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Andrew'shome Oct 6
Andrew'shome Oct 6
You Tube Seawall crop pic
You Tube Seawall crop pic

Click the link to see the whole aerial video of failing/failed seawalls on Mersea Island, Essex

Over-topped seawall
Over-topped seawall

This damaged seawall shows how the clay is scoured out from the rear face as a high tide over-tops the wall... it is the increased speed of the water running down the rear slope that does the damage, and can quickly eat through the whole wall, creating a full blown breach.