A scale model of the Elan Valley Reservoirs, in the form of ornamental ponds, is located in a Japanese garden near the mac.
It ran through the Elan Valley from a junction near Rhayader on the Mid-Wales Railway.
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The lessons learned from the destruction of the Nant-y-Gro dam culminated in the 1943 Dam Busters raid when RAF Bomber Command used the same principles to breach the dams in the Ruhr Valley.
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