Rubble revetments are constructed of one or more layers of stone or concrete pieces derived from
the demolition of sidewalks, streets, and buildings (Figures 21 and 22). Stone revetments are constructed
of either two layers of uniform-sized pieces (quarrystone) or a gradation of sizes between upper or lower
limits (riprap). Riprap revetments are somewhat more difficult to design and inspect because of the
required close control of allowable gradations and their tendency to be less stable under large waves.
They are, however, acceptable for the majority of low cost shore protection applications. In either case,