EROSION is a problem of considerable complexity which cannot readily be expressed in terms of known physical laws. Up to the present, it has lain mainly in the sphere of the engineer, who has evolved a number of empirical laws for predicting its magnitude. It is evident by the disagreement not merely in coefficients but even in the functions on which the erosion is made to depend, that these rules are designed only to fit the conditions which fall within the experience of particular engineers and have no universal application. Before further progress can be made in combating the evil, one must attempt to reduce the problem to its simplest proportions.
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Geological Magazine (1957)