The aim of this thesis is the comparison of the numerical bedload transport model HYDRO_GS-2D and a physical scale model. The task of both models was the simulation of a concentrated bedload extraction of the river Steyr for a better flood protection of the town of Steyr. The extraction is done by a side weir and an integrated bedload channel into a separate sidearm. The investigation area covered by the model extends over a river length of 1,200 m and a width of approximately 500 m. This area was modelled with a rectangular and triangular irregular network. The results demonstrated the reproduction of the functionality of the bedload trap by HYDRO_GS-2D. However there are differences in the distribution of the deposit. In particular, the intake area, including the side weir and the bedload channel, causes turbulent flow states, whereby the limits of the numerical model are illustrated. Considering the mathematical basis of the model HYDRO_GS-2D the bedload transportation and sedimentation can be predicted.