Fish ladder, Fish passage, Fish ladder, Fishway, Fish step
Filter Units can be used for building a fish ladder enabling fish to pass and at the same time limit the flood risk by reducing a river bank erosion. Filter Units got a porous structure and offer the possibility for an individual positioning. Stones kept in the net cannot be washed away even in case of a high velocity.
As a recognized fast production product (about 6 minutes to produce a 2t net) with a single point lifting ring, the Rockbags offer a very attractive and easy solution. Filter Units can be filled at site or outside the worksite, be stacked, stored and transported.
A Filter Unit Rockbag is produced by placing the net into the production frame and filling it with stone or rocks. The recommended granulometry of the filling material is 50-200 mm. The diameter of a 2t net is 1.9m and a height of 40 cm. By reducing the amount of filling material the height is adjustable. Filter Units are highly maneuverable due to the single point lifting system which allows for a quick, easy and safe installation or removal. Even after removal, Filter Units can be reutilized in a different application.