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Rip-rap is a method of reinforcing river banks to prevent erosion, particularly where this is caused by water hitting the bank with some force, or swirling round beside the bank. Rock is generally used, though sometimes logs will provide a good solution. Even when the gaps between the rocks are filled with gravel, and seeds or seedlings have been planted there, it can take up to two years before a bank stabilised with rip-rap looks natural and attractive.

This is an example of a degraded riverbank, which had been severely eroded to the point that the fence that was once on solid ground was left hanging in the air.












The picture below shows the same stretch of river after stabilisation of the riverbank with rock.