Wörgler Bach
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Wörgler Bach Griesbach |
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 The Wörgler Bach in Wörgl |
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| Data | ||
| Water code | AT : 2-8-238 | |
| location | Tyrol , Austria | |
| River system | Danube | |
| Drain over | Inn → Danube → Black Sea | |
| source | northwest of the Marchbachjoch in the Wildschönau 47 ° 26 ′ 9 ″ N , 12 ° 5 ′ 22 ″ E |
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| Source height | 1184 m above sea level A. | |
| muzzle | in Wörgl in the Inn Coordinates: 47 ° 29 ′ 35 ″ N , 12 ° 3 ′ 18 ″ E 47 ° 29 ′ 35 ″ N , 12 ° 3 ′ 18 ″ E |
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| Mouth height | 498 m above sea level A. | |
| Height difference | 686 m | |
| Bottom slope | 83 ‰ | |
| length | 8.3 km | |
| Catchment area | 20.1 km² | |
| Discharge at the Niederau A Eo gauge : 9.7 km² Location: 6.25 km above the mouth |
NNQ (01.01.2009) MNQ 2006–2012 MQ 2006–2012 Mq 2006–2012 MHQ 2006–2012 HHQ (29.06.2006) |
15 l / s 80 l / s 190 l / s 19.6 l / (s km²) 2.31 m³ / s 4.3 m³ / s |
| Small towns | Worgl | |
| Communities | Wildschönau | |
The Wörgler Bach is an 8.3 km long right tributary of the Inn , which drains parts of the Austrian municipality of Wildschönau and flows into the Inn north of the city of Wörgl . It drains an area of around 20 km².
geography
The Wörgler Bach rises as Griesbach northwest of the Marchbachjoch (also Markbachjoch, 1496 m) below the Marchbachjochhaus in the Gesenkgraben in Niederau . On its way through the anterior high valley it takes on tributaries from Oberau (Wildenbach and Bacher Bach) and the rear Niederau (Marchbach). The remaining area of the Wildschönau community is also drained into the Inn by the Wildschönauer Ache via the Kundler Gorge . The catchment area of around 20 km² is drained by 22 streams and extends over the entire Niederau and thus over the municipality of Wildschönau and the market town of Hopfgarten im Brixental ( Kitzbühel district ). The Marchbach and the Stallnerbach form the current district border and former border to the Duchy of Salzburg (until 1816).
The transport route between the catchment area in the high valley and the confluence in the Inntal valley is handled by the stream over the Wörgler Klamm (also Müllnertal or Mühltalklamm). There are two arch dams in the gorge, the first, 18 m high wall, serves as a weir system for the Müllnertal storage power plant at the gorge exit and creates a storage lake with a volume of 22,200 m³. The water is fed into the system located at the gorge exit via a pressure pipeline (expansion head 102 m, expansion water volume 950 l / s). The 37 m high, double-arched dam, located between the defensive wall and the power station, was the largest torrent barrier in Austria when it opened and protects the city of Wörgl by weakening flood waves and prevents large amounts of sediment from being transported into the city area. The Müllnertal power plant directly at the exit of the gorge is the oldest Wörgler power plant and was opened in 1898. The plant, which was rebuilt in 1957, has an output of around 900 kW. This means that around 2.5 GWh are generated per year, saving around 2,200 tons of CO 2 .
On its last way through the urban area to the mouth, the stream is routed in a natural stone channel for flood protection. This channel prevents the stream from overflowing and is designed for a maximum flood discharge of 35 m³ per second.
geology
While stable Triassic dolomite is to be found in the Müllnertal, red sandstone and Wildschönau slate form the bedrock in the valley. This slate, in particular, is very prone to landslides, is very susceptible to weathering and easily eroded. Therefore, the main torrent activity of the Wörgler Bach lies in its source ditches in the community of Wildschönau. The stable gorge is essentially a transport route through which floods with their bed load are carried away. The alluvial cone gradient is very small - 6% to 9% at the lower reaches - which is why large amounts of bed load cannot enter the Inn without damage. The bottom of the brook floods, which can lead to excessive flanks of the brook bed.
History and Development
Settlement history
As in many places in the Tyrolean Inn Valley, the first settlement activity in Wörgl began on the flat alluvial cone of the Wörgler Bach in the Inntalboden. This offers natural protection from the annual floods of the Inn. Starting from the settlement that emerged along the course of the stream, the village has developed into a town and the size it is today. So it is no coincidence that the Wörgler Bach cuts the city in half and thus also shaped the history of the city. As early as 1416, the Wörgler Bach was designated as the legal border between Kufstein and Rattenberg , with the result that two separate villages developed on both sides of the brook, which became independent in 1864. In 1910 the Association was held these communities Wörgl-Kufstein and Wörgl-Rattenberg, next year, the survey followed this "new" Wörgl to market town by Emperor Franz Joseph I. Its function as a boundary marker, the stream still as the boundary between the cadastral Wörgl- Rattenberg and Wörgl-Kufstein.
Probably the course of the stream from the gorge exit to the Inn gave the village of Wörgl its name. Its straight crossing of the Inntalboden is described with the old regional word "zwerch" ("quer"), from which the name "Twergel" (1390), "Wergel" (probably from around 1515) and finally "Wörgl" developed Has.
In 1908 the first swimming pool of the two Wörgler communities was built on the Wörgler Bach, directly at its exit from the gorge. However, this swimming pool was never really accepted by the population because of the cold water, the shady location and the cool winds from the gorge. Therefore, a new swimming pool was built further northwest in 1927 .
Floods
The flooding activity of the Wörgler Bach can be proven up to the 16th century. Major flood disasters occurred in 1567, 1789, 1821, 1871, 1893, 1894, 1896, 1899, 1901, 1906, 1909, 1941 and 1946. More recently, a severe flood occurred on July 20, 1946, which included the hospital was flooded and silted up by Wörgl. After a prolonged flood in July 1954, 7,000 to 10,000 m³ of bed load had to be dredged and removed from the mouth of the Inn, which cost the municipality 150,000 Schillings (around 10,000 euros ).
Also on July 26, 1994, Wörgl was devastated by a strong flood of the Wörgler Bach. After a huge high weather with hailstorm had occurred in the Wildschönau, there was a sudden increase in the creek. Within a few minutes, the three bed load storage sites in Wildschönau filled up with around 32,000 m³ and the daily storage facility of the Wörgler Stadtwerke filled up with around 23,000 m³ bed load. This was able to alleviate the already huge catastrophe a little. The tidal wave reached Wörgl at around 10 p.m. Due to some wedged trees above the Wörgl city center, the creek dammed up, which caused the masses of water and mud to leave a trail of devastation up to the station area. 71 hectares of urban area were spilled up to half a meter high with around 27,000 tons of mud, the estimated damage was around 60 million schillings (around 4.4 million euros). Because of this disaster, construction work began on a large dam in the Müllnertal and an increase in the flow cross-sections in the city area. The new barrier already proved itself in 2002, since otherwise a flood similar to 1994 would have occurred. In the great flood of 2005 , considerable damage was caused along the Wörgler Bach, because the flood-bearing Inn dammed the Wörgler Bach up to the railway area , thereby affecting an underpass and several houses and allotments in Ferdinand-Raimund-Straße.
Flood protection
After the flood disaster of 1909, construction work with public funds began for the first time. In 1910 and 1911, the lower reaches of the urban area were regulated by the state building authority, and additional work was carried out in 1955. According to the described conditions, the construction of the Wörgler Bach by the torrent and avalanche control extends mainly to the source ditches in the municipality of Wildschönau, where for construction measures to prevent debris formation in the upper reaches, for debris retention and for regulations in the settlement area in the years between In 1958 and 1970 around 7.7 million schillings (around 560,000 euros) were spent. Since all these structures also serve to protect the city, the municipality of Wörgl contributed 3% of the total costs.
Until the systematic barriers in the upper reaches of the river, after the floods of 1945, were built in the gorge for rapid protection for the city at the upper end of the gorge and 200 meters down the valley of the Stadtwerke Tagesspeicher, two vault barriers with a silting area of 22,000 m³ each.
After the floods of 1994, the torrent control began and was completed in 2007. The construction consists of 98 consolidation barriers in the course of the Wildenbach. In the direction of Wörgl there is a rope barrier (middle course) and the most imposing structure of the project, the approximately 36.7 meter high, double-arched arch dam , which is also the highest torrent barrier in Austria. Here, just as much water is passed on through a pipe as the stream bed in the city of Wörgl can hold.
Torrent and Avalanche Control in Tyrol invested 11.55 million euros to protect the population of Wörgl.
Web links
Individual evidence
- ↑ a b c d TIRIS - Tyrolean regional planning and information system
- ^ Ministry for an Austria worth living in (ed.): Hydrographisches Jahrbuch von Österreich 2012. 120th volume. Vienna 2014, p. OG 119, PDF (13.6 MB) on bmlrt.gv.at (yearbook 2012)
- ^ Stadtwerke Wörgl - Renewable Energies - Hydropower. (No longer available online.) Archived from the original on May 21, 2016 ; accessed on May 14, 2016 . 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.
- ^ Emil von Ottenthal, Oswald Redlich: Archive Reports from Tyrol , Volume 4, Vienna 1912, pp. 159, 338 (Church Archive Bad Häring).
- ^ Karl Finsterwalder : The place and field names Wörgl. In: Österreichische Namenforschung , Volume 4, Vienna 1977, p. 3 ff.
