Boiron de Morges
| Boiron de Morges | ||
 The Boiron de Morges between Tolochenaz and Saint-Prex |
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| Data | ||
| location | Canton of Vaud , Switzerland | |
| River system | Rhone | |
| Drain over | Rhone → Mediterranean | |
| source | south of Ballens 46 ° 32 ′ 46 ″ N , 6 ° 23 ′ 0 ″ E |
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| Source height | approx. 685 m above sea level M. | |
| muzzle | in Lake Geneva coordinates: 46 ° 29 ′ 28 " N , 6 ° 28 ′ 47" E ; CH1903: 526 384 / 149 326 46 ° 29 '28 " N , 6 ° 28' 47" O |
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| Mouth height | 373 m above sea level M. | |
| Height difference | approx. 312 m | |
| Bottom slope | approx. 21 ‰ | |
| length | approx. 15 km | |
The Boiron de Morges is an approximately 15 km long tributary of Lake Geneva in the canton of Vaud in Switzerland . It drains a section of the western edge zone of the Waadtländer Mittelland and belongs to the catchment area of the Rhone . 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 Morges are located at around 685 m above sea level. M. in the forest depression of Le Paudex on the Jura foot plateau southeast of the municipality of Ballens . The stream initially flows eastwards until it reaches the 300 m wide, flat valley floor of the Grand Marais near the hamlet of Froideville . This valley, which is now only used by rivulets, served the Ice Age Rhone Glacier as a meltwater channel for a long time.
From Froideville to the south, the Boiron de Morges uses this valley system, which is flanked by the vast forests of Les Tailles and Les Bougeries . It has a very small gradient of around 0.2%. After about 3 km, the stream leaves this former meltwater channel and turns to the southeast. With a wide hollow it crosses the edge of the Jura foot plateau and enters the Lake Geneva basin.
The lower course of the Boiron de Morges is characterized by numerous meanders in an erosion valley that is slightly sunk into the surroundings . At its confluence with Lake Geneva between the towns of Saint-Prex and Morges , the Boiron de Morges has raised a small alluvial cone . The Boiron de Morges has a pluvial discharge regime . The only noteworthy side stream is the Irence , which flows below the village of Villars-sous-Yens .
The Boiron de Morges flows through areas that are used intensively for agriculture and is therefore largely regulated and squeezed into a narrow stream bed. Sections of the lower reaches that do not border directly on the agricultural area are still in a near-natural, partially natural condition. Since the Middle Ages , the water power of the Boiron de Morges has been used in various places to operate mills.
As part of the monitoring of the water quality of Lake Geneva by the Commission internationale pour la protection des eaux du Léman (CIPEL), the scientific investigation of the water quality, flora and fauna of the Boiron de Morges also figures.