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Llyn Eigiau
Llyn Eigiau is a lake on the edge of the Carneddau range of mountains in Snowdonia, Gwynedd, Wales. The name ''Eigiau'' is thought to refer to the shoals of fish which once lived here. Early maps refer to it as ''Llynyga''. It is thought that a small number of Arctic char exist in the lake (as they do in neighbouring Llyn Cowlyd) after they were transferred here from Llyn Peris, and certainly it is one of the few lakes in Wales to have its own natural brown trout.
==Dam==
In 1911 a dam ¾ mile long and high was built across part of its eastern side to supply water for the power station at Dolgarrog, which in turn provided power for the adjacent aluminium works. Materials for the dam were transported along the newly laid Eigiau Tramway, which ran from Dolgarrog and utilized the route of the former Cedryn Quarry Tramway. The original contractor pulled out of the construction, alleging corner cutting, and indeed on 2 November 1925, following of rain in just five days, the dam broke. The water flowed down to Coedty Reservoir, also causing that to burst, and millions of gallons of water flowed down into the village of Dolgarrog, causing the loss of 17 lives. A new power station was built at Dolgarrog in 1925. Three short black and white silent films of the incident can be seen here.() A study of the dam today shows that indeed the foundations were quite insufficient, and large lumps of unmixed cement can also be seen. The dam material that can be seen through existing holes is flaky and tends to break away easily.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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