Channeling and revitalization of the Mülibach
The insufficient capacity of a culvert in the agricultural area above Altnau resulted in the Mülibach stream flooding the settlement area — many times over the years. In 1999, this caused a serious flood event. HOLINGER AG drew up and implemented a natural hazard action plan and based on it, a flood protection and revitalization project.
In the Laubacker section, a 240 m length of the Mülibach was opened up. This is also known as deculverting or daylighting. The stream was then flood-proofed and revitalized. The aquatic ecology of the Mülibach was significantly improved thanks to the daylighting and the creation of a continuous low water channel with a structured bed, groups of blocks and root stocks. In particular, the longitudinal connectivity was restored: i.e. acquatic life is now free to move up or down the stream.