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Overseas brief: Concrete sea defences

Many of the world's concrete sea defences were built nearly 100 years ago and are at risk of failure from hidden scour cavities, the latest issue of the ICE Water and Maritime Engineering journal reports. It highlights a new, cost effective radar technique for detecting such cavities and successful trials on a 260m long sea wall at Rhyl in North Wales. Copies can be obtained from the ICE library +44 (0)20 7665 2251 for a minimum fee of ú5. For information contact Simon Fullalove +44 (0)20 7665.

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