Acta Scientiarum Polonorum

Fish migrate alongside the river in search of food, suitable hiding places and spawning grounds during the various seasons and periods of their lives. Damming a river with a weir or other artificial dam disrupts these normal life processes or even makes them impossible. The main way to overcome this problem is to build fish passes. Passes are facilities that allow fish and other aquatic organisms to migrate up and down the river through barriers such as thresholds, dams and weirs. Conventional solutions of fish pass construction have the most significant number of studies both in the literature as well as in engineering practice. Therefore, their design methodology is widely available. It considers, first of all, hydraulic and granulometric parameters, conditions of particular structure elements locations, but also properties of migrating fish species. This study covers the concept of restoration of a dam on the Radomka river with a conventional pool fish pass. The pool fish pass will be located along the river bank, allowing the migration of fish identified in the study area. Additionally, it was developed a concept of bed material mixture, consisting of clastic material in the form of sand with addition of a coarser gravel-stone fraction.