Our knowledge in regard to suspended‐material transportation has been greatly increased in the last few years due to our more thorough understanding of the mechanics of turbulent flow. The vertical distribution of suspended material in rivers under equilibrium‐conditions, that is when there is no appreciable settling or scour, can be quite accurately predicted by the theory presented by O'Brien [see 1 of “References” at end of paper]. This theory permits the calculation of the total suspended material transported in a vertical section if the concentration at some one point, the velocity‐distribution, and the hydraulic characteristics of the river are known. The correctness of this equation for vertical distribution of suspended material under equilibrium‐conditions has been experimentally checked for artificial turbulence by Rouse [2]. Also, various data for natural rivers verify the theory quite well.
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A. A. Kalinske (1940) studied this question.
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