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There are two different figures for the length of the river in this article. The main text says 66 miles, while the Infobox says 50 miles. Which one is correct? --Drgkl (talk) 14:35, 1 December 2011 (UTC)[reply]
The explanation for some of this is Here but the bottom line says it all. Looking at the maps shows that they have included mill streams as well. Thought I would raise it here first, rather than simply change it. Jokulhlaup (talk) 18:27, 28 February 2013 (UTC)[reply]
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)[reply]
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It is easy however to make one, which I am quite happy to do. I am unsure what exactly you want. From the description it implies- two non-navigable exits- one watered and a second in a tunnel. Is this correct?. In the meantime, just put the bifurcation below the dam icon. ClemRutter (talk) 08:52, 9 September 2018 (UTC)[reply]
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 50 miles (80 km) 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 110.9 kilometres (68.9 mi). 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)[reply]
