THE laws governing stable silt-transporting rivers and canals in erodible material are admittedly so complex that it is with some diffidence that the Author puts forward a new general theory of silt-transportation. The subject is, however, of such importance t.hat little apology is required for a renewed attack on a problem that of late years has demanded increased attention. It is not D the vertical depth of water, and f a silt factor, This traditional figure applies properly only to a stream of uniform depth and unlimited bed-width. It is necessary to poict out this S 2 Downloaded by [ UNIVERSITY OF BATH] on [11/09/16].It might possibly be more rational to assume that all the formulas are of value in respect of the particular set of conditions to which they refer, and that the differences, or more properly, discrepancies, in the values of the index assigned to the vertical depth D are inherent in the method of treatment adopted.2Had the values of the velocity, for example, been plotted against

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