Bear Lake (Wertach)
| Bear Lake | |||||||||||
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| Coordinates | 47 ° 51 '40 " N , 10 ° 38' 39" E | ||||||||||
| Data on the structure | |||||||||||
| Construction time: | 1955-1956 | ||||||||||
| Height of the barrier structure : | 684 m | ||||||||||
| Power plant output: | 2 × 765 kW | ||||||||||
| Data on the reservoir | |||||||||||
| Water surface | 54 ha | ||||||||||
| Total storage space : | 1.5 million m³ | ||||||||||
The Bärensee is a reservoir of the Wertach . It is located a little south of Kaufbeuren between Hirschzell and Biessenhofen on the corridor of the city of Kaufbeuren and the Ostallgäu district. The dam is at river km 73.3. The shorelines of the lake are largely based on the original course of the river, which used to run in sweeping loops at this point. The lake is an average of 12 meters deep, 25 meters at its deepest point, and is largely located in the Bachtel- and Bärensee nature reserve .
The name of the lake comes from the flooded bear forest, under which there were pastures for breeding boars, which were called "Ber" or "Beern" in the Swabian dialect.
history
The lake was dammed in 1956 by the Kaufbeurer spinning mill Momm for the "Hirschzell power plant" in order to meet the factory's growing energy needs. Alluvial forest areas and the so-called bear forest were flooded. The construction of the lake was controversial at the time, as the floodplain forest areas were flooded with many rare plants. The lake could not be realized in its full size due to disputes with the landowners. A semi-fossil oak trunk found during the construction of the lake is now a carved work of art in the St. Magnus Church in Marktoberdorf . In 1996, VWEW bought the power plant and lake from the Momm spinning mill.
After the power plant was taken over, extensive renovation and renewal work was carried out, which was completed by 2012. The following were detailed:
- 1997 Renewal of the switchgear
- 1998 Renewal of the trash rack cleaning system
- 1999–2000 renovation of the weir systems
- 2006 Construction of a warehouse for emergency closure dam boards
- 2008 Renovation of the building, installation of a PV system on the roof
- 2009–2010 Concrete renovation in the power plant area
- 2010 renovation of turbine inlet and turbines
- 2012 New construction of a 300 meter long fish ladder
meaning
The lake is a well-known local recreation area and is used for fishing and sailing. Due to the still very poor water quality of the Wertach and the over-fertilization by the adjacent agriculture, the lake is highly eutrophic and only suitable for bathing to a limited extent. Corresponding warning signs on the lake were renewed by the city of Kaufbeuren in 2008. Since 2009, large parts of the lake have been planted with herbs on a regular basis; in September 2014, the harvest was first carried out with the help of a special boat.
A large number of water birds live at the lake, and the beaver has also been at home again for some time .
power plant
The hydropower plant's turbines are designed for a maximum flow rate of 12.5 m³ / s each, and up to 14 m³ / s each when overopening. Any additional water flows off through two 11 meter wide barrage weirs with a shared lower segment lock and two individually controllable fish belly flaps at the top. The flaps and segment lock are each 2.5 meters high. Two identical, automatically controlled Kaplan turbines , which were built in 1955 by the Voith company, are installed in the power plant's nacelle . The turbines rotate at 275 revolutions per minute, two three-phase synchronous generators of the AEG E-85 type are driven at 600 min −1 via a bevel gear . The electrical output is 765 kW per generator when the turbine is 100% open, and a maximum of 840 kW when overopening. The power plant has an annual output of around 6 million kWh.
See also
Individual evidence
- ↑ a b VWEW customer newspaper 11/09 (PDF file) ( Memento of the original dated August 6, 2010 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Fish ladder at Kaufbeurer Bärensee completed. VWEW has completed bypass channels for animals at the Bärensee power plant in Hirschzell. (No longer available online.) September 4, 2012, archived from the original on September 8, 2012 ; retrieved on September 17, 2012 : “For more than 50 years, the end of every fish migration at the northern Bear Lake. Because there a power station with a weir stopped the fish's urge to move. That has now changed: The United Wertach-Elektrizitätswerke (VWEW) built a 300-meter-long fish pass there. ” Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ http://www.vwew-energie.de/images/Sammelmappe_FAH.pdf ( 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.
- ↑ Archived copy ( Memento of the original from March 5, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ http://www.vwew-energie.de/unternehmen/unsere-kraftwerke/wasserkraftwerke/69 ( 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.
