Author(s): Eliza Uzunova; L. Kanev; Sivliya Petkova; Ina Dimitrova; Dimitar Kisliakov
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Abstract: Proper selection of place and type of river rehabilitation measure is of particular importance for rivers with numerous low barriers, such as weirs. An experimental convertor for water energy utilization along with a fish pass was constructed at a weir situated in upper reaches of the Iskar River, a tributary of the Danube River, Bulgaria. Based on the fish diversity and abundance in the observed upstream and downstream area, it could be concluded that the operation of the fish pass over several years achieved longitudinal river connectivity to some extent. Investigation of the hydraulic features of the fish pass showed the necessity of adapting certain structures to seasonal hydraulic changes as well as to the swimming characteristics of the local fish community composed mainly of small bottom-dwelling species.
Year: 2018