Taking into account the kinematic effect in methods used for computation of the floodplain riverbeds discharge capacity

Analysis of several methods used for computation of the discharge capacity of floodplain riverbeds showed necessity of taking into account the kinematic effect. This can be done by using the most promising yet not enough developed methodology that is based on the simultaneous equations that describe motion of a stream, mass of which varies along its length. Performed experiments allowed obtaining the correlation between the inertial terms of this equation system, the stream depth and the angle between the divergent dynamic axes of interacting flows. Their maximum values are 80.1 and 24.2%; thus, they are quite significant.