ISO INTERNATIONAL STANDARD 26906 Second edition 2015-10-15 Hydrometry Fishpasses at flow measurement structures Hydrometrie - Echelles a poissons aupres des structures mesurant le débit Reference number ISO 26906:2015(E) ISO International Organization for Standardization e=ZHEJIANG INST OF STANDARDIZATION C1 5956617 @IS02015 vided by IHS under I Not for Resale, 2016/1/8 02:39:26 No reproduction or networking permitted without license from IHS IS0 26906:2015(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. ISOcopyrightoffice Ch. de Blandonnet 8 · CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Internatinai br DrganizationforStandardization Licensee-ZHEJIANG INST OF STANDARDIZAISQ 0d5 - All rights reserved Not for Resale, 2016/1/8 02:39:26 networking permited withoutlicense from IHS IS0 26906:2015(E) Contents Page Foreword ..V Introduction. ..vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Symbols. ...2 5 Principle. ..4 6 Installation 6.1 Requirements for gauging structure and fishpass installations ..4 6.1.1 Selection of site ..4 6.1.2 Installation conditions .5 6.1.3 Upstream channel 6.1.4 Separate channel .6 6.1.5 Downstream channel 6.1.6 Flow measurement and fishpass structures 7 6.1.7 Maintenance 6.1.8 Measurement of head .8 6.2 Requirements specific to the fishpass. .8 6.2.1 General ..8 6.2.2 Guidelines for basic parameters of fishpasses .9 6.2.3 Location and attraction flows. .9 6.2.4 Downstream entry/exit to fishpass. .9 6.2.5 Upstream exit/entry from fishpass ..10 7 Fishpass performance. .10 7.1 General ..10 7.1.1 Types.... ..10 7.1.2 Fishpasses with interconnected pools ..10 7.1.3 Fishpasses with continuous energy dissipation 10 7.1.4 Calibration and discharge coefficient. 11 7.2 Larinier super-active baffle fishpass with baffle sizes between 75 mm and 150 mm ..11 7.2.1 Description. ..11 7.2.2 The foilowing features apply to the range of baffle sizes from 75 mm to 150mm. ..12 7.2.3 Limitations. .13 7.2.4 Modular flow calibration ..14 7.2.5 Modularlimit .15 7.3 Pool-type fishpass with V-shaped overfalls .15 7.3.1 Description. .15 7.3.2 Determination of discharge under free flow conditions 18 7.3.3 Modularlimit .21 7.3.4 Determination of discharge under submerged flow conditions .22 7.3.5 Limitations. 23 7.3.6 Scaling up to standard design. .23 7.4 Dutch pool and orifice fishpass. 23 7.4.1 Description. 23 7.4.2 Determination of discharge. 25 7.4.3 Scaling up the standard design. ..27 8 Computation of discharge ..27 8.1 Principles. ..27 8.2 Details. ..28 9 Uncertainties in flow determination ..28 ntemaional oganzation@sS25-All rights reserved iii ISee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under license with ISC ed without license from IHS Not for Resale, 2016/1/8 02:39:26