In the process it was decided to build 45 vertical slot basins in order to overcome the 5.20m difference in height. Resulting, the 15m long powerhouse had to be crossed by a horizontal passage. Due to the existing situation of limited space and the need to integrate numerous infrastructure routes, the upstream fish migration (FAA) was designed under the Enz bicycle path and was intergrated completely and unobtrusively flood-proof under the terrain.
The fish ladder provides the first and crucial element in accessing the Enz upstream Pforzheim. The location Auerbruecke provides access and permeability for the water inhabitants upstream the Enz.The action was taken by the municipal utilities in accordance with the regional council Karlsruhe.