ISO INTERNATIONAL STANDARD 15769 First edition 2010-04-15 Hydrometry Guidelines for the application of acoustic velocity meters using the Doppler and echo correlation methods Hydrometrie — Lignes directrices pour I'application des compteurs de vitesse ultrasoniques fixes utilisant I'effet Doppler et la correlation d'échos Reference number ISO 15769:2010(E) @ ISO 2010 py IHS under ted without license from IHS Not for Resale ISO15769:2010(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, isO's member body in the country of the requester. ISO copyright office Case postale 56CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ Iso 2010 - All rights reserved ed without license from IHS Not for Resale ISO 15769:2010(E) Contents Page Foreword 1 Scope 2 Normative references.. 3 Terms, definitions and abbreviated terms.... 3.1 Terms and definitions .... 3.2 Abbreviated terms ... 4 Principles of operation of the techniques... 4.1 Uitrasonic Doppler .... 4.2 Operating techniques.. 4.3 Bed-mounted Doppler systems .... 4.4 Side-looking/horizontal ADCPs .6 4.5 Acoustic (echo) correlation method.... 4.6 Velocity-index ratings .. 5 Factors affecting operation and accuracy.. 11 5.1 General. 5.2 Characteristics of the instrument .... 11 5.3 Channel and water characteristics 16 5.4 Effect of weed ... 20 6 Site selection .20 6.1 General. 20 6.2 6.3 Bed-mounted ultrasonic Doppler and echo correlation devices ... 21 6.4 Side-lookers ... 22 7 Measurements .... 22 7.1 .22 7.2 7.3 Determination of cross-sectional area... .23 8 Installation, operation and maintenance.... 23 8.1 Installation considerations .... 23 8.2 9 Calibration, evaluation and verification . 26 9.1 General, 26 9.2 Calibration and performance checking.... 26 10 Determination of discharge. .27 10.1 General 27 10.2 Veiocity-index ratings .. 11 Uncertainties in discharge determinations..... 32 11.1 General .. 11.2 Definition of uncertainty ..... 32 11.3 General expectations of performance...... 11.4 Methodology of estimating the uncertainty in discharge determination . 33 12 Points to consider when selecting equipment.... Annex A (informative) Selection considerations for ultrasonic Doppler and echo correlation devices. 39 Annex B (informative) Practical considerations 41 CopyrightInenationalOganzansadardizaloghtsreserved ili ted without license from IHS Not for Resale ISO 15769:2010(E) Annex C (informative) Introduction to measurement uncertainty... Annex D (informative) Performance guide for hydrometric equipment for use in technical standards... ..53 Annex E (informative) Sample questionnaire - Doppler- and echo-correlation-based flowmeters....56 Bibliography ..61 @ ISo 2010 - Allrights reserved vided by IHS under lic ted without license from IHS Not for Resale ISO 15769:2010(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO International Electrotechnical Commission