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This paper summarises a research investigation carried out on behalf of the Environment Agency. The investigation was concerned with the adaptation of flow measurement structures, designed in accordance with British or International Standards, to aid the upstream migration of fish. It was intended to ensure that these adaptations do not significantly degrade the accuracy of the combined structure as a hydrometric device. The research provided specifications for adaptations to benefit fish migration without significantly affecting hydrometric performance. This paper focuses on the key findings from the research.

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