ISO INTERNATIONAL STANDARD 2425 Third edition 2010-12-01 HydrometryMeasurement of liguid flow in open channels under tidal conditions Hydrometrie-Mesurage du débit des liquides dans les canaux déecouverts dans des conditions de marée Reference number ISO 2425:2010(E) @ ISO 2010 THS under Not for Resale ISO 2425:2010(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by Iso member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below COPYRIGHTPROTECTEDDOCUMENT @ISO2010 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or ISo's member body in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 4122 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IsO 2010 - All rights reserved I without license from IHS Not for Resale ISO2425:2010(E) Contents Page Foreword .iv 1 Scope 2 Normative reference 3 Terms and definitions . 4 Abbreviated terms 5 Principles of methods of measurement 5.1 General.... 5.2 Single measurement methods 5.3 Continuous measurement methods. 6 Special considerations and choice of method... 6.1 Specialconsiderations.. 6.2 Choice of method .. 7 Measurement of tidal flow ... 6 7.1 Techniques for single measurements of tidal flow.. 7.2 Techniques appropriate for continuous measurement of tidal flow. 10 8 Uncertainties in tidal flow measurement .. 12 8.1 General .... 12 8.2 Uncertainties in measurement by velocity area method.. 12 Annex A (informative) Measurement of tidal flow by cubature method.. 16 Annex B (informative) Measurement methods suitable for tidal flow conditions. .20 Annex C (informative) Record of velocity measurement of a tidal river (see 7.1), 22 Annex D (informative) Measurement of tidal flow using an acoustic Doppler velocity meter 24 Bibliography. Copyright International OrganizationfrStandardizalion'ghtsreserved ii from IHS Not for Resa