Boiron de Nyon
| Boiron de Nyon | ||
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| Data | ||
| Water code | CH : 107 | |
| location | Canton of Vaud , Switzerland | |
| River system | Rhone | |
| Drain over | Rhone → Mediterranean | |
| source | at La Rippe 46 ° 23 ′ 29 ″ N , 6 ° 9 ′ 24 ″ E |
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| Source height | approx. 525 m above sea level M. | |
| muzzle | near Nyon in Lake Geneva Coordinates: 46 ° 22 '25 " N , 6 ° 14' 4" E ; CH1903: 507 349 / 136510 46 ° 22 '25 " N , 6 ° 14' 4" O |
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| Mouth height | 372 m above sea level M. | |
| Height difference | approx. 153 m | |
| Bottom slope | approx. 13 ‰ | |
| length | approx. 12 km | |
The Boiron de Nyon is an approximately 12 km long tributary of Lake Geneva in the canton of Vaud in Switzerland . It drains a section of the plateau between Lake Geneva and the Vaud Jura and belongs to the catchment area of the Rhone . The stream is first mentioned in a document under the name Boiro around the year 1200 . The name goes back to the old French word boire , which roughly corresponds to the meaning of "Bachgraben", "Wassergraben".
The headwaters of the Boiron de Nyon are located at around 525 m above sea level. M. at the Le Vivier pond at the southeastern foot of the Dôle in the municipality of La Rippe . The Combe de la Joie and Combe de la Mey valleys on the slope of the Dôle are tributary to the Boiron de Nyon catchment area . The stream initially flows south as a small trickle and reaches the border between France and Switzerland between La Rippe and Crassier . It forms the border over a length of around 1 km, after which it turns to the east.
After the Boiron de Nyon has so far mostly moved in a wide lowland, it gradually sinks into the plain at the foot of the Jura, which slopes towards Lake Geneva, and forms a narrow erosion valley (up to 30 m into the surrounding area) over long stretches of forest incised). It flows into Lake Geneva southwest of Nyon . The Boiron de Nyon has a nivopluvial discharge regime .
In Roman times , the water from the Boiron de Nyon, together with that from the Versoix, served to supply the city of Colonia Iulia Equestris (Nyon). Since the Middle Ages the water power of the stream has been used to operate mills.
