Riprap, also known as
rip rap,
rip-rap,
shot rock,
rock armour or
rubble, is
rock or other material used to
armor shorelines, streambeds, bridge abutments, pilings and other shoreline structures against
scour and water or ice erosion. It is made from a variety of rock types, commonly
granite or
limestone, and occasionally
concrete rubble from building and paving demolition. It can be used on any waterway or water containment where there is potential for water erosion.