PublishedbyICEPublishing, 40 Marsh Wall, London E14 9TP.

DistributorsforICEPublishingbooksare USA: PublishersStorageandShippingCorp.,46DevelopmentRoad, Fitchburg, MA 01420

www.icevirtuallibrary.com A catalogue record for this book is available from the British Library ISBN:978-0-7277-5194-2

© Thomas Telford Limited 2011

ICEPublishingisadivisionofThomasTelfordLtd,awholly-owned subsidiary of the Institution of Civil Engineers (ICE).

Allrights,includingtranslation,reserved.Exceptaspermitted bytheCopyright,DesignsandPatentsAct1988,nopartof thispublicationmaybereproduced,storedinaretrievalsystem or transmitted in any form or by any means, electronic, mechanical, photocopying or otherwise, without the prior written permission of the Publisher, ICE Publishing, 40 Marsh Wall, London E14 9TP.

Thisbookispublishedontheunderstandingthattheauthoris solely responsible for the statements made and opinions expressed in it and that its publication does not necessarily imply that such statements and/or opinions are or reflect the views or opinions of the publishers. Whilst every effort has been made to ensure that the statements made and the opinions expressed in this publication provide a safe and accurate guide, no liability or responsibility can be accepted in this respect by the author or publishers.

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