as far as Holme Pit, and the old Wilford parish
boundary followed Wilford Crescent East not the Trent. Prior to
rationalisation of the city boundary Nottingham included patches of land on
the S side of the Trent east of Trent Bridge (hence explaining the curious
anomaly that the football ground is called the City Ground). I dont know if
the latter are paleochannels. Further east the lakes in Colwick Park are
former meanders of the Trent which were bypassed when the Holme Cut was
made. There seems to be intensive archaeological research on palaeochannels
in the Trent Valley (for instance
http://archaeologydataservice.ac.uk/archiveDS/archiveDownload?t=arch-830-1/dissemination/pdf/baker_2002_palaeochannels.pdf).
I've seen photographs of an early mediaeval fish weir constructed from
basket work which was uncovered in the Aston Gravel workings (unfortunately
it wasnt preserved). The problems with this type of data are: a) dating
particular channels; b) what to map, as there must be intermediate stages.
I could have a go at mapping the obvious alterations between 1835 and the
present.

About 15 years ago the National Geographic had an article (probably this one
<http://ngm.nationalgeographic.com/static-legacy/ngm/0204/feature5/fulltext.html>)
about the Missouri had changed since the time of Lewis & Clark.

Jerry



On 21 March 2017 at 22:10, Richard Welty <rwelty at averillpark.net> wrote:

> i'm in a position to provide some older channels for the Hudson
> River near Albany that are largely gone now, mostly filled in when
> I 787 was built along the west side in the 1960s and 1970s.
>
> before i start, i'm looking for advice on tagging. anyone have any thoughts
> on this besides the usual end_date stuff?
>
> richard
>
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