Staufensee reservoir

Staufensee reservoir
	Staufensee, view towards NNE on "Hut" (on the outlet structure) and - hardly recognizable in the shadow - a dam wall a piece to the right of it and behind it
Geographical location	Vorarlberg
Tributaries	Dornbirner Ah , Ebniterach
Drain	Dornbirn Oh
Places on the shore	Dornbirn
	Data
Coordinates	47 ° 22 '50 " N , 9 ° 46' 42" E Coordinates: 47 ° 22 '50 " N , 9 ° 46' 42" E
Altitude above sea level	590 m above sea level A.
surface	6.4 ha
length	0.4
width	0.16
particularities	high input of alluvial material - risk of silting up

Staufensee middle.

The Staufensee reservoir ( Staufensee for short , 590 m above sea level ) is an artificial reservoir and short-term storage with around 120,000 to 130,000 m³ of usable volume (1992). This corresponds roughly to the mean water discharge of the Ebniter Ache in one day.

Name derivation

The name of the Staufensee is named after the mountain Staufen ( 1465 m above sea level ), which rises above it. The name of the Staufen can be derived from the Old High German stouf , the name of a conical elevation, or from Middle High German ("stouf") in the sense of a "steep rock".

history

After the flood of July 15, 1824 in Dornbirn had impressively demonstrated the need for flood protection structures on the Dornbirner Ache , a gravel barrier ( dam ) was built between 1828 and 1834 on the site of today's dam . This gravel barrier was destroyed by another flood in 1891 and in 1893/1894 the barrier was rebuilt in the form of a vaulted dam / arch dam with a height of 12 m as Cyclops masonry made of large stones.

The reservoir cooperative was founded on May 7, 1897.

In the years 1897 to 1899 the dam wall was reinforced again and increased to 21 m. At the same time, the Ebensand power plant was built.

In 1900, the reservoir cooperative received an operating permit for an initial period of 60 years and on June 17, 1901, the operating permit.

In 1901 the bottom outlet of the reservoir was relocated due to flooding due to alluvial material and could only be exposed again in 1977.

Geography / hydrology

Tributaries

Several natural and artificial tributaries flow into the Staufensee. The water for the Staufensee reservoir comes from the residual water from the Ebensand power plant, the Älpelegraben, the Dornbirner Ache, the Tüfgraben and the Trestorengraben.

Drains

Originally, the energy from the Staufensee was also used via a pressure line for the FM Hämmerle factories in Gütle . The pressure pipelines were led through the Rappenloch Gorge adjoining the reservoir and still exist today.

Part of the water from the Staufensee is drained via the continuation of the Dornbirner Ache through the Rappenloch Gorge.

The dam itself has a bottom outlet and a central outlet. On the left side there is a circulation channel for the flood drainage. An 84 m long tunnel with an 11% gradient on the western side of the dam serves to flush the reservoir and could originally also be used to provide the water for wood foundations .

Position and extent

The Staufensee is about 1.3 km as the crow flies from Gütle, and about 4.5 km from the city center of Dornbirn. The lake itself is a maximum of 400 m long and 160 m wide at the highest storage destination. It is divided into the Vordersee (near the dam) and the Hintersee (to the Ebensand power station).

geology

The Staufensee lies in a flat hollow between the Alploch and the Rappenloch. Due to the limestone with marl inclusions ( Helvetic system ) lying in the flow area of the Ebniter Ache, large amounts of sludge arise from the crushing of the marl by the water, which are carried away by the Ache and, among other things, settle in the Staufensee together with biogenic substances (e.g. Branches). This would quickly lead to the silting up of the reservoir if no appropriate measures were taken. In the 1970s, the Staufensee was rehabilitated by the Hämmerle company and in 1977 the bottom outlet blocked by floating debris was exposed again.

Due to the now reduced possibility of drainage due to the rock fall in the Rappenloch on May 10, 2011 and the increase in the level of the water flow in this part of the Rappenloch Gorge associated with the rock fall, normal discharge of the alluvial material from the reservoir is currently no longer possible due to flooding, which threatens to silt up the reservoir in a few years. This would have a direct impact on the functioning of the Ebensand power plant.

Technical specifications

Storage volume: 0.13 million m³
Height of the dam wall: 22 m
Width of the dam base: 9.6 m
Width of the dam crest: 3 m
Construction of the dam: Vault dam in the execution of Cyclopean masonry
Congestion destination : 592 m above sea level A.
Lowering target : 586 m above sea level A.
Spiking water volume (1995): 50 l / s
actual leakage water volume (1995): 170 l / s

property

The dam or dam was built by the Staufensee reservoir cooperative . The owners of the reservoir cooperative were originally the cooperative members of the Müllerbach , who had a special interest in an even water doping of the Dornbirner Ache, as well as the FM Hämmerle company with its textile factory in Gütle and the JA Winder company ( in the ground - now a restaurant).

Power plants

Ebensand power station

The construction of the Ebensand power station in 1898/1899 on behalf of the Dornbirn municipality meant that the Staufensee dam had to be reinforced and renewed. Previously, this Staufensee reservoir was only used to regulate the water flow rates of the Dornbirner Ach in order to support the drifting of wood and the management of the Müllerbach. When the feed tunnel for the Ebensand power station was knocked through in October 1898, the renewed and now 21 meter high dam of the Staufensee was also completed.

Staufensee hydropower plant

At the foot of the dam, the private small hydropower plant Staufensee of the Kleinwasserkraftwerk Staufensee GmbH was put into operation in 2004 .

Tourist use

After the damming of the Staufensee began in 1900, it was also used for boat trips (gondola rental).

The Staufensee Reservoir is one of thousands visited annually recreation area, the destination point for the walk through the Rappenlochschlucht , Ammann bridge or from the Karrenseilbahn -Bergstation and starting point for the walk through the Alplochschlucht and Kirchle and after Ebnit .

There is a separate Postbus stop above the reservoir (stop: "Rappenlochbrücke").

literature

Martin Trunk: Functional consideration of the Müllerbach and the resulting consequences of an endowment of the Dornbirner Ache . Thesis at the University of Natural Resources and Life Sciences, Vienna, Dipl.-Arb., 1992.
Franz Josef Huber: The Dornbirner Gütle: on the wild water; from the FM Hämmerle spinning mill through the Rappenloch to the Staufensee. Bucher Verlag, Hohenems 2014, ISBN 978-3-99018-266-6 .
Franz Josef Huber: The Staufensee in Dornbirn-Ebensand . In: Montfort. Quarterly magazine for the past and present of Vorarlberg . 35th year, 1983 issue 4, ISBN 3-85430-034-4 , p. 344–353 ( full text on ANNO - AustriaN Newspapers Online ).

Web links

The Staufensee in Dornbirn-Ebensand by Franz Josef Huber.
Green electricity from our own small power plant (Vorarlberg Online).

Individual evidence

↑ Vorarlberg water code number: 29519
↑ Martin Trunk: Functional consideration of the Müllerbach and the resulting consequences of an endowment of the Dornbirner Ache. 1992, p. 49.
^ Beat Zehnder: The community names of the canton of Aargau. In: Historical Society of the Canton of Aargau (Ed.): Argovia. Volume 100, Verlag Sauerländer, Aarau 1991, ISBN 3-7941-3122-3 , pp. 407-408.
^ Franz J. Huber: The Dornbirner Gütle: am wild water; from the FM Hämmerle spinning mill through the Rappenloch to the Staufensee. 2014, p. 15.
^ Members of the cooperative: FM Hämmerle , JA Winder and the former members of the Müllerbach cooperative .
^ Franz J. Huber: The Dornbirner Gütle: am wild water; from the FM Hämmerle spinning mill through the Rappenloch to the Staufensee. 2014, p. 121.
^ Franz J. Huber: The Dornbirner Gütle: am wild water; from the FM Hämmerle spinning mill through the Rappenloch to the Staufensee. 2014, p. 178 ff.
↑ Martin Trunk: Functional consideration of the Müllerbach and the resulting consequences of an endowment of the Dornbirner Ache. 1992, p. 12.
↑ Listed property, ID: 3460.

[1] Vorarlberg water code number: 29519

[2] Martin Trunk: Functional consideration of the Müllerbach and the resulting consequences of an endowment of the Dornbirner Ache. 1992, p. 49.

[3] Beat Zehnder: The community names of the canton of Aargau. In: Historical Society of the Canton of Aargau (Ed.): Argovia. Volume 100, Verlag Sauerländer, Aarau 1991, ISBN 3-7941-3122-3 , pp. 407-408.

[4] Franz J. Huber: The Dornbirner Gütle: am wild water; from the FM Hämmerle spinning mill through the Rappenloch to the Staufensee. 2014, p. 15.

[5] Members of the cooperative: FM Hämmerle , JA Winder and the former members of the Müllerbach cooperative .

[6] Franz J. Huber: The Dornbirner Gütle: am wild water; from the FM Hämmerle spinning mill through the Rappenloch to the Staufensee. 2014, p. 121.

[7] Franz J. Huber: The Dornbirner Gütle: am wild water; from the FM Hämmerle spinning mill through the Rappenloch to the Staufensee. 2014, p. 178 ff.

[8] Martin Trunk: Functional consideration of the Müllerbach and the resulting consequences of an endowment of the Dornbirner Ache. 1992, p. 12.

[9] Listed property, ID: 3460.