A view over the bridge built on top of the dam that seperates Garreg-Ddu and Caban Coch reservoirs in the Elan Valley, Powys, Mid Wales. Built between 1893 and 1904 the reservoirs run to Frankley near Birmingham via the 73 mile long Elan aqueduct, down which the water travels at less than 2 miles per hour, taking one and a half days to get to Birmingham.

A view over the bridge built on top of the dam that seperates Garreg-Ddu and Caban Coch reservoirs in the Elan Valley, Powys, Mid Wales. 

Built between 1893 and 1904 the reservoirs run to Frankley near Birmingham via the 73 mile long Elan aqueduct, down which the water travels at less than 2 miles per hour, taking one and a half days to get to Birmingham.