Ennepetalsperre

Ennepetalsperre
Location:	Ennepe-Ruhr district
Tributaries:	Ennepe
Larger places nearby:	Breckerfeld , Ennepetal , Radevormwald , Halver
	North Rhine-Westphalia , Germany
Coordinates	51 ° 14 '28 " N , 7 ° 24' 32" E Coordinates: 51 ° 14 '28 " N , 7 ° 24' 32" E
	Data on the structure
Construction time:	1902-1904 / 1909-1912
Height above valley floor:	45 m
Height above foundation level :	51 m
Height of the structure crown:	316.15 m
Building volume:	110,000 m³
Crown length:	320 m
Crown width:	4.5 m
Radius of curvature :	250 m
Power plant output:	0.34 MW
	Data on the reservoir
Altitude (at congestion destination )	307.47 m above sea level NN.
Water surface	103 ha
Storage space	12.6 million m³
Total storage space :	13.03 million m³
Catchment area	48.2 km²
Design flood :	77 m³ / s
	View of the peninsula from the barrier wall

The Ennepetalsperre is located in the southwestern urban area of Breckerfeld in the Ennepe-Ruhr district , about five kilometers northeast of Radevormwald and seven kilometers west of Schalksmühle . It was built between 1902 and 1904 and has a maximum water surface of 103 hectares with a storage volume of 12.6 million cubic meters . The the Ruhrverband belonging dam is used primarily for drinking water , but also the low water levels of the Ruhr and the power generation .

description

The quarry stone wall , built according to the Intze principle according to designs by Otto Intze , has a height of around 51 meters with a crown length of 320 meters and a crown width of 4.5 meters. The dam was raised by around 10 meters between 1909 and 1912, shortly after it was built.

The main flow is the Ennepe . In Hagen this flows into the Volme , which flows four kilometers further into the Ruhr. A front basin and six side basins clean the inflowing water of the Ennepe, Bosseler Bach, Hoster Bach, Borbach and Umbecke brooks from sediments.

An eight-kilometer-long small railway line from the state train station on the Wuppertal Railway in the center of Radevormwald to the dam was specially built for the construction. First exclusively used for material handling, was at the request of the site management quickly from the regional council approval for passenger transport issued since the construction works of a large tourist popularity enjoyed. At the end of the construction period, the railway line was dismantled again.

On the night of May 16-17, 1943, British bombers launched a large-scale attack with special roll bombs on German dams in the so-called Operation Chastise . The Ennepetalsperre was also one of the targets of the attack that night. But because it is hidden and difficult to locate, it was preserved undamaged, while its much larger sisters at Eder and Möhne were hit with devastating consequences.

In 1997 the Ennepetalsperre was taken over by the Ruhrverband.

The dam is extensively fenced in the area of the dam. The root of the reservoir is quite secluded from a traffic point of view, but this is precisely why it is very popular with hikers. It is not possible to walk around the reservoir.

The dam was repaired from 1997 to 2007. It was with a tunnel boring machine in the part of tunneling a patrol by the foundation of the dam ascended . The lower half of the cross-section lies in the natural rock on which the wall stands, the upper half lies in the wall. This required a great deal of technical effort, as the inspection walk had to follow both the curvature of the wall and the profile of the valley in order to always run along the seam between the wall and the ground. The purpose of the inspection is to drain off seepage water that has entered between the wall and the rock and into the wall itself. In this way the sole water pressure of the barrier wall is to be reduced. After the repair, the Krone was closed to previously permitted road traffic.

A hydropower plant has been installed on the Ennepetalsperre since the beginning of 2006 . The existing through-flow turbine has a maximum suction capacity of 1.4 m³ / s. The average annual production is 1.4 million kilowatt hours , which corresponds to the electricity needs of around 400 households. The hydropower plant is operated by the Lister-Lenne power plants in Olpe , a wholly-owned subsidiary of the Ruhr Association.