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The Author is to be congratulated on a useful paper that is of importance to every hydraulician engaged in flume experiments. Anyone working in the field of sediment transportation will have encountered the vexed problem of determining the appropriate bed shear velocity. It is surprising that the subject of non-uniform boundary shear distribution has attracted so little attention over the years, despite its fundamental importance and relevance to a number of open channel flow problems. The Author's experimental results are therefore most welcome. 34. The distribution of boundary shear stress over the wetted perimeter in open rectangular channels has been studied by a number of people; two important references are the work of Wagnerl* and G0nchar0v.l~ These represent studies in laminar and turbulent flow respectively. Goncharov's experimental results (chapter IV) have direct application to runs 16-20, in which the whole of the channel walls were of the same roughness but of different roughness from the channel bed. Since Goncharov has proposed equations defining the distribution of boundary shear stress, both with and without secondary flows, it is relevant to compare his results with those of the Author. A brief outline of his theoretical approach is given before comparing both sets of experimental results.

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