ISO INTERNATIONAL STANDARD 18365 First edition 2013-12-15 Hydrometry - Selection, establishment and operation of a gauging station Hydrométrie - Sélection, établissement et exploitation d'une station hydrométrique Reference number IS0 18365:2013(E) LSO IS02013 IHS under itted without license from IHS Not for Resale IS0 18365:2013(E) COPYRIGHTPROTECTEDDOCUMENT ISO2013 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 Case postale 56:CH-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 @ IS0 2013 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 18365:2013(E) Contents Page Foreword ..iv 1 Scope 1 2 Normative references .1 3 Terms, definitions and symbols 4 General requirements and considerations ..1 4.1 Requirements. .1 4.2 Other constraints. .2 5 Water level (Stage) only gauging stations .2 5.1 Preliminary survey and selection criteria .2 5.2 Stage measurement and recording .3 6 Stage-discharge gauging stations ..4 6.1 General 4 6.2 Main elements of a stage-discharge gauging station .5 7 Stage- discharge gauging stations using hydraulic structures. ..6 7.1 General .6 7.2 Siteselection ..6 7.3 Types of hydraulic structures. .6 8 Velocity-discharge gauging stations. .7 8.1 Applications and types of instrument .7 8.2 Siteselection .8 8.3 Calibration .8 8.4 Transit time (acoustic) method .8 8.5 Doppler .9 8.6 Acoustic (echo) correlation velocity meters .10 8.7 Electromagnetic method (Full channel width coil) .10 9 Measurement under difficult conditions .10 9.1 Ice and frost conditions. .10 9.2 Weedgrowth .11 9.3 Extreme sedimentation conditions .11 10 Operation and maintenance .11 10.1 General .11 10.2 Water level (Stage) only gauging stations 11 10.3 Stage-discharge gauging stations. .12 10.4 Stage-discharge gauging stations using hydraulic structures ..12 10.5 Velocity-discharge gauging stations. .12 Annex A (informative) Applicable conditions for selection of discharge measurement method....13 Bibliography .16 iii se with ISt ed without license from IHS Not for Resale