Kleine Aller

The Kleine Aller is a tributary of the Aller and Aller Canal in the German state of Lower Saxony. It is about 15 kilometres (9.3 mi) long and up to 5 metres (16 ft) wide, and flows from north to south through the district of Gifhorn and the city of Wolfsburg.

The Kleine Aller rises in the Brome village of Wiswedel at 78 m above sea level. It drains the Kiebitzmoor west of Tülau, through a system of ditches that has been continually expanded over the years, and also drains the Vogelmoor north of Barwedel. In this region it is joined by the tributary of the Rhodische Aller. Finally the Kleine Aller flows southwards, past Bergfeld, Barwedel, Tiddische, Hoitlingen and Jembke. From Jembke it forms the border between the district of Gifhorn and the city of Wolfsburg. The river also passes Wolfsburg-Brackstedt and Wolfsburg-Warmenau to enter the Aller Canal south of Weyhausen at a height of 55.5 m above sea level and at a point a few hundred metres after it branches away from the River Aller itself.

The sections near Tülau, Bergefeld and Tiddische have been renaturalised and, in places, a new river channel has been dug out. The near-natural areas thus created have been planted with alder. This provides important areas of shade because much of the river is directly illuminated by the sun, something which leads to rapid weed growth and choking of the river bed.

The river channel was formed, like the surrounding landscape, in the penultimate ice age, the Saale glaciation. The ice sheets shaped the terrain over 100,000 years ago with their ground moraines. The streams acted as drainage channels for the higher lying areas of geest in the Aller glacial valley.

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