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Fürstenteich
The Fürstenteich is a reservoir near Silberhütte in the German state of Saxony-Anhalt. It has an earth-filled dam with an impervious core. It impounds the Teufelsgrundbach stream.
== Construction ==
The dam was based on sedimented shale and has an internal impervious core of organic clays (grass sods). During renovation work about 70 cm of the surface layer on the old downstream face was removed and replaced by layers of shale material. That was covered with a 10 cm thick layer of topsoil sown with grass seed. On the upstream side, 60 cm was removed and on a 30 cm thick layer of stone chippings a similarly thick protective layer of ballast. The dam was also raised in height by about 1 metre. After removing 90 cm of the old dam crest, a metre-wide toe wall was integrated from the subgrade (''Planum''). This extends as far as the cohesive earth material of the old dam core.
The old wooden outlet channel (''Striegelgerinne'') is still there, but no longer functioning. It has since been linked to the seepage water measurement shaft (''Sickerwasser-Messschacht'') by a steel pipe. During the construction phase in 1903/04 a cast iron siphon pipe was laid, which crossed the spillway. The siphon pipe has a vent in the concrete ring on the dam crest. In 1990 the cast iron ring was cut by the spillway and has since emptied via a new outlet into the plunge pool of the spillway. The spillway consists of a reinforced concrete channel with 18 sections. Its total length is about 95 m.
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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