Talk:River Derwent, Derbyshire

message: The article infers that Arkwright's Cromford Mill was powered by the Derwent. Whilst it may be in the Derwent Valley I understand that it used the Bonsall Brook/Cromford Sough for power. Jokulhlaup (talk) 18:54, 26 February 2013 (UTC)
replies: text: True. Do you want to change it then? The only ref I have at hand is the tourist board leaflet- do you haqve a better one? --ClemRutter (talk) 09:36, 27 February 2013 (UTC)
replies: text: Have changed it and added some additional info and refs. Reading the reference, I can see why the issue came up.  Jokulhlaup (talk) 18:08, 28 February 2013 (UTC)
thread_title:  Mills 

message: Hello fellow Wikipedians,
I have just modified 7 external links on River Derwent, Derbyshire. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20111002181224/http://www.derbyshirewildlifetrust.org.uk/files/Otter%20factsheet.pdf to http://www.derbyshirewildlifetrust.org.uk/files/Otter%20factsheet.pdf
*Added archive https://web.archive.org/web/20110615054530/http://www.derby.gov.uk/NR/rdonlyres/4B80BC1B-99DF-4BDD-8ACA-5C7E89EBE579/0/riversidequarter_co.pdf to http://www.derby.gov.uk/NR/rdonlyres/4B80BC1B-99DF-4BDD-8ACA-5C7E89EBE579/0/riversidequarter_co.pdf
*Added archive https://web.archive.org/web/20110615054545/http://www.derby.gov.uk/NR/rdonlyres/0AD93F8C-83B7-42C6-82F3-A952D9A2FBFB/0/lowerderwent_co.pdf to http://www.derby.gov.uk/NR/rdonlyres/0AD93F8C-83B7-42C6-82F3-A952D9A2FBFB/0/lowerderwent_co.pdf
*Added archive https://archive.is/20120524174208/http://www.derwentvalleymills.org/history/history-and-development/96-why-the-derwent-valley to http://www.derwentvalleymills.org/history/history-and-development/96-why-the-derwent-valley
*Added archive https://archive.is/20120730152428/http://www.arkwrightsociety.org.uk/ to http://www.arkwrightsociety.org.uk/
*Added archive https://web.archive.org/web/20131005122236/https://eplanning.derby.gov.uk/acolnet/DocumentsOnline/documents/24094_15.pdf to http://eplanning.derby.gov.uk/acolnet/DocumentsOnline/documents/24094_15.pdf
*Added archive https://web.archive.org/web/20140224035512/http://data.gov.uk/dataset/wfd-surface-water-classification-status-and-objectives to http://data.gov.uk/dataset/wfd-surface-water-classification-status-and-objectives
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thread_title:  External links modified 

message: Drgkl and Jokulhlaup had a conversation a few years ago about the correct figure for the length of this river. The figure presented now is cited back to the Peak District National Park Authority, a responsible body but we don't know where they found the figure and can put no faith in it, as with so many UK river figures. Well, I too looked at the figure of  currently given and, as with numerous other watercourses where dubious lengths have been asserted, I assiduously measured its length on online 1:25,000 scale OS mapping using a digital tool (wheresthepath) and determined it at . I'd be confident of the accuracy of the figure to within 1% - but with caveats: I began with the furthest reach of the longest headwater stream at Swains Moss at SK 1299 9667 and headed on down, taking a smoothed centre-line through the succession of reservoirs. It's a mostly straightforward if slow process of measuring stretch by stretch but becomes more troublesome downstream of Derby where three or four alternative route choices can be made as meander loops have been cut through and both old and new lines are labelled as 'River Derwent'. Taking the longer line in each case provides the figure I give. Take each of the shorter routes and you shave 4.2km off the total, giving 106.7km - some subjectivity can creep in around this. 
As I've said elsewhere, this is of course original research on my part so cannot be included in the article but it does at least give an idea of what a true figure should look like if and when an editor finds a suitable reference out there! B.t.w. in this context, the  links helpfully provided by Jokulhlaup no longer work - are there new links you're aware of? cheers Geopersona (talk) 05:29, 10 December 2021 (UTC)
thread_title:  Length - revisited