Seawalls: An Overview Research Paper
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Seawalls are used primarily to protect areas in the rear of the beach against the effect of heavy storm action. They are necessarily massive and expensive. Seawalls limit the shoreward movement of the high water line, but under severe wave action they generally promote removal of sand from the beach by wave wash. Under normal wave action, this sand may be returned to the beach but the seawall has no capacity to retain the sand. The function of a seawall is to protect property and it has no value in stabilizing the beach. The layout of seawalls is generally parallel to the shore. They should be placed as far back of the normal high water line as the development in the rear will economically permit. The minimum distance from the high water line is dependent on the width of beach required. The alignment of seawalls should be as straight as possible. Necessary changes in direction should be accomplished by gradual smooth curves to avoid concentration of wave forces at angles.
DescriptionDrainage and Flood Protection/Flood Control Techniques. (204.4)
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Darby, William P. (1977). Seawalls: An Overview Research Paper. INTERTECT. Available electronically from