In 1899, the Derwent Valley Water Board was set up to supply water to Derby, Leicester, Nottingham and Sheffield, and the two Gothic-style dams were built across the River Derwent to create Howden Reservoir (1912) and Derwent Reservoir (1916).
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The topographical similarity between the Upper Derwent Valley and the Ruhr Valley of Germany led to the dams being used as a practice environment for the Lancaster bombers of the 617 Dam Busters Squadron in 1943 before their attack on the Ruhr dams.
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