On the same trip in the Peak District, we visited Ladybower Reservoir, a little further down from Derwent Reservoir. It’s a large reservoir, so it doesn’t often overflow, but when it does, two enclosed bell mouth overflows (plug holes!) take the water from Ladybower and send it into other streams and the River Derwent. Usually these plugholes are well out of the water (we often check!), so we had to take advantage when the water level rose high enough. They are quite an arresting sight, and definitely worth viewing if you are there in the right conditions. Ladybower itself has an interesting history, as underneath it are the ‘lost villages’ of Derwent and Ashopton which were submerged in the 1930’s. Apparently, the remains of the Derwent village are sometimes visible in drought conditions, but not since 2003, when I didn’t have a camera or a car!