Great Aue (Weser)

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Große Aue in
sections also Aue , Neuer Mühlenbach and Mühlenbach
At Steyerberg the Große Aue reaches the Weser lowlands.

At Steyerberg the Große Aue reaches the Weser lowlands .

Data
Water code EN : 476
location North Rhine-Westphalia and Lower Saxony , ( Germany )
River system Weser
Drain over Weser  → North Sea
source Northeast of Bieren , west of Dono
52 ° 14 ′ 35 ″  N , 8 ° 32 ′ 41 ″  E
Source height 118  m above sea level NHN
muzzle for inland in the Weser coordinates: 52 ° 37 '22 "  N , 9 ° 9' 49"  E 52 ° 37 '22 "  N , 9 ° 9' 49"  E
Mouth height 22  m above sea level NHN
Height difference 96 m
Bottom slope 1.1 ‰
length 88 km
Catchment area 1,522.31 km²
Discharge at the Heide OP
A Eo gauge : 1014 km²
Location: 22.7 km above the mouth 		NNQ (15.09.1991)
MNQ 1965/2014
MQ 1965/2014
Mq 1965/2014
 MHQ 1965/2014
HHQ (13.03.1981) 		39 l / s
733 l / s
7.02 m³ / s
6.9 l / (s km²)
 53.6 m³ / s
106 m³ / s
Discharge at the Steyerberg
A Eo gauge : 1446 km²
Location: 8 km above the mouth 		NNQ
MNQ 1987/2002
MQ 1987/2002
Mq 1987/2002
 MHQ 1987/2002
HHQ 		1.1 m³ / s
2.26 m³ / s
11.5 m³ / s
8 l / (s km²)
 82.1 m³ / s
138 m³ / s
Left tributaries Nordbach , Schierenbeke , Großer Dieckfluss , Ströher Graben, Bleckriede, Flute, Kleine Aue , Sule , Allerbeeke , Siede , Peekriede, Winterbach
Right tributaries Klosterbach , Flöthe , Kleine Aue , Wickriede , Langer Graben, Herrenriede, Rüsselbach, Sarninghäuser Meerbach, Langhorst Kuhlengraben
Medium-sized cities Lübbecke , Espelkamp
Small towns Prussian Oldendorf , Rahden
Communities Rödinghausen , Wagenfeld , Varrel , Barenburg , Kirchdorf , Steyerberg , Binnen , Liebenau

The Große Aue (first Aue and then Neuer Mühlenbach or Mühlenbach in the upper reaches ) is 88 km long, southwest and after the Hunte and the Diemel the third largest left tributary of the Weser . Its catchment area is in northern North Rhine-Westphalia and central Lower Saxony .

course

The Große Aue rises at a source height of 118  m above sea level. NN as floodplain on the south side of the Wiehengebirge in the Dono district of the Rödinghausen community in North Rhine-Westphalia . After one kilometer it turns north and is called Große Aue from the confluence of the north stream coming from the west ( Schwenningdorf ) . It crosses the Wiehen Mountains in a breakthrough valley . It loses 40 meters in altitude and drives two mills, so that it is called Neuer Mühlenbach in the cut through the Wiehen main ridge , after the Schwenningdorfer Neue Mühle . Further down near Fiegenburg, it even takes over the name Mühlenbach from a western tributary that drains the entire Eggetal and as such drives the mill of Gut Crollage , east of the Egge upstream of the Wiehen main ridge .

Upper course of the Great Aue between the towns of Lübbecke and Preußisch Oldendorf

The name "Mühlenbach" ends in Bad Holzhausen . There the Große Aue reaches the North German Plain . At river km  74.2 it crosses under the Mittelland Canal . On the western edge of Espelkamp (river kilometers 69-67.4) two lakes were created in the floodplain beyond the dike, the Great Auesee and the lake on Kleihügel . Between kilometers 66.3 and 61.2, the Große Aue flows for the first time in two parallel rivers, one of which is straightened, the other the first section of a renatured river course. After passing Rahden to the west, it takes up the Great Dieck River near Preussisch Ströhen and reaches Lower Saxony. Between Wagenfeld - Ströhen and Barenburg , it reaches the Diepholzer Moorniederung flowing north and then follows it eastwards through the southern Sulinger Bruch. The left bank of the strikingly rising geest heights of the Eickhofer Heide flows around the Große Aue, sweeping a little to the south and reaches the Weser lowlands at Steyerberg , whose western edge it marks from now on. Five kilometers below Liebenau , halfway to Nienburg , it flows into the Weser at Binnen . There, after 88 kilometers of running, the Große Aue has grown to an average discharge of over 11.5 m³ / s.

Renaturation

In the years after the Second World War , everything was done to turn the Great Aue into a canal-like river and thus achieve a flood-free river. In the 1980s, initiatives in the Minden-Lübbecke area led to the decision to renature the river landscape. The landscape, which had become species-poor as a result of the expansion, was supposed to recover. Riparian forests, hedges and the typical plants and animals should be given a habitat again.

When the groundbreaking ceremony for renaturation took place in 1989 , this project was unique in North Rhine-Westphalia. The monotonous river bed and its up to 300 m wide side rooms were redesigned into a natural meadow landscape . Around 200 hectares of floodplain were reclaimed. The technically developed barrel was largely preserved. At the same time, a new body of water was created that flows into the old course at several points. From today's perspective, a species-rich fauna and flora was created without flood disasters being expected.

Flora and fauna

In the Rahden area, the renatured river and the bank area form the FFH area "Große Aue" (FFH area number 3517-302) over a length of approx. 12 km and a width of 500 m . Target species are primarily fish species such as the wolffish , the bitterling and the mud whip, but also dragonflies such as the great moss damsel .

A valuable habitat for typical meadow plants and animals has been created on the Große Aue. Swan flowers , water feathers and bladder sedge as well as sword insects and marsh insects can be found in the wetlands and in the still and flowing waters . Endangered dragonflies ( banded darter , southern rush damsel ) live there as well as black warblers and little grebes . Reed bunting , reed warbler and common snipe also appear.

The near-natural grassland and wet meadows in the upper reaches of Rödinghausen are protected under the name Auebachtal . Above all, the flowery moist and wet grasslands with their interspersed sedge beds and reed beds are valuable .

Tributaries

L = left-hand side, R = right-hand side tributaries viewed downstream

See also

Web links

Commons : Große Aue  - collection of pictures, videos and audio files
Wiktionary: Große Aue  - explanations of meanings, word origins, synonyms, translations

Individual evidence

  1. ↑ a b German basic map 1: 5000
  2. ↑ Topographical Information Management, Cologne District Government, Department GEObasis NRW ( Notes )
  3. ↑ Water directory of the State Office for Nature, Environment and Consumer Protection NRW - PDF, 1 MB
  4. ^ Deutsches Gewässerkundliches Jahrbuch Weser-Ems 2014. Lower Saxony State Agency for Water Management, Coastal and Nature Conservation, p. 168, accessed on October 4, 2017 (PDF, German, 8805 kB).
  5. ↑ Main aquatic values ​​and discharge from gauges in the catchment area of ​​the Große Aue Table 2 of the inventory for the implementation of the EU Water Framework Directive (processing area Große Aue); District Government Hanover; November 2004; On: wasserblick.net (PDF, German, 70 kB)
  6. ↑ Natura 2000 areas in North Rhine-Westphalia , accessed on January 31, 2016