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Certain fine-grained soils in nature are highly erodible (dispersive soils). These soils have a higher content of dissolved sodium in the pore water than ordinary soils. They erode by a process in which the individual colloidal clay particles go into suspension in practically still water, whereas the erosion process for ordinary clays is quite different, requiring considerable velocity in the eroding water.
Sherard et al. (Thu,) studied this question.