Möhlin (Rhine)

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Möhlin
The Möhlin in Breisach

The Möhlin in Breisach

Data
Water code EN : 2336
location Baden-Wuerttemberg , Germany
River system Rhine
Drain over Rhine  → North Sea
Headwaters Above Sankt Ulrich in the Black Forest from several hillside debris sources
Source height approx.  1080  m above sea level NHN
muzzle In Breisach in the Rhein , Rhein-km 225.3 coordinates: 48 ° 1 '31 "  N , 7 ° 34' 48"  O 48 ° 1 '31 "  N , 7 ° 34' 48"  O
Mouth height 189  m above sea level NHN
Height difference approx. 891 m
Bottom slope approx. 28 ‰
length 32 km
Catchment area 218.9 km²
Discharge at the Oberamhaben
A Eo gauge : 43 km²
Location: 20 km above the mouth 		NNQ
MNQ
MQ
Mq
 MHQ
 10 l / s
100 l / s
660 l / s
15.3 l / (s km²)
 8.71 m³ / s
Left tributaries New stomach
Small towns Bad Krozingen, Breisach
Communities Bollschweil, Ehrenkirchen

The Möhlin is a small, 32 km long tributary of the Rhine in the area of the Breisgau-Hochschwarzwald district . The name is possibly of Celtic origin; there is archaeological evidence of an oppidum at a tributary of the Möhlin.

course

The Möhlin rises on the western roof of the Schauinsland massif above Sankt Ulrich in the Black Forest from several slope debris sources. The main spring is located about 500 meters northeast of Gießhübel at 1080 m above sea level. NN. In the course of time, the river has cut into the anatexite and formed a steep notch valley with an average gradient of around 12 °. It flows in a north-westerly direction and after 200 meters it is passed under the county road K 4957.

The near-natural upper course flows through Bollschweil at the foot of the Black Forest and reaches the Rhine plain near Ehrenkirchen . When the Möhlin emerges from the mountains into the Rhine plain, it loses water through seepage. Depending on the runoff, infiltration accounts for up to 15% of the total volume. The course of the river is already heavily canalised in the area of ​​the city of Bad Krozingen , just above the district of Biengen, where the Neumagen , which is mostly more watery, flows into the Möhlin. With the construction of the Breisach cultural weir in 1965, the original mouth was moved below the weir.

The wing dam of the Rhine side dam crosses the Möhlin about 600 meters across the Rhine. A weir with a clear opening of 18 meters with a segment lock has been built at the crossing point in the Möhlin. In the event of a disaster, around 500 m³ / s must be discharged through the Möhlin weir. The estuary of the Möhlin below the weir therefore had to be expanded to 1.8 km in length for this discharge. In addition to discharging the disaster floods, the Möhlin weir has the task of using the movable lock above the weir to create the most favorable water levels. So that the Möhlin, which has been developed for a discharge of 500 m³ / s, does not drain the groundwater that is to be raised by the culture weir, a fixed threshold with a fish ladder was installed 400 m above the mouth of the Möhlin into the Rhine. The height of the threshold has been chosen so that an optimal water level above the threshold can be guaranteed.

Not least because of the intensive agriculture in the Rhine valley, the Möhlin falls dry on its middle course in hot summers. Conversely, the rather tranquil river can swell dangerously during heavy rainfall or sudden snowmelt.

  • Möhlinwehr

  • Möhlin with Belchen

Web links

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

Individual evidence

LUBW

Official online waterway map with a suitable section and the layers used here: Course and catchment area of ​​the Möhlin
General introduction without default settings and layers: State Institute for the Environment Baden-Württemberg (LUBW) ( notes )

  1. ↑ a b Height according to the contour line image on the background layer digital topographic map or according to the digital terrain model of the online waterway map.
  2. ↑ Length according to the waterway network layer ( AWGN ) .
  3. ↑ Catchment area after the layer aggregated areas 04 .

Other evidence

  1. ↑ Flood forecast center , State Institute for the Environment Baden-Württemberg MHQ at Abfluss-BW - a data and map service of the State Institute for the Environment Baden-Württemberg ( information )