Beach lowering

In addition to the three key problems above there is also an issue with beach lowering, which results in deeper water at the sea wall. 
This can result in higher wave forces acting on the wall increasing the damage sustained by the structure.  Higher waves may also increase wave overtopping. Lower beach levels will increase the risk of structures being undermined, leading to failure.  Foreshore lowering will also mean a reduction in the weight of material acting at the toe of the cliff, which could contribute to stabilisation issues.