Wimbleball Lake The Dam Wimbleball Lake on Exmoor in Somerset, England, is a water supply reservoir constructed in the 1970s and completed in 1979. The 161 feet (49 m) high dam is of concrete buttress construction and impounds the River Haddeo to provide a water storage capacity of some 21,000 megalitres over an area of 374 acres (1.51 km2). Aggregate for the dam came from a quarry at Bampton and sand from Uffculme. These were combined to give a pinkish tinge to blend in with the local geology. The tributary valleys include the River Pulham, which passes the village of Brompton Regis and continues to Hartford where it joins the Haddeo.[1]

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