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DAMBUSTERS TESTING DAM, ELAN VALLEY WATER SCHEME

Site Details


NPRN 408280

Map Reference SN96SW

Grid Reference SN92196348

Unitary (Local) Authority Powys

Old County Brecknockshire

Community Llanwrthwl

Type of Site DAM

Broad Class Water Supply and Drainage

Period Post Medieval

Site Description Nant-y-Gro dam was a small gravity dam built during the construction of the Elan Valley Water Scheme (nprn 96459) between 1893 and 1904 to supply water to the workmen's village below and was abandoned on completion of the Scheme. It was used in 1942 for Dr. Barnes Wallis' secret tests during the development of the 'bouncing bomb' used to attack dams in Germany during the Dambusters raids. The test explosion left the dam with a large break in its centre measuring 19m wide and 8m high; the two remaining ends of the dam wall stand to their full height of 11m.
Source: Cadw scheduling description.
RCAHMW, 04 March 2011.

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