ISO INTERNATIONAL STANDARD 18674-4 First edition 2020-06 Geotechnical investigation and testing - Geotechnical monitoring by field instrumentation - Part 4: Measurement of pore water pressure: Piezometers Reconnaissance et essais géotechniquesSurveillance géotechnique parinstrumentationinsitu Partie 4: Mesure de la pression interstitielle: Piézometres Reference number IS018674-4:2020(E) OST @IS02020 IS018674-4:2020(E) COPYRIGHTPROTECTEDDOCUMENT ISO2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting below or ISo's memberbody in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122749 0111 Email:[email protected] Website: www.iso.org Published in Switzerland i @ IS0 2020-All rights reserved