https://en.wikipedia.org/wiki/Markeaton_Brook suggests This culvert takes the brook beneath the centre of Derby, where it flows under the Strand, Victoria and Albert Street, to an unseen confluence of the Bramble brook. It crosses beneath the Morledge, before it finally re-emerges from the culvert into the Mill Fleam at the Cockpit island, and then runs alongside the Bass recreation ground, until it reaches the River Derwent.[3][4]
I've seen pictures of the culvert during road works https://www.derbytelegraph.co.uk/news/derby-news/heated-debate-rages-over-idea-7416863 https://www.flickr.com/photos/comradethompski/albums/72157606912868417/
