Abstract
Implementing new concepts and measures for flood risk management may be restricted by hydromechanical processes. These processes govern the movement of water masses within rivers and their floodplains. Different hydraulic processes are still not fully understood or cannot be described satisfactorily by hydro‐numerical models due to uncertainty in input data. The choosing of the correct surface roughness has a huge influence on the results of hydro‐numerical calculation of historical and design flood events and their reliability for the assessment of flood risk mitigation measures like floodplain restoration. The authors try to outline the various effects of channel and floodplain roughness on fluvial flood routing and give examples. A method is presented for peak discharge calculation of historical flood events.
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