Bied (Le Locle)
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| Data | ||
| location | Canton of Neuchâtel , Switzerland | |
| River system | Bied | |
| River basin district | Rhone | |
| source | in a valley between La Chaux-de-Fonds and Le Locle 47 ° 3 ′ 46 ″ N , 6 ° 47 ′ 6 ″ E |
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| Source height | approx. 1100 m above sea level M. | |
| Infiltration | in the southwest of Le Locle Coordinates: 47 ° 2 ′ 57 " N , 6 ° 43 ′ 28" E ; CH1903: 545 723 / 211140 47 ° 2 '57 " N , 6 ° 43' 28" O |
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| Mouth height | approx. 915 m above sea level M. | |
| Height difference | approx. 185 m | |
| Bottom slope | approx. 31 ‰ | |
| length | approx. 6 km | |
| Drain at the Le Locle gauge |
NNQ (1906) MQ HHQ (1910) |
35 l / s 250 l / s 17 m³ / s |
The Bied is a river about 6 km long on a plateau in the Jura in Le Locle in the canton of Neuchâtel in Switzerland .
geography
course
The Bied rises in a valley between La Chaux-de-Fonds and Le Locle, not far from the main European watershed . It initially flows north as a border stream between the districts of Le Locle and La Chaux-de-Fonds . After a few hundred meters it bends in a south-westerly direction and runs parallel to main road 20 to Le Locle. In the urban area he is dumped . The Bied picks up the Combe Girard underground from a valley coming from the southeast. In the southwest of Le Locle, the Bied leaves the Verdolung and flows strongly straightened to the Col des Roches . There the Bied seeps into the underground of the Jurassic Karst and passes under this obstacle in caves before it emerges again after a 2.5 km underground run on the other side as Rançonnière and flows into the Doubs .
Tributaries
- Combe Girard (left)
- Les Calame (left)
history
From the 16th to the 19th century, the cave mills of Le Locle in the caves under the Col des Roches were powered by the water power of the Bieds.
Since the infiltration funnel could not absorb large amounts of water during the snowmelt and long periods of rain, the entire valley floor was often flooded during such events until the 19th century. In 1805, the danger of flooding was largely averted with the construction of an artificial tunnel under the Col des Roches . This channel directs part of the water over an approximately 90 m high waterfall into the valley of La Rançonnière.
A flood retention basin was built on the Bied between 1968 and 1973. It was not until 1980 that the connections between sinkholes on the plateaus and the exit of the karst cave were proven by means of dye tests.