Old Aller

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Alte Aller (upper section)
The "Alte Aller" near Verden

The "Alte Aller" near Verden

Data
location Lower Saxony , Germany
River system Weser
Drain over Aller  → Weser  → North Sea
source Verden
52 ° 54 ′ 41 ″  N , 9 ° 13 ′ 46 ″  E
Source height approx.  10  m above sea level NN
muzzle Verden in the Aller coordinates: 52 ° 55 ′ 42 "  N , 9 ° 12 ′ 58"  E 52 ° 55 ′ 42 "  N , 9 ° 12 ′ 58"  E
Mouth height approx.  9.5  m above sea level NN
Height difference approx. 0.5 m
Bottom slope approx. 0.2 ‰
length 2.5 km
Medium-sized cities Verden
Alte Aller (lower section)
Alte Aller just before it flows into the Weser near Baden

Alte Aller just before it flows into the Weser near Baden

Data
location Lower Saxony , Germany
River system Weser
Drain over Weser  → North Sea
source Langwedel (Weser)
52 ° 59 ′ 44 ″  N , 9 ° 11 ′ 3 ″  E
Source height 7  m above sea level NN
muzzle Baden (Achim) in the Weser
52 ° 59 ′ 44 ″  N , 9 ° 4 ′ 49 ″  E
Mouth height 5  m above sea level NN
Height difference 2 m
Bottom slope 0.27 ‰
length 7.5 km
Small towns Langwedel (Weser)
Communities Daverden , Etelsen , Baden (Achim)

Sections not yet completely silted up ( oxbow lakes ) of the Aller in the Verden river section to Baden in Lower Saxony are referred to as Alte Aller .

Origin and course

The river bed of the Aller, like the neighboring river valleys, was created at the end of the last Ice Age , when the melt waters of the glaciers retreating to Scandinavia were looking for a way towards the sea. Through natural processes, the Aller looked for and developed new branches on the lower reaches of the river. The so-called oxbow lakes could silt up or become part of the main river again at a later date.

The topography of the Alte Aller today consists of several sections, the main ones being:

  • The (upper) Alte Aller lies to the left of the main stream, is about 2.5 km long and, together with the main arm of the Aller, forms an elongated, narrow island that lies west of the old town of Verden. The conspicuously straight course of the Aller in this section indicates that a new river bed may have been created here when the bridge was built. The river, which could be experienced 100 years ago, has already silted up to a length of 50 m at the point of entry. The lower part of this oxbow lake is about half as wide as the main stream.

Other bodies of water named Alte Aller are located to the right of the Aller estuary and the subsequent course of the Weser and are remnants of the Aller courses from a time when the Aller flowed into the Weser significantly further downstream than it is today:

  • Half a kilometer above today's estuary and southeast of Klein Eissel there is a lake called Alte Aller , which can be recognized in its curved shape as an old river bend. The lakes following downstream are called Lange Kuhle and - at a much greater distance from today's river - the Eisseler See on the eastern edge of Groß Eissel .
  • The approximately 7.5 km long creek called Alte Aller begins in the east of Langwedel near the point where Langwedel Castle stood in the Middle Ages . At Daverden it absorbs the water from a system of rifts into which the Eisseler See also drains. It continues in a westerly direction past the village of Etelsen to Achim , where it flows into the Weser in the Baden district near the Badener Berg . When the Langwedel lock canal was built from 1937 onwards, parts of the Alten Aller that crossed it were filled in and a new bed was created for the Alte Aller between Etelsen and Baden, in which lakes are also integrated near Etelsen that suggest earlier river loops. This Alte Aller near Baden flows into the Weser via a weir .

meaning

The Alte Allern are partly standing, partly slowly flowing bodies of water with a lot of vegetation on the edge and in the water. The basic structure is sandy-boggy with slightly cloudy water. The Alte Allern is used by hikers, nature lovers and anglers. The main fish species today are eel, pike, perch, carp, tench, white fish and crayfish. In the period from May to October, paddling is permitted on the Alte Aller to a limited extent, taking into account nature compatibility. Only paddle boats (kayaks, canoes and canoes) are allowed.

Other known oxbow lakes

Between Otersen (south-east of Verden) and the current course of the Aller, the seven Oterser Lakes also emerged from an old course of the Aller. This oxbow lake was probably created after a flood around 1774 and was divided into seven lakes with earth walls so that the farmers could more easily drive their cattle to the pastures on the other side of the bank. World icon

Individual evidence

  1. ↑ Heinz Kuhlmann: The Weser and the Baden property on the opposite bank of the Weser . In: Geschichtswerkstatt Achim - Association for Regional History eV (Hrsg.): 1000 years of Baden . House of Advertising Verden, Verden 2013, ISBN 978-3-00-039036-4 , p. 277-296 .

Historical maps