Bobertalsperre

Bobertalsperre
	Dam wall, valley side
Location:	Lower Silesia , Poland
Drain:	Bober
Major cities nearby:	Jelenia Gora
	Lower Silesia , Poland
Coordinates	50 ° 58 ′ 0 ″ N , 15 ° 39 ′ 0 ″ E Coordinates: 50 ° 58 ′ 0 ″ N , 15 ° 39 ′ 0 ″ E
	Data on the structure
Construction time:	1904-1912
Height above valley floor:	50 m
Height above foundation level :	62 m
Building volume:	250,000 m³ (260,000 m³?)
Crown length:	280 m
Crown width:	7.2 m (7.5 m?)
Radius of curvature :	250 m
Power plant output:	7.585 MW
	Data on the reservoir
Water surface	240 ha
Storage space	50 million m³
Catchment area	1078 (or 1210 km²?)

The Bobertalsperre ( Polish Jezioro Pilchowickie ), also called Bobertalsperre Mauer , Dam Wall or Mauertalsperre after the nearby town of Pilchowice , was built on the Bober from 1902–1904 to 1911–1912 for the purpose of flood protection and power generation .

It is located northwest of Hirschberg (Jelenia Góra) in today Polish part of the Giant Mountains in Silesia .

Through the structure, the Bober river forms a reservoir about 4 km in length. The closest places are Pilchowice (Wall) and Wrzeszczyn (Boberullersdorf). The dam is located on the territory of the municipalities of Wleń (Lähn) and Jeżów Sudecki (Grunau).

Hydroelectric power plant

The Francis-type turbines were supplied by Voith from Heidenheim and the generators by Siemens-Schuckert and AEG .

In the 1920s, the power plant was connected to the Queis dams Marklissa and Goldentraum and the Weistritz dam near Breitenhain via high-voltage lines of 10, 30 and 40 kV , so that a regional network was created in Lower Silesia for the first time. Most of the power lines laid on steel lattice masts still exist today.

The power plant is operated by Tauron Ekoenergia sp. z oo operated. In 2014 the turbines and generators were renewed. The 6 hydraulically controlled Francis turbines come from the company ZRE Gdańsk SA, No. 5 is partly Voith. Turbines No. 1 to 4 have an installed line of 2.26 megawatts (MW) each, No. 5 has 3 MW and No. 6 1.2 MW. The generators No. 1 to 4 and No. 6 come from DFME Sp. Z oo, No. 5 comes from AEG.

The six turbines generate around 20 million kWh of electrical energy per year. According to the information on the display board on the dam, the total nominal output is 7585 kW.

The dam

When it was completed, the Bobertalsperre Mauer was the largest dam in Europe. In terms of height and storage space, it exceeded the Urft Dam in the Eifel that had recently been built . The dam is a curved gravity dam according to the intce principle . The building material is quarry stone masonry and the building ground consists of gneiss .

The Bobertalsperre was built by the construction company B. Liebold & Co. AG ( Holzminden / Berlin ) under the direction of chief engineer Albert Cucchiero. The construction costs amounted to 5.7 million marks for the dam and 2 million marks for the power plant with the pipeline network.