The study of results of hydrometric measurements and the calculations of the unit energy stream of water in the lock of fish-pass were introduced in this work. The efficiency qualification of fish-pass was the aim of the work. Investigations were carried out in the day 10.11.2011 in the slotted fish-pass of the weir of the water reservoir in Zesławice on the river Dłubnia. It was affirm, that the ensure of the optimum conditions of fish migration throughout the fish-pass taking into account the flow velocity of water through the slots of fish-pass, there is only possible near the opening one inlet from the side of the upper water of the weir. It was showed that diverse hydraulic conditions in the individual lock of fish-pass were by the given flow, about what provide in the individual water depths and the considerable differentiation of the flow velocity in individual slots and the locks of fish-pass. The calculated unit energy stream of water E exceeds the permissible value E = 200 W ∙ m^–3, showing on the low efficiency of fish-pass.

91-100