Due to increasing impervious surfaces and climate change, the frequency of high water is increasing in recent decades. In parallel, the damage produced by them also increases. The need for preparedness for such events and for constructing flood measures grows. Hydraulic analysis are necessary for the assessment of the flood hazard and for flood extension forecasting. In recent years the development of advanced computers increased the use of
complex 2D hydraulic models. The accuracy of such models largely dependents on topographic data, boundary conditions and model calibration process. In this report, a 2D
hydraulic modeling was done for the reach of the Drava in Malečnik, where high waters threaten public and private land. Hydraulic modeling software MIKE FLOOD, which
connects the MIKE 11 and MIKE 21 software was used. This research work also includes a sensitivity analysis of changing the roughness of the 2D hydraulic model on high waters, where the impact of the vegetation on flow conditions was also observed. Furthermore, flood
hazard maps were done and analysis of flood measures, which include the reduction of the vegetation as well.