New experimental data on plan dimensions for riprap mattresses used in pile group protection against edge failure are analyzed.\r\nThe influence of flow conditions and the distance between piles in plan dimensions of riprap mattresses are addressed. An\r\nalternative methodology for the experimental study of edge failure in pile groups is proposed and verified, significantly reducing\r\nthe duration of tests (from several days to a few hours) and yielding similar results. For the pile group configuration tested, a\r\ndesign expression for minimum riprap width is obtained. The influence of the distance between the piles on the width of riprap\r\ndimensions is shown to be small, and the proposed expression compares well with some of the expressions for single piers found\r\nin the literature.
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