ISO INTERNATIONAL STANDARD 18325 First edition 2015-11-15 Geosynthetics Test method for the determination of water discharge capacity for prefabricated vertical drains Géosynthétiques - Méthode d'essai pour la détermination de la capacité de décharge d'eau des drains verticaux préfabriqués Reference number ISO 18325:2015(E) ISO @IS02015 IS0 18325:2015(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2015, Published in Switzerland All rights reserved. Unless otherwise specified, 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 on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISo's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax+4122 749 09 47 copyright@iso.org www.iso.org @ IS0 2015 - All rights reserved Copvriaht Inte IS0 18325:2015(E) Contents Page Foreword .iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions .1 4 Principle .2 5 Apparatus and materials ..2 6 Test specimens. .5 6.1 Handling. .5 6.2 Selection .5 6.3 Numberand dimensions .5 6.4 Specimen condition .5 7 Test procedure. ..5 8 Calculations and expressions of results .7 9 Test report 7 Annex A (informative) Determination of the correction factor Rr for conversion to a water temperature of 20 °C 8 Bibliography .10 mzsonta?Standardizannrightsreserved iii