Abstract
The article deals with the questions of the contribution of suspended sediment in the processes of formation of the channel, and includes several formulas of suspended sediment discharge calculation and the results of calculations by these formulas. An analytical formula of sediments, in which the absolute exponent of the degree of arguments is equal to one shown the lower error probability. The calculated probability of calculation error is explicitly related to the average relative deviation between the calculated and observed values of sediment flow: the formulas with a lower error probability show better correspondence to the observed values. At the same time, the parameters of the analytical formula of sediment flow integral with respect to the type of bottom sediments represent a more stable dependence of the hydraulic variables of the flow state and sediments in contrast to the formulas of a similar purpose with data on sediment size included in them. This is explained by the fact that even quantum estimates of particle size are often unreliable and have high variability within one phase of water content, whereas the parameters focused on the qualitative state of the system (category of sediment size) characterize the properties of the bottom soil on average (integrally) over the cross-section of the flow.
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