Large rocks or boulders placed to protect a slope or waterway bank from erosion.
A layer of large, loosely placed angular rock or stone used to protect soil surfaces from erosion caused by flowing water, wave action, or surface runoff. Riprap is commonly used at culvert outlets, stream banks, channel slopes, and at the base of retaining walls. Stone size is selected based on the velocity of water flow to prevent displacement.
Class I riprap was specified for the detention pond outlet to dissipate energy and prevent channel erosion downstream.
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