Two subjects are chosen for discussions; one is the flow characteristics in a meandering compound channel with flat rigid and equilibrium rigid beds, and the other is the resistance of flows in compound channels.
Experimental results show that the flow parttern, the profiles of water surface and velocity are strongly affected by energy or momentum transfer between in-bank and over-bank flows.
An energy conservation equation is presented in order to evaluate the effects of interaction between the flows in main channel and flood plain to the flow resistence. A method is developed to predict the flow-depths, the mean velocities or the flow-discharges of main channel and flood plain. Its applicability is verified by flume data as well as by sensibility analysis.