Revetment walls are permanent structures designed to prevent subsidence that commonly occurs adjacent to all waterways and the ocean. By definition a revetment structure is a protective covering on an embankment of earth designed to maintain the slope or to protect it from erosion. Most revetment walls are earth-retaining structures not unlike terrestrial walls, but revetments are also substantially exposed continuously to changing tidal water levels and erosion at the toe facing the water. In walls fronting rivers and flood canals, the latter provide a major cause for wall movement and failure.
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