The Burgdorfer Aue is formed by the confluence of several drainage ditches north of Hohenhameln. It takes its name from Equord in the district of Peine. North of Mehrum, it passes through a culvert under the Mittelland Canal and then runs in a northwesterly direction, between the Hämeler Wald in the east and the town of Lehrte in the west. Here the Lehrter Bach flows from the left. The river Steinwedel passes in northern direction and crosses the town of Burgdorf in two arms. North of Obershagen, the Burgdorfer Aue branches today in the further northeast flowing Alte Aue (right, GKZ: 48542) and directed to the north Neue Aue (left, GKZ: 48544). Both lead into the Fuhsekanal (GKZ: 4854).
The new floodplain will carry the main amount of water at low to medium water levels, but the branching is designed to have an upper limit on its flow. At high tide, most of it flows through the Alte Aue. This takes after 1.8 km from the right Thöse on and is called from here only Aue. At the (earlier) mouth of the floodplain from the left into the Fuhse in the north of Nienhagen, the Fuhsekanal now branches off to the left from it. Because of a built-in threshold (there was even a weir here for a long time), no water from the river reaches the canal today at low tide. The water of the floodplain, however, he usually takes up completely. Three and a half kilometers downstream at Westercelle, the canal takes on the Neue Aue.
Environmental and nature conservation The water of the Burgdorfer Aue consistently has the quality class II-III: "critically loaded". [5] [6]
In March 2016, the hunting community Burgdorf reported the return of the beaver in the Burgdorfer Aue, which is considered an indication of good water quality.
According to a decree of the former municipal association Greater Hannover (now Hannover Region) of 1969, large parts of the Burgdorfer Aue between Lehrte and Burgdorf with a size of 751.7 ha have been declared a protected landscape area.