Gigerwaldsee
Gigerwaldsee | |||||||||
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Gigerwaldsee in the Calfeisental | |||||||||
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Coordinates | 747 367 / 197 712 | ||||||||
Data on the structure | |||||||||
Lock type: | Arch dam | ||||||||
Construction time: | 1976 | ||||||||
Height of the barrier structure : | 147 m | ||||||||
Height above the river bed : | 135 m | ||||||||
Building volume: | 460 000 m³ | ||||||||
Crown length: | 430 m | ||||||||
Operator: | KW Sarganserland AG, Pfäfers | ||||||||
Data on the reservoir | |||||||||
Altitude (at congestion destination ) | 1335 m above sea level M. | ||||||||
Water surface | 71 ha | ||||||||
Reservoir length | 3 km | ||||||||
Storage space | 33 400 000 m³ | ||||||||
Total storage space : | 35 600 000 m³ | ||||||||
Catchment area | 52.06 km² | ||||||||
Design flood : | 180 m³ / s | ||||||||
Detailed map |
The Gigerwaldsee is located in the Calfeisental in the area of the political community Pfäfers in the canton of St. Gallen .
Reservoir
The reservoir can be reached via Bad Ragaz through the Tamina valley . The last larger town is Vättis . From there, a mountain road and, on summer weekends, a post bus route lead to the dam wall , which was completed in 1976 and about 400 meters higher . Along the southern shore of the lake, a narrow road leads through some tunnels to the former Walser settlement of St. Martin . The road is closed in winter due to the risk of avalanches. The Gigerwaldsee is the largest lake that lies exclusively in the St. Gallen area.
The Gigerwaldsee is part of the pumped storage plant built by Kraftwerke Sarganserland (KSL) from 1971 to 1977 , a partner plant of the Canton of St. Gallen and Axpo AG . It uses water from the upper Weisstannental and its side valleys, the Calfeisental and the Tamina valley and generates an average of 460 million kilowatt hours of electricity annually.
Technical specifications
Gigerwald dam
Double curved arch dam | ||
Maximum height above foundation | 147 m | |
Crown length | 430 m | |
Minimal wall thickness at the crown | 7 m | |
Maximum wall thickness at the foot | 22 m | |
Height of the wall crown | 1337 m above sea level M. | |
Concrete cubature | 446,000 m³ |
Hydraulic equipment
Mapragg power plant | Sarelli power plant | |
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Turbines | 3 vertical axis Francis turbines | 2 vertical axis Francis turbines |
Turbine power | 93 300 kW each | 45,000 kW each |
rotational speed | 600 rpm | 750 rpm |
Swallowing ability | 25 m³ / s each | 15 m³ / s each |
pump | 3 vertical axis two-stage pumps | |
Pump performance | 53,000 kW each | |
Delivery rate | 8.6 to 11.9 m³ / s each |
photos
Web links
- Lakes in Switzerland: Natural and storage lakes, Federal Office for the Environment FOEN, 2007 ( Memento from October 5, 2008 in the Internet Archive ) → Lakes in Switzerland (PDF)
- Factsheet power plants Sarganserland PDF from AXPO