Published by ICE Publishing, 40 MarshWall, London E14 9TP.

Distributors for ICE Publishing books are

USA: Publishers Storage and Shipping Corp., 46 Development Road,

Fitchburg, MA 01420

www.icevirtuallibrary.com

A catalogue record for this book is available from the British Library

© Thomas Telford Limited 2011

ICE Publishing is a division of Thomas Telford Ltd, a whollyowned

subsidiary of the Institution of Civil Engineers (ICE).

All rights, including translation, reserved. Except as

permitted by the Copyright, Designs and Patents Act 1988,

no part of this publication may be reproduced, stored in a

retrieval system or transmitted in any form or by any means,

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