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Oderteich
The Oderteich is an historic reservoir about seven kilometres northeast of Sankt Andreasberg in the Upper Harz in central Germany. It was built by miners from St. Andreasberg in the years 1715 to 1722 and, today, is an important component of the water supply network known as the Upper Harz Water Regale (''Oberharzer Wasserregal''). Moreover, for 170 years, from the time it was completed to the end of the 19th century, the Oderteich had the largest dam in Germany.〔Schmidt, Martin & Teicke, Justus, ''Das Kulturdenkmal Oberharzer Wasserregal'' (2005), Harzwasserwerke, Clausthal-Zellerfeld, August 2005, p. 16 and fig. 13. (PDF )〕〔(''Der Oderteich'' at www.harzlife.de. ) Accessed on 16 Nov 09.〕 The dam lies at a height of by the B 242 federal highway, about a kilometre west of its intersection with the B 4.
==Purpose==
The Oderteich was built in order to be able to deliver a reliable supply of water to the water wheels of the St. Andreasberg mine via the Rehberg Ditch, even during times of drought. Its capacity of 1.7 million cubic metres was, far and away, the largest of all the Upper Harz reservoirs at that time and was enough to cope with periods of low precipitation of up to three months.
Today the water of the Oderteich still drives several hydropower stations within its own valley, at the Samson Pit and in the Sperrlutter valley.
The dam also serves to prevent the regular flooding that happened each year in spring before the dam was built.
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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