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Karlsruhe, Germany

Like almost all over-topped gate types with low tailwater levels, inflatable dams may be problematic from an ecological point of view because fish passing downstream may be injured or killed if they come in contact with the weir sill. Using numerical and hydraulic studies, the critical range of discharge is identified and the relevant hydraulic parameters are estimated. Furthermore, structural and operational measures are investigated and evaluated to reduce the risk of injury during the downstream migration of fish across inflatable dams.

Due to the EU Water Framework Directive which claims undisturbed sediment transport in addition to undisturbed migration of aquatic organisms, weir design and choice of gates is increasingly being asked in current projects of replacement constructions. The objective of the paper is to contribute generally to the understanding of sediment transport through impoundments and particularly to quantify the influence of overflow and underflow gates on the sediment transport.

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