Sonnaz (river)

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Sonnaz
The Sonnaz flows into the Schiffenensee

The Sonnaz flows into the Schiffenensee

Data
Water code CH : 272
location Canton of Friborg ; Switzerland
River system Rhine
Drain over Saane  → Aare  → Rhine  → North Sea
Headwaters in the area of ​​the Seedorf plain between the cities of Freiburg and Payerne
Source height approx.  610  m above sea level M.
muzzle below Pensier (municipality of Barberêche ) in the Saane ( Schiffenensee ) Coordinates: 46 ° 50 ′ 41 ″  N , 7 ° 8 ′ 27 ″  E ; CH1903:  577 285  /  188219 46 ° 50 '41 "  N , 7 ° 8' 27"  O
Mouth height 532  m above sea level M.
Height difference approx. 78 m
Bottom slope about 6 ‰
length approx. 13 km

The Sonnaz is an approximately 13 km long left tributary of the Saane (French Sarine ) in the Swiss canton of Friborg . It drains a section of the central Freiburg Plateau and belongs to the catchment area of ​​the Rhine . The stream was first mentioned in 1317 as Sonna .

The headwaters of the Sonnaz are located in the area of ​​the Seedorf plain at 610 m above sea level. M. about halfway between the cities of Freiburg and Payerne . Several rivulets, including those that arise on the northern slope of the La Brillaz ridge , flow into the Lac de Seedorf near Noréaz . The Sonnaz leaves this lake to the east and flows through a well-developed valley, which is flanked by the Molasse hills north of Freiburg, where it soon takes a north-easterly direction and maintains this until its mouth.

Especially in the lowest section in the area of ​​today's municipality of La Sonnaz (the stream gave its name to the municipality that was created on January 1, 2004 through the merger of Lossy-Formangueires , La Corbaz and Cormagens ), the Sonnaz flows through a wide valley basin. Until 1963 , it flowed below Pensier (municipality of Barberêche ) into the Saane, which is now dammed up to become Schiffenensee (532 m above sea level). The gradient of the Sonnaz is usually less than 1%.

Sections of the middle and lower reaches of the Sonnaz are still in their natural or near-natural state. In the agricultural areas of the Lake Village Plain and near Belfaux , the water was straightened and the embankments paved. The Sonnaz is characterized by a pluvial runoff regime . In the past, their hydropower was used to power mills in various places.

Web links

Commons : Sonnaz  - collection of images, videos and audio files