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Faculty of Civil Engineering and Architecture , University of Nis , Niš , Serbia
Faculty of Civil Engineering and Architecture, University of Nis , Niš , Serbia
Nature-like fish passes are complex hydraulic–ecological systems whose performance is often assessed through fragmented monitoring approaches. This paper proposes an integrated KPI-based framework for the evaluation and classification of fish pass functionality, combining biological, hydraulic, and operational indicators within a structured methodology supported by defined thresholds. A segment-based analytical approach enables classification as fully functional, selectively functional, or insufficiently functional. The framework is applied to the Freudenau fish pass (Danube River, Vienna), demonstrating how hydraulic and operational data can be integrated into a transparent and reproducible evaluation model for regulatory verification and long-term management.
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