Barrage du Seujet

Barrage du Seujet
The three weirs of the Barrage du Seujet with the pedestrian walkway
location
Coordinates	499 415  /  117830 coordinates: 46 ° 12 '16 "  N , 6 ° 8' 7"  O ; CH1903:  499,415  /  117830
country	Switzerland
place	Geneva
Waters	Rhone
Height upstream	371  m
power plant
operator	Services Industriels de Genève (SIG)
construction time	1992-1995
Start of operation	1995
technology
Bottleneck performance	8.7 megawatts
Expansion flow	50-550 m³ / s
Standard work capacity	21.1 million kWh / year
Turbines	3 horizontal Kaplan turbines
Others

A segment weir of the Barrage du Seujet

The Barrage du Seujet is a weir and run-of-river power station on the Rhone in Geneva that regulates the water level in Lake Geneva . It is located between the Pont de la Coulouvrenière and Pont Sous-Terre bridges , one kilometer from the end of the lake.

The name comes from the quay du Seujet .

history

The Barrage du Seujet was inaugurated in 1995 after three years of construction. It replaces the old weirs at the Pont de la Machine and the old power station of the Usine des Forces Motrices de la Coulouvrenière , which previously jointly regulated the water level of Lake Geneva. An agreement between the cantons of Geneva , Vaud and Valais was agreed for the construction . The weir, the power station and the lock are operated by the public Services Industriels de Genève (SIG). The city ​​of Geneva is financially responsible for the lock, the public terrace and the jetty. The cantons of Vaud and Valais contribute to the maintenance of the weirs.

Maritime regulation is defined in the inter-cantonal agreement and regulations. The lake level must accordingly be between 371.7  m above sea level. M. and 372.3  m above sea level. M. to be held. In addition, every leap year the lake level at the beginning of spring is 371.5  m above sea level for one month . M. reduced to enable work on the lake shores.

technology

On the left, the system consists of three 13 m wide segment weirs , one of which is part of a 27 m long lock. On the right is the power plant with three Kaplan turbines with a horizontal axis. The total installed capacity is 8.7 MW, the annual electricity production 21.1 GWh. The entire power plant is underground, above which there is a publicly accessible terrace which leads to a footbridge over the overflow weirs. There is also a fish ladder and a beaver ladder .

The Barrage du Seujet is important for electricity production not only because of its own output, but also because of the regulation of the Rhone runoff between 50 and 550 m³ / s in order to adapt the output of the Barrage de Verbois and Chancy-Pougny run-of-river power plants below to the electricity demand during the day . On an annual average, approx. 270 m³ of water flow out of the lake every second.

See also

• List of hydropower plants in Switzerland

Web links

• Brief description on the SIG website (French)
• Description and pictures of the beaver stairs (French)
• Hydrological station Rhone - Geneve, Halle de l'Ile , 500 meters above the Barrage du Seujet located

Individual evidence

1. ↑ Acte intercantonal concernant la correction et la régularisation de l'écoulement des eaux du Léman entre les cantons de Genève, de Vaud et du Valais (French)
2. ↑ Règlement sur la maneuver de l'ouvrage de régularisation du niveau du lac Léman à Genève (French)
3. ↑ Annual production since 1995 by Barrage du Seujet  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.  
4. ↑ Rhone discharge 500 m above the Quai du Seujet , see annual discharge tables