Solis reservoir
| Solis reservoir | |||||||||
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| Coordinates | 761 368 / 171210 | ||||||||
| Data on the structure | |||||||||
| Lock type: | Arch dam | ||||||||
| Construction time: | 1983-1986 | ||||||||
| Height above foundation level : | 61 m | ||||||||
| Building volume: | 27 000 m³ | ||||||||
| Crown length: | 75 m | ||||||||
| Operator: | Electricity company of the city of Zurich (EWZ) | ||||||||
| Data on the reservoir | |||||||||
| Altitude (at congestion destination ) | 823.75 m above sea level M. | ||||||||
| Water surface | 24 ha | ||||||||
| Reservoir length | 3 km | ||||||||
| Reservoir width | 90 m | ||||||||
| Storage space | 1 460 000 m³ | ||||||||
| Total storage space : | 4th 070 000 m³ | ||||||||
| Catchment area | 900 km² | ||||||||
| Design flood : | 750 m³ / s | ||||||||
| Particularities: |
heavy siltation, diversion tunnels for bed load |
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The Solis reservoir is a reservoir on the Albula below Alvaschein in the canton of Graubünden . The lake with an area of 24 hectares belongs to the Central Grisons power plants . Because of the heavy siltation , the lake was provided with a diversion tunnel for bed load in 2012.
history
The reservoir was built from autumn 1982 to spring 1986 as a day storage facility for the Sils ⊙ and Rothenbrunnen ⊙ power plants . The cost was around CHF 25 million, and around 40 workers were employed on the construction site in two shifts. The dam replaced the old Nisellas river weir, which previously served as the inlet structure of the Rothenbrunnen power plant.
By 2012, about half of the storage volume of 4.1 million cubic meters went through silting lost because the Albula annually about 80 000 cubic meters, sediment deposits in the reservoir. Although around 25,000 m³ were dredged annually through the local gravel works, another solution had to be found because the bottom drains of the dam threatened to clog. For 37 million SFr. A 968 m long sediment discharge tunnel was built, which went into operation in 2012.
Plant diagram of the Mittelbünden power plants
Nisellas weir, which was demolished before the damming
Machine house Sils (EWZ)
Web links
Individual evidence
- ^ Bernhard Andres: Solis . ( swissdams.ch [PDF; accessed on April 27, 2020]).
- ↑ a b Lukas Denzler: A bypass for sediments . In: TEC21 . No. 10/2020 , p. 31 .
- ↑ Solis reservoir must be emptied. In: Southeastern Switzerland. February 15, 2018, accessed April 27, 2020 .
- ↑ The construction of the dam in Solis at the Albula power plant. In: kran-info.ch. Retrieved April 27, 2020 .
- ↑ Candidature UNESCO World Heritage (Ed.): Rhaetian Railway in the Albula / Bernina cultural landscape . Hydroelectric power plants on the Albula River, S. 321 ( rhb.ch [PDF]).
- ↑ Expensive reservoir. In: NZZ. Retrieved April 27, 2020 .