ISO INTERNATIONAL STANDARD 13550 First edition 2002-04-01 Hydrometric determinations Flow measurements in open channels using structures Use of vertical underflow gates Determinations hydrometriques-Mesure de debit dans les canaux decouverts au moyen de structuresEmploi deportes verticales a passage subaquatique Reference number ISO 13550:2002(E) ISO2002 Copyright Intem mational Organization for Standardizatior No reproduction or networking permited without icense from IHS Not for Resale ISO13550:2002(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 downloading 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 @ISO2002 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 Casepostale56:CH-1211Geneva20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.ch Printed in Switzerland ISo 2002- All rights reserved Copyriahtltematinal Oonganizatinfor Standardizaion No reproduction or networking pemmited without license from IHS Not for Resale ISO13550:2002(E) Contents Page Foreword. iv 1 Scope... 2 Normativereferences. 3 Terms, definitions and symbols. 4 Units of measurement. 5 General requirements. 5.1 General.... 5.2 Site selection... 5.3 Installation conditions.. 6 Maintenance 7 Measurement of head. 7.1 7.2 Stilling or float well. 7.3 Zero setting .. 8 Vertical underflow gates. 8.1 Description of vertical underflow gates 8.2 Locationof theheadmeasurementsection ... 8.3 Locationofthetailwaterlevel measurementsection. 8.4 8.5 Operationalrequirements and recommendations. 9 Discharge relationships. 9.1 Discharge equations and coefficients for two-dimensional flow 9 9.2 Three-dimensional gate flow ... 13 9.3 Limits of application..... 9.4 Uncertainty of measurement .. 15 9.5 Example of computation .... 10 17 10.1 General.... 10.2 Sources oferror. 17 10.3 Kinds of error. 18 10.4 Uncertainties 18 10.5 Presentation of results 20 10.6 Examples 20 Bibliography 22 ili ed by IHS under Noreproductionar networking permited without license from IHS Not for Resale ISO 13550:2002(E) Foreword member bodies). The work of preparing International Standards is normally carried out through ISO technical committees.Eachmemberbody interested ina subjectfor whichatechnical committee hasbeen establishedhas liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. bythe technical committeesare circulated to the memberbodies for voting.Publication as an International ISO13550was preparedbyTechnical Committee ISO/TC 113, Hydrometric determinations, Subcommittee SC2, Notches, weirs and flumes. @ ISO 2002 - All rights reserved nal Organization for Standardizatio Not for Resale INTERNATIONAL STANDARD ISO13550:2002(E) HydrometricdeterminationsFlowmeasurementsinopen channels using structures Use of vertical underflow gates 1 Scope This International Standard specifies methods for the determination of discharge in open channels in steady flow modular conditions. NOTE Generally, gate controls are not designe