ISO 19234:2024

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 19234
ISO/TC 113/SC 2
Hydrometry — Low cost baffles to
Secretariat: BSI
aid fish passage on triangular profile
Voting begins on:
2023-12-13 gauging weirs
Voting terminates on:
Hydrométrie — Chicanes à faible coût pour faciliter le passage des
2024-02-07
poissons par les déversoirs à profil triangulaire
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 19234:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

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ISO/FDIS 19234:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 19234
ISO/TC 113/SC 2
Hydrometry — Low cost baffles to
Secretariat: BSI
aid fish passage on triangular profile
Voting begins on:
gauging weirs
Voting terminates on:
Hydrométrie — Chicanes à faible coût pour faciliter le passage des
poissons par les déversoirs à profil triangulaire
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 19234:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

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ISO/FDIS 19234:2023(E)
Contents  Page
Foreword .iv
Introduction .v
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4  Symbols . 3
5  Principles . 4
5.1 General principles . 4
5.2 Crump weirs — Structures that conform to ISO 4360 . 5
5.3 Flat­V weirs — Structures that conform to ISO 4377 . 5
5.4 Suitability for fish species . 6
6  Installation — General considerations .
...

ISO/FDIS 19234:2023(E)
Date: 2023-10-13
ISO/TC 113/SC 2
Secretariat: BSI
Hydrometry — Low-cost baffles to aid fish passage on triangular profile gauging weirs

FDIS stage
First edition
Date: 2023-11-28

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ISO/FDIS 19234:2023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland.
ii © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 19234:2023(E)
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Principles . 4
5.1 General principles . 4
5.2 Crump weirs — Structures that conform to ISO 4360 . 5
5.3 Flat-V weirs — Structures that conform to ISO 4377 . 7
5.4 Suitability for fish species . 8
6 Installation — General considerations . 9
6.1 Site selection and application . 9
6.2 Baffle dimensions . 11
6.3 Baffle material and construction . 13
6.4 Limitations for baffle installations . 14
7 Installation at Crump weir — Weirs that conform to ISO 4360 . 16
7.1 General baffle arrangements for Crump weirs . 16
7.2 Location of the first baffle on Crump weirs . 21
7.3 Limitations for baffle installations on Crump weirs . 21
8 Installation at flat-V weir — Weirs that conform to ISO 4377 . 22
8.1 General baffle arrangements for flat-V weirs . 22
8.2 Location of the first baffle on flat-V weirs . 30
8.3 Limitations for baffle installations on flat-V weirs . 30
9 Maintenance considerations . 32
Bibliography . 33

© ISO 2023 – All rights reserved iii

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ISO/FDIS 19234:2023(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 carr
...