Laui (Giswil)
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Laui Gross Laui, Giswiler Laui, Lauibach |
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 Laui |
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| Data | ||
| Water code | CH : 812 | |
| location | Canton of Obwalden ; Switzerland | |
| River system | Rhine | |
| Drain over | Sarner Aa → Reuss → Aare → Rhine → North Sea | |
| confluence | from Rohrgraben and Unterwengengraben at Rinderalp 46 ° 50 ′ 11 ″ N , 8 ° 6 ′ 28 ″ E |
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| Source height | 1071 m above sea level M. | |
| muzzle | near Giswil in the Sarner Aa coordinates: 46 ° 50 ′ 18 " N , 8 ° 11 ′ 2" E ; CH1903: 656 855 / 187749 46 ° 50 '18 " N , 8 ° 11' 2" O |
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| Mouth height | 480 m above sea level M. | |
| Height difference | 591 m | |
| Bottom slope | 75 ‰ | |
| length | 7.9 km | |
| Catchment area | 44.78 km² | |
| Discharge at the estuary A Eo : 44.78 km² |
MQ Mq |
1.79 m³ / s 40 l / (s km²) |
| Left tributaries | Latzengraben, Mettenlaui | |
| Right tributaries | Gibsgraben, Mülibach, Altibach | |
| Communities | Giswil | |
The Laui , also called Gross Laui in the upper reaches , is a nearly ten kilometer long torrent in Giswil in the canton of Obwalden in central Switzerland and the left tributary of the Sarner Aa . It should not be confused with the Lauibach in Lungern, a few kilometers away .
Headwaters
The headwaters of the Laui are located in the area of the mountain range between the crossings of Glaubbielenpass in the south and Glaubberg in the north. On the eastern slope of Nünalpstock ( 1894 m above sea level ) and Sattelstock ( 1769 m above sea level ), the source streams have created deep erosion funnels (Lätzgraben, Rohrgraben, Unterwengengraben and Gipsgraben). The creek initially flows east and overcomes a height difference of over 1000 meters on its first six kilometers.
Torrent barriers
Numerous torrent barriers tame the water of the Laui in this section. They are intended to prevent the debris from entering the Giswil valley floor . At the foot of the mountain range west of Giswil, a large, wooded alluvial fan has formed from the debris from the torrent. Here, too, the creek had to be dammed and barriers had to be built.
Valley floor
At Giswil, the Laui reaches the valley floor of the Obwalden main valley and here separates the two districts Grosteil and Kleinteil . It finally joins the Aa , the outflow of the Lungernsee and the Kleine Melchaa, to form the Dreiwässerkanal , which flows into the Sarnersee .
Floods and dams
During severe thunderstorms and prolonged rainfall in its source region, the Laui is responsible for flooding in the valley floor of Giswil. So in 1629 he swept away the old parish church and forced the Giswilers to give up an entire part of the village. This catastrophe fell in the era of the witch hunts . Someone was to blame for this flood and the destruction of the Church. The pastor recognized the culprits in his parish, and so it came to the largest witch hunt in the history of Switzerland in Giswil. Sixty-three people, in addition to the "witches" seven men and five children (four boys and one girl), were tortured, sentenced to death by the sword, executed, quartered and burned. According to tradition, the execution took place at the place where the old church stands today, which was built on the foundations of the tower of the destroyed church.
Thanks to the flood protection dams built on the Laui around the turn of the millennium, major damage was prevented during the flood situation in August 2005 . The protective dams were created from the excavation of the Giswil bypass tunnel and the Zollhaus open-cast tunnel.
Individual evidence
- ↑ a b c d e Geoserver of the Swiss Federal Administration ( information )
- ↑ Modeled mean annual discharge. In: Topographical catchment areas of Swiss waters: sub-catchment areas 2 km². Retrieved December 20, 2016 .
- ↑ Chapter “Witches' pursuit” in: Pirmin Meier : Switzerland. Mysterious landscape in the shadow of the Alps . Goldmann (Magisch Reisen), 1993, ISBN 978-3-442-12298-1 .