Lyssbach
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Lyssbach Lyssach |
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 Stone bridge in Lyss |
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| Data | ||
| Water code | CH : 1402 | |
| location |
Mittelland
|
|
| River system | Rhine | |
| Drain over | Alte Aare → Aare → Rhine → North Sea | |
| source | at Moosaffoltern in the municipality of Rapperswil 47 ° 2 ′ 33 ″ N , 7 ° 26 ′ 15 ″ E |
|
| Source height | approx. 574 m above sea level M. | |
| muzzle | at Lyss in the Alte Aare Coordinates: 47 ° 5 '45 " N , 7 ° 18' 38" E ; CH1903: 590 280 / 216086 47 ° 5 '45 " N , 7 ° 18' 38" O |
|
| Mouth height | 435 m above sea level M. | |
| Height difference | approx. 139 m | |
| Bottom slope | approx. 8.7 ‰ | |
| length | 15.9 km | |
| Catchment area | 56.44 km² | |
| Discharge at the estuary A Eo : 56.44 km² |
MQ Mq |
1.41 m³ / s 25 l / (s km²) |
| Left tributaries | Chüelibach , Alewilbach , Seebach | |
| Right tributaries | Schlattbach | |
| Small towns | Lyss | |
| Communities | Rapperswil , Schüpfen , Grossaffoltern , Lyss | |
The Lyssbach is an approximately 16-kilometer-long right tributary of the Alte Aare in the Swiss canton of Bern , which drains a section of the Bernese Mittelland .
geography
course
The source of the Lyssbach lies on the Rapperswiler plateau at about 574 m above sea level. M. on the southern outskirts of Moosaffoltern in the municipality of Rapperswil . At the beginning, the stream mostly flows in a convoluted direction to the southwest towards Lyssbachtal . At the hamlet of Lätti , it rises for around 160 meters to the surface for the first time before reaching the bottom of the valley . At the Schönbrunnen farm he just passes the Urtenen spring and turns to the northwest.
Shortly afterwards, at the confluence of the Hintelgraben , it comes to the surface again and now flows through an approximately 800-meter-wide valley , where it is mostly accompanied by a more or less thick forest edge. It runs along the northern floor of the valley and initially forms the border between Rapperswil and Schüpfen for around 2 km . A little north of Schwanden it crosses over completely to Schüpfer Boden and first passes the village on its northern settlement boundary before separating a quarter from the village center and taking up the approximately eight kilometers long Chüelibach . The valley is now getting narrower and reaches around 100 meters at its widest point.
It runs north of the hamlet Bundkofen and cross the municipal border with Grossaffoltern , where he simultaneously at Kosthofen the Alewilbach will flow from the left. About 500 meters downstream, a small canal branches off on its left bank, which meets the Lyssbach again at Suberg . The stream reaches Lyss , where shortly afterwards it takes up the Seebach and now flows through the industrial area of the small town. At the Seelandhalle he enters the Aare valley and crosses the settlement area. At the northern boundary of the settlement it again reaches an industrial area and a gravel pit on the right bank. Here it runs parallel to the Alte Aare, into which it only a little later at the ARA southwest of Busswil at 435 m above sea level. M. opens.
Catchment area
The catchment area of the Lyssbach measures 56.44 square kilometers, consisting of 55.9% agricultural area, 30.8% wooded area, 12.9% built-up area, 0.3% water and 0.1% unproductive area. The highest point is 820 m above sea level. M. in the Seiebergwald near Wahlendorf , the average altitude is 571 m above sea level. M.
Flood relief tunnel
The brook has repeatedly overflowed its banks in recent decades, which has led to severe flooding, especially in Lyss . In the summer of 2012, a flood relief tunnel was completed, which in Leen drains part of the water directly to the Alte Aare during heavy rainfall.
Web links
Individual evidence
- ↑ a b Geoserver of the Swiss Federal Administration ( information )
- ↑ Water network in the WebGis geographic information system of the canton of Bern
- ↑ a b c Modeled mean annual discharge. In: Topographical catchment areas of Swiss waters: sub-catchment areas 2 km². Retrieved August 12, 2017 .
- ↑ Employees: 2007 Lyssbach in Lyss. (No longer available online.) In: wvsag.ch. Wasserverbund Seeland AG, archived from the original on August 12, 2017 ; retrieved on August 12, 2017 : “The Lyssbach in Lyss has overflowed its banks several times in recent years ... Lyss was flooded three times in 2007 alone (June 21/08 / August 29). The resulting material damage amounts to around 100 million Swiss francs. ” 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.
- ^ Herbert Rentsch: Lyss - The Lyssbach first flowed through the tunnel. In: bernerzeitung.ch . Tamedia , October 10, 2012, accessed November 2, 2015 .
- ↑ Simone Lippuner: Lyss - Mayor Hegg pays homage to the tunnel. In: bernerzeitung.ch . Tamedia , June 28, 2016, accessed August 12, 2017 .
