Dam of the Clywedog reservoir
{"Image ImageDescription": "^BClywedog reservoir.^b Dam of the Clywedog reservoir. The reservoir is used for supplying drinking water and preventing floods downstream. Water is not taken from the reservoir directly, but is released from the dam during dry periods to ensure that there is a sufficient supply for pumping stations downstream. During wet weather the dam stores excess water so preventing flooding on the Severn river which lies downstream. Built in 1966, the dam is made of 11 concrete buttresses linked by reinforced concrete beams. At 72 metres it is the highest such concrete mass dam in Britain. The reservoir holds 50,000 million litres of water. Photographed in 1997 near Llanidloes, Wales.", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image YCbCrPositioning": "Centered", "Image Copyright": "Science Photo Library"}