Analysis of Fish Migration Potential Through the Seminatural Fish Pass on an Example the Skorka Barrage on the Glomia River

Water management by artificial water level increasing in rivers, results in environmental changes. One of them is the constraint on migration of fish and other aquatic organisms. In order to facilitate the passage, fish passes are built. The study analysed many parameters related to proper work of the fish pass. The article presents results of a field study of the fish pass located within the Skorka barrage on the Glomia river. The aim of the study was to identify water flow conditions in particular chambers of the fish pass. On the basis of results of the field study, the hydraulic conditions of water flow through the fish pass were determined and referred to the optimum performance parameters of the construction. The results obtained make a basis for discussion of possible problems related to construction and operation of the fish passes resembling "close to nature" structures.