Red (Murg)

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red
Rot near Walliswil (Murgenthal municipality, Aargau)

Rot near Walliswil (Murgenthal municipality, Aargau)

Data
Water code CH : 519
location Mittelland

Switzerland

River system Rhine
Drain over Murg  → Aare  → Rhine  → North Sea
source in the east of the municipality of Gondiswil
47 ° 8 ′ 8 ″  N , 7 ° 53 ′ 21 ″  E
Source height 710  m above sea level M.
confluence with the Langete to Murg Coordinates: 47 ° 15 ′ 5 ″  N , 7 ° 49 ′ 35 ″  E ; CH1903:  629 363  /  233443 47 ° 15 '5 "  N , 7 ° 49' 35"  O
Mouth height 420  m above sea level M.
Height difference 290 m
Bottom slope 17 ‰
length 17 km
Catchment area 46.1 km²
Discharge
A Eo : 46.1 km²
at the mouth
MQ
Mq
790 l / s
17.1 l / (s km²)
Left tributaries Melchnauer Dorfbach
Right tributaries Fischbach, Stempech, Groppebach
Communities Grossdietwil , Altbüron , St. Urban , Roggwil
Residents in the catchment area 5524 (1990)

The Rot (formerly also Roth ) is a 17 km long stream in the border area of ​​the three cantons of Bern, Lucerne and Aargau. It is the right and south-southeastern headwaters of the Murg .

geography

course

The Rot rises east of the municipality of Gondiswil , flows past Grossdietwil and Altbüron to St. Urban and joins the Langete at Roggwil ; from there to the confluence with the Aare the water is called Murg .

Almost its entire length of 17 km forms the border between the canton of Bern and the cantons of Lucerne and Aargau .

Hydrology

The runoff of the Rot at the Roggwil measuring station is a long-term mean of 0.89 m³ / s. The mean monthly discharge fluctuates between 0.6 m³ / s in August and 1.16 m³ / s in March. Over 40 m³ / s were measured during floods.

The brook muddles strongly and together with the water ditches (side canals) forms a strongly branched water network.

The catchment area has an area of ​​46.1 km²; 66% of it is used for agriculture; 27% are covered by forest and wood, 7% are built over.

nature and environment

Wastewater treatment

The municipalities in the catchment area of ​​the Rot are connected to the WWTP Murg bei Wynau by a collecting canal , which uses the Aare as a strong receiving water. The wastewater treatment plant is supported by a special purpose association made up of 12 municipalities and has been in operation since 1979.

Water mats

Meadow irrigation in the Rottal

The valley landscape of the Rot is characterized by the water mats, which give it a permanently green and richly structured appearance. The cultivated landscape created by meadow irrigation was registered in 1983 as object no. In 1312 included in the federal inventory of landscapes and natural monuments of national importance .

The protection and preservation of the Wässermatten tradition in the Rottal are regulated in a similar way to the Langete : the managers have asked the Wässermatten Foundation (in which the Canton of Lucerne has also been involved since 1994) to cultivate grass with irrigation as well as to renew and maintain it Water systems obligated; In return, the foundation will compensate them for additional work and reduced income.

biology

Long stretches of the red are lined with wood on the banks. Together with the water mats, it forms a natural habitat that is characterized by a high level of biodiversity . A total of 21 species of locusts have been recorded in the Rottal; including the endangered marsh insect .

The fish stock in the Rot consists mainly of brown trout ; But bullheads and rarer species such as the brook lamprey also occur. The once widespread otter has disappeared from the Rottal, beavers are returning. Also clawed crayfish , grass and water frogs return gradually; their catch was still practiced commercially in the 19th century.

The “Lebendiges Rottal” association is reviving the tradition of carp farming in the Rottal , which was founded by the Cistercians of the St. Urban monastery . On his initiative, the “Äschweiher”, a carp pond near Ludligen an der Rot , was created in 2004. In addition to the pond, several small bodies of water were created for amphibians.

Web links

Commons : Red  - Collection of images, videos, and audio files

Individual evidence

  1. a b c Geoserver of the Swiss Federal Administration ( information )
  2. a b c Topographical catchment areas of Swiss waters: area outlets. Retrieved May 26, 2019 .
  3. V. Binggeli / M. Ischi: The Wässermatten-Schutzgebiet von Altbüron. In: Jahrbuch des Oberaargaus No. 38, 1995, pp. 123–146.
  4. P. Barrier: Ecological studies on grasshoppers of the Rottal. In: Jahrbuch des Oberaargaus No. 38, 1995, pp. 93–122.