Want to rip-rap the outer edge of this water hole, so the bank will not cave in and undo all our work!
When the shield had traveled 25 ft. through the rip-rap, the piles which support the bulkhead were met.
The heavy masonry bulkhead was supported on piles and rip-rap, as shown in Fig. 18.
also riprap, "loose stone thrown down in water or soft ground as foundation," 1822, American English, perhaps connected with earlier nautical word rip-rap meaning "stretch of rippling water" (often caused by underwater elevations), 1660s, probably of imitative origin (cf. riprap "a sharp blow," 1570s).