Why do beavers build daemes

info fauna
Swiss Center for Fauna Cartography (SZKF / CSCF)

If a body of water is too shallow, beavers usually build a dam. There are various reasons for this: They solve various problems at once:

  • so that the entrances to the buildings are always under water, the beavers need a water depth of about half a meter,
  • regularly changing water levels are compensated so that
  • the habitat is expanded by the larger water surface,
  • Wood can be transported across the water without any problems.


Start of construction of a beaver dam. First, large trunks are laid in the water parallel to the direction of flow and anchored in the embankment. Then finer branches, stones and mud are built up to form a dam.


Beaver dam on a small stream.


Beaver dam on a small stream.

Beaver dam on a small stream. A sizeable pond has formed behind the dam. The dam is flowed around on the left.

Beaver dam (on the right at the edge of the picture behind the willows) in a retention basin). On the left in the picture there is a strong flow around the dam.

 
Beaver dam in a drainage canal in the agricultural area. The dam is built entirely from corn stalks.

Around 25 m wide and 1 m high beaver dam on a small stream in the Eifel (Germany).

Section through an abandoned beaver dam that has broken. The wooden construction (left) and the sealing with mud (right) are nice to see. The direction of flow of the water is from right to left.


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