Sihlsee | |
---|---|
Location | Canton of Schwyz |
Coordinates | 47°07′N8°47′E / 47.117°N 8.783°E |
Type | reservoir |
Primary inflows | Sihl, Minster |
Primary outflows | Sihl |
Basin countries | Switzerland |
Max. length | 8.5 kilometres (5 mi) |
Max. width | 2.5 kilometres (2 mi) |
Surface area | 11.3 km2 (4.4 sq mi) |
Max. depth | 17 metres (56 ft) |
Water volume | 96 million cubic metres (78,000 acre⋅ft) |
Surface elevation | 889 metres (2,917 ft) |
Settlements | Gross, Willerzell, Birchli, Euthal |
The Sihlsee (in English sometimes called Lake Sihl) is an artificial lake in the Swiss canton of Schwyz, near the town of Einsiedeln. The lake was created by damming the river Sihl and flooding a section of the upper Sihl Valley. [1]
The lake feeds the Etzelwerk power station , which is located 5 kilometres (3 mi) to the north-east in Altendorf on the upper section of Lake Zürich (the Obersee) and which supplies electricity to the Swiss Federal Railways (SBB). Its concrete dam is 33 metres (108 ft) high and 124 metres (407 ft) m long. The lake is the largest artificial lake of Switzerland in terms of surface with a maximum length of 8.5 kilometres (5 mi) and maximum width of 2.5 kilometres (2 mi). The maximum depth is 17 metres (56 ft), and the lake has an approximate volume of 96,000,000 m3 (3.4×109 cu ft).[ citation needed ]
The power plant project started in 1932. A concrete dam and two viaducts over the lake were built before 1937 when the valley was flooded. As a result 107 farms disappeared completely and 1762 persons had to leave their homes. [2]
A failure of the dam could lead, according to studies, to an 8-metre (26 ft) high flood wave through the lower Sihl Valley reaching the Altstadt of the city of Zürich, the biggest city in Switzerland, within 2 hours. This threat has led the City of Zürich to develop, publish and test evacuation plans for the affected areas of the city, and especially the area around Zürich Hauptbahnhof railway station. [3]
The Upper Rhine is the section of the Rhine between Basel in Switzerland and Bingen in Germany, surrounded by the Upper Rhine Plain. The river is marked by Rhine-kilometres 170 to 529.
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The Sihl is a Swiss river that rises near the Druesberg mountain in the canton of Schwyz, and eventually flows into the Limmat in the centre of the city of Zürich. It has a length of 73 km (45 mi), including the Sihlsee reservoir, through which the river flows. Water is abstracted from the river at the Sihlsee, leading to decreased downstream water flows and a consequent reduction in water quality.
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Sihl Valley is a river valley and belongs to the Zimmerberg-Sihltal region located in the district of Horgen in the canton of Zurich, Switzerland. Commonly Sihltal is used as the name of the Lower Sihl Valley, i.e. the area in the southwest of the city of Zürich.
Adlisberg, with an elevation of 701 metres (2,300 ft), is a wooded mountain in Switzerland overlooking Zürichsee to the northwest near the Zürichberg.
Flood Disaster is a 1977 Swiss short by Roger Steinmann. The film was labeled ‘Switzerland's first disaster movie' as depicting a major water dam-break with the subsequent flooding of the metropole of Zurich.