An improperly designed hydroengineering constructions are the cause of many failures of hydraulics structures. The design solutions are verified in the physical models for emergency load conditions and in order to optimize complex shapes in the case of large hydroengineering constructions. The authors presented the research process of the designed weir at the inlet to flood channel Odra-Widawa with the aim of verifying the conditions for transmission of flood waters. The check of designed shapes of weir elements and efficiency of energy dissipation in the stilling basin according to the desired water levels was performed. Using vortex method the preliminary analysis of the water inflow into the weir were performed for determining the geometry of the model. Then tests on the physical model of the “fish-belly” flap were done to verify the assumptions adopted in the project and formulated conclusions and recommendations to the weir project.

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