Alpe (Aller)

BW

The Alpe is a 30 km long, left or southern tributary of the Aller in Lower Saxony (Germany ). Its catchment area is located at the mouth of the Weser and Aller angle.

Course

The headwaters of the Alpe is located in a flat wave Geest area south of Aller glacial valley in the area of the town of Neustadt am Ruebenberge, also called Mill Fields Country. The Alpe itself originates from the western edge of the moor sink Dudenser. The there after one kilometer from the left opens out digging comes from a only in parts water-bearing valley, which is at least a good three kilometers longer than that of the Alpe. Its narrow catchment area starts at the highest elevation of the Alpe- catchment area, the 101 -meter high mountain hut in the forest Grinder. The letter addressed to the northeast broad valley of the Alpe then narrows slightly and is sunk between Bevensen and loaders wood about 20 meters deep into the surrounding Grundmoränenplateau.

After emerging in the Talsandebene of Aller- glacial valley, the Alpe takes up the north-western direction of flow which opens from right Lutterer creek and follows a valley line parallel to the southern edge of the glacial valley that has emerged in the last glacial period as one of several previous courses of the east adjacent line. Then the Alpe turns northward and is accompanied at 10 kilometers to the east from the village street Rodewald. To the west is adjacent to the large-area light moor.

In Lichtenhorst it pivots approximately one to the north-west direction of the opening out of new right -hasty trench and thus follows a Saalian glacial history of all. In her last, again north-trending section running the Alpe forms the boundary between the lowlands of Rethem bog in the west and the Talsandebene the pods Heath in the East.

On the southern outskirts of Rethem (Aller) the Alpe on the white trench is headed west to the smaller Wölpe which has thus become the largest tributary of the Alpe. This Alpe- Wölpe - Umfluter called watercourse is primarily for flood protection of Rethem. Before forwarding the Alpe flowed through the old town and Rethemer led there in the Aller. Today the estuary is 1.5 kilometers to the northwest in Wohldorf district. By this measure, the catchment area of ​​Alpe increased by nearly 200 km ² to 257 km ², and the average discharge of more than 1.3 m³ / s to more than 1.8 m³ / s

Ecological aspects

In the 1970s, the Alpe was straightened, largely also channeled. The river has throughout the course of a good water quality ( grade II = moderately polluted ). The opening out of left Steimbker village ditch is heavily polluted ( grade III -IV) ..