Abstract
A new model of discharge assessment for compound channel flows is proposed based on the characteristics of wall shear stress. It is originally assumed that there is no shear acting on imaginary interface plains between main channel and floodplains. Both subsections hold the equilibrium between gravity force and boundary shear force. The boundary shear force is a function of the floodplain width, main channel width and height, and the ratio of Manning's roughness on the floodplain to that in the main channel. It is confirmed that the proposed model can reproduce not only the discharge-stage curves obtained by authors' experiments but also another researchers' ones.
