Riprap
Fishing
A man-made stretch of rocks or material of a hard composition that usually extends above and below the shoreline, often found near dams of big impoundments.
Water
A layer of large uncoursed stones, broken rock, boulders, precast blocks, bags of cement, or other suitable material generally placed in random fashion on the upstream and downstream faces of embankment dams, stream banks, on a reservoir shore, on the sides of a channel, or other land surfaces to protect them from erosion or scour caused by current, wind, wave, and/or ice action. A protective blanket of large loose stones, which are usually placed by machine to achieve a desired configuration. Riprap is usually placed by dumping or other mechanical methods but, in some cases, is hand placed. It consist of relatively large pieces as distinguished from a gravel blanket. Very large riprap is sometimes referred to as "armoring."