In the rooms of hydraulic laboratory of the Water research institute (VÚVH) the employees created physical model of the part of the river-branch system. The model optimalise the main parameters, position and configuration of crosswise structures with the aim to achieve optimal conditions of the stream. Using this model and following field measurements and calculations using numerical models it will be able to choose the most suitable measurements for realisations of the project activity C.1 „Restoration of the flow capacity and longitudinal continuity of Danube branch system“ and „Restoration of river branches lateral connectivity and water regime of wetlands“