The subject of the project is activities located in the water flow of the Wierzyca river. These are tasks aimed at the proper management of rainwaters and meltwaters, which pose a flood risk to the area of Kościerzyna. Within the framework of the project, 4 stages will be implemented: I-Osiedle West: construction of the rain canal system with a length of 5.95 km with the construction of 2 retention tanks with capacity 2201 m³, II-Osiedle Tysiąclet II: construction of the rain canal system with a length of 3.45 km with construction of 2 reservoirs with capacity 3945 m³, III-Osiedle Za Torami. Capacity of small retention facilities-17766 m³ The length of the rain canal-15.37 km Number of population benefiting from flood protection measures-21 480os.