Talk:Elan Valley Reservoirs
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Fixed the mistake regarding the Nant-Y-Gro dam - this was used by Barnes Wallis as a testing ground for a smaller version of his "bouncing bomb", which was suspended against the dam face on the water side (rather than being fired along the reservoir or dropped by aeroplane).
Nant Y Gro was intended as a reservoir to supply the village built for the workmen building the Elan Valley reservoirs - as the original project had been completed by WW2 Nant Y Gro was surplus to requirements and therefore ideally suited to Barnes Wallis' requirements. If travelling along the Elan Valley by car from Rhayader, you can just catch a glimpse of the remains shortly after passing the Caban Coch dam (the first one, above the visitors centre). I won't advocate attempting to drive along there while looking out of the side window as it's a narrow road with a rockface on one side and a deep reservoir on the other, but if your passenger looks out across the reservoir they'll see a small inlet on the far side, with ample tree cover. That's the site of the Nant Y Gro dam, and with a suitable zoom lens or spotting scope you can just about see the remains of the wall.