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Scammonden Dam : ウィキペディア英語版
Scammonden Reservoir

Scammonden Reservoir is a water reservoir in West Yorkshire, England. The area of the water surface when the reservoir is full is . The level of the bellmouth overflow above sea level is . The reservoir holds 7800 million litres. Its length is .
==History==
Scammonden Dam is part of the M62 motorway between junctions 22 and 23, the only such structure in Britain. Its construction by the Ministry of Transport and Huddersfield Corporation Waterworks required the passing of the Huddersfield Corporation Act 1965. The motorway dam spans the Deanhead Valley in the Pennines between Leeds and Manchester and the main contractor for the project was Sir Alfred McAlpine & Sons.〔Gray, p. 79〕 Deanhead village was submerged and many buildings demolished to make way for the reservoir but the church remains and its vicarage is used by the sailing club.
Surveying began in November 1961 and the route of the carriageway was determined in mid 1963. Excavation in the Deanhead Valley commenced the following year and for the dam in 1966. This required the removal of 713,000 cubic metres of peat bog to reach the solid rock base nearly 13 metres below ground level. Material excavated elsewhere on the line of the motorway, clay from cuttings between Lofthouse and Gildersome, and 3.4 million cubic metres from the Deanhead excavations was used to build the dam's embankment which is 625 metres in length and 63.1 metres above the original valley floor. The 3.6 million cubic metre embankment is 435 metres wide at its base and 55 metres at road level.〔
Scammonden Water is 51.8 metres at its deepest point and water is drawn-off through a 2.5 kilometre tunnel driven southwards to supply Huddersfield. The overflow bellmouth, next to the valve shaft superstructure, discharges water to the valley below via a tunnel in the valley on the reservoir's eastern side. The reservoir started to fill in July 1969 and the area was landscaped and parking and other facilities were provided.〔
The motorway, which was dependent on the completion of the dam, was opened to traffic on 20 December 1970 and officially opened by HM Queen Elizabeth II who unveiled a plaque near the valve tower of Scammonden Water on 14 October 1971.〔

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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