Abstract: A new method is proposed to estimate annual amount of bed load, in which the typical hydrological year of discharge series is selected based on the relationship between the bed load rate and hydraulic factors. The lateral non-uniform bed load transport along the cross section is accounted for by dividing the basic section into certain number of sub-sections in which the bed load rate is calculated in terms of local velocities. In addition, the timevariation of size grading of bed load is taking into consi...