In some cases there is impaction, and in others Comminution of the fragments.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition."
Alexander Miles Alexis Thomson
But the geographical effects of the action of torrents are not confined to erosion of earth and Comminution of rock; for they and the rivers to which they contribute transport the debris of the mountains to lower levels and spread them out over the dry land and the bed of the sea, thus forming alluvial deposits, sometimes of a beneficial, sometimes of an injurious, character, and of vast extent.
"The Earth as Modified by Human Action"
George P. Marsh