Aldenham Reservoir


Aldenham Reservoir is situated in the parish of Elstree and Borehamwood in Hertfordshire, England, about one mile (1.6 km) to the west of the village of Elstree.
Originally, it was 65 acres (260,000 m) in extent [now 55 acres (220,000 m) after repairs to the dam] and was built by the Grand Junction Canal Company to control the water levels in the River Colne following the construction of the Grand Junction Canal. It was hand dug by French prisoners of war between 1795 and 1797.