Riprap

Riprap, also known as rip rap, rip-rap, shot rock, rock armor, or rubble, is man-placed rock or other material used to armor shorelines, streambeds, bridge abutments, pilings and other shoreline structures against scour and water, wave, or ice erosion. Common rock types used include granite and modular concrete blocks. Rubble from building and paving demolition is sometimes used.

Riprap is also used underwater to cap immersed tubes sunken on the seabed to be joined into an undersea tunnel.

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