Gruonbach

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Gruonbach
Gruonbach with constructions next to the settlement on the alluvial fan, road bridge, railway gallery.

Gruonbach with constructions next to the settlement on the alluvial fan, road bridge, railway gallery.

Data
location Canton of Uri ; Switzerland
River system Rhine
Drain over Reuss  → Aare  → Rhine  → North Sea
source West of the Hüenderegg
46 ° 54 '34 "  N , 8 ° 40' 36"  O
Source height approx.  1788  m above sea level M.
muzzle near Flüelen in Lake Lucerne Coordinates: 46 ° 54 ′ 58 ″  N , 8 ° 37 ′ 21 ″  E ; CH1903:  690.17 thousand  /  196 798 46 ° 54 '58 "  N , 8 ° 37' 21"  O
Mouth height 434  m above sea level M.
Height difference approx. 1354 m
Bottom slope approx. 27%
length 5 km
Catchment area 8.32 km²
Discharge at the estuary
A Eo : 8.32 km² 		MQ
Mq
 		530 l / s
63.7 l / (s km²)
Communities Flüelen
Early stream barriers on the Gruonbach.

The Gruonbach is a 5 kilometer long right tributary of the Reuss with its confluence with the Urnersee in the Swiss canton of Uri .

course

The stream rises in the Gruontal, a deeply cleared erosion valley west of the Hüenderegg and north of the Eggberge in the area of ​​the municipality of Flüelen . He collects the water of small tributaries in the valley, especially the Bodmibachs, the reduced flows from the high-altitude Alp Nice Chulm below the Siwfass and several gullies the water from the steep slopes below the Rophaien receives. In the wooded valley area of ​​Chalt Brunnen, spring streams flow into the stream from the northern slope below the Gruonberg or the Eggberge near the hamlet of Gruonbergli. After the narrow gorge between the alpine pastures Gibel and Unter Urmis, the Gruonbach reaches the eastern shore of Lake Lucerne , where after the Ice Ages it created a large alluvial fan with the debris on which the Usserdorf district of Flüelen is located.

geology

While on the northern flank of the Gruontal from the Axenfluh on Lake Lucerne to the Rophaien there is a mighty, exemplary sequence of limestone scales and layers of the folded Helvetian Limestone Alps , the southern slope of the valley shows a geological peculiarity. The summit on this side of the valley forms the last remnant of a rubble fan that was piled up by primeval rivers at the edge of a sea during the formation of the Alps , which was later compacted into a compact rock mass. The material, known as the Gruontal conglomerate, is one of the distinctive guiding rocks of the former Rhone glacier and, due to its occurrence in its terminal moraines, allows the determination of historical glacier positions.

Natural hazards

The Gruonbach causes strong deep and side erosion in its channel and, after heavy rainfall, repeatedly causes floods and debris flows . Johann Jacob Leu's chronicle tells of the destruction of a village in Wyler when the brook flooded. To further damage in residential areas and on the roads on the lake shore, especially the Gotthard rail to prevent the canton of Uri, together with the Gotthard Railway Company in Gruontal since the 19th century Bach barriers performed. In the entire channel above the village, numerous torrent barriers have been built into masonry and partly with wood from the Gruonwald, and a diversion structure has been built on the alluvial cone. The new creek bed is located in the Rüti settlement on a gallery of the railway line (1882 construction of the old Gruonbach gallery, 1943 construction of the new Gruonbach gallery for the double lane Flüelen fountain ), while the Axenstrasse crosses it with a bridge.

tourism

Facilities for various water sports are available at Gruonbachstrand. The lake is particularly suitable for windsurfing and kite surfing at this point.

Hydropower

The canton of Uri is considering the construction of a small hydropower plant on the Gruonbach.

literature

  • Max Oechslin: The Gruonbach in the canton of Uri. 1935.

Web links

Individual evidence

  1. ↑ a b c d Geoserver of the Swiss Federal Administration ( information )
  2. ↑ Modeled mean annual discharge. In: Topographical catchment areas of Swiss waters: area outlets. Retrieved August 16, 2016 .
  3. ↑ tributaries.
  4. ↑ René Hantke: Tectonics of the Helvetian Limestone Alps between Obwalden and the St. Gallen Rhine Valley. In: Quarterly publication of the Natural Research Society in Zurich 1961, pp. 1-210, pp. 84ff. (PDF)
  5. ↑ J. Schumacher: On the origin of the gravel in the Gruontal conglomerate. In: Communications from the Natural Research Society Bern 1950, pp. 40–45.
  6. ^ Johann Jacob Leu: General Helvetisches… Lexicon. Volume 19. Zurich 1764, p. 490.
  7. ↑ Torrent control. ( Memento of the original from August 8, 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. (PDF). @1@ 2Template: Webachiv / IABot / www.porr.ch
  8. ↑ Kitesurfing Lake Uri.
  9. ↑ Alpiq EcoPower AG: Canton Uri. Small hydropower projects. Preliminary study. Bern 2009.