The Kiliansteich (literally "St. Kilian's Pond") is one of the oldest reservoirs in Germany. The reservoir is located near Straßberg (Harz) in the German state of Saxony-Anhalt and supplies drinking water. It impounds the Büschengraben stream. The lake is part of the heritage area (Flächendenkmal) of the Lower Harz Pond and Ditch System.
|Construction began||1610, rebuilt 1989-1994|
|Dam and spillways|
|Height (foundation)||24.6 m (81 ft)|
|Height (thalweg)||22.9 m (75 ft)|
|Length||210 m (690 ft)|
|Elevation at crest||442.23 m (1,450.9 ft)|
|Width (crest)||4 m (13 ft)|
|Dam volume||93,000 m3 (3,300,000 cu ft)|
|Total capacity||1.26×106 m3 (44×106 cu ft)|
|Active capacity||1.19×106 m3 (42×106 cu ft)|
|Catchment area||3.9 km2 (1.5 sq mi)|
|Surface area||17.3 ha (43 acres)|
|Normal elevation||440.5 m (1,445 ft)|
Originally there were four small ponds in a row on the site of the present-day reservoir that had been built for the mining industry. Two of those were broken in 1901 and 1944 and all were in a poor condition. As a result, from 1989-1994 a new, higher dam was built at the site of the lowest dam; the two middle ponds were removed and the upper one, the Upper Kilian Pond (Oberer Kiliansteich), built in 1703, was upgraded into a pre-dam (Vorsperre).
Originally laid as a drinking water reservoir, the lake is used today for flood and drought protection.
The dam on the original "Lower Kilian Pond" (Unterer Kiliansteich) was about 10 m high and had a retaining capacity of 165,000 m³. During the course of renovation the old wooden bottom outlet was salvaged on 25 September 1990 as the result on an initiative by Erika and Siegfried Lorenz. Following long-term conservation work at the Harzwasserwerken in Clausthal-Zellerfeld, who paid for the cost of transports and conservation, it was returned on 19 August 2010 to Straßberg. The wooden raceway is now a museum piece in the Glasebach Pit.
Talsperren in Sachsen-Anhalt, Autorenkollegium, Hrsg. Talsperrenmeisterei des Landes Sachsen-Anhalt 1994
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