Rip Rap is a shoreline protection method using multiple rocks, normally made from limestone or granite that are loosely placed together to stabilize shorelines.
A good solution is typically clean fieldstone or quarry stone with a diameter of no less than 6 inches and no greater than 48 inches. It takes specialized equipment and operators to position Rip Rap to ensure proper flow and shoreline protection. Landshore® often adds a porous liner underneath the Rip Rap to prevent washouts and destabilization during floods.
The primary purpose of Rip Rap is that of a defense mechanism. The rocks absorb the impact of energy from water or waves by capturing or trapping water in the gaps between the rocks which allows for slow drainage. As a secondary measure, Rip Rap is used behind or in front of old seawalls and bulkheads for added protection at the base. Although labor intensive, Rip Rap is a popular solution for erosion control.
These two images reflect a unique creek project in Gainesville, FL, where Rip Rap was used to create flood pools to stabilize the side banks and slow down water velocity. The size of Rip Rap rocks are calculated based on velocity flow or wave action on a waterbody. This particular project was the first of its kind for a creek in Florida.