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Sea Walls as a Coastal Defence Seawalls are impermeable structures designed to provide a defence against the action of the sea. They are often made of concrete and vary in shape depending on when they were designed and the local conditions. Some will have vertical walls that tends to result in spray coming over the wall and can have a detrimental effect upon the beach by reducing its height. Others will have a slope leading up to a curved wall that is designed to reduce the size of the wave reaching the wall and then to reflect it back out to sea. The difference in approaches to design can be seen when you compare the seawall at Crosby (built in the sixties) with the seawall at Southport ( built 1997 to 2002). Home Page - Top www.seftoncoast.org.uk

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