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SLOVENSKI STANDARD
01-marec-2023
Navodila za določanje merilne negotovosti v hidrometriji (HUG) (ISO 25377:2020)
Hydrometric uncertainty guidance (HUG) (ISO 25377:2020)
Leitfaden zu Messunsicherheiten in der Hydrometrie (HUG) (ISO 25377:2020)
Lignes directrices relatives à l'incertitude en hydrométrie (ISO 25377:2020)
Ta slovenski standard je istoveten z: EN ISO 25377:2022
ICS:
17.120.20 Pretok v odprtih kanalih Flow in open channels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 25377
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2022
EUROPÄISCHE NORM
ICS 17.120.20
English Version
Hydrometric uncertainty guidance (HUG) (ISO
25377:2020)
Lignes directrices relatives à l'incertitude en Leitfaden zu Messunsicherheiten in der Hydrometrie
hydrométrie (ISO 25377:2020) (HUG) (ISO 25377:2020)
This European Standard was approved by CEN on 20 December 2022.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 25377:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
The text of ISO 25377:2020 has been prepared by Technical Committee ISO/TC 113 "Hydrometry” of
the International Organization for Standardization (ISO) and has been taken over as EN ISO 25377:2022
by Technical Committee CEN/TC 318 “Hydrometry” the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2023, and conflicting national standards shall be
withdrawn at the latest by June 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 25377:2020 has been approved by CEN as EN ISO 25377:2022 without any modification.
INTERNATIONAL ISO
STANDARD 25377
First edition
2020-12
Hydrometric uncertainty guidance
(HUG)
Lignes directrices relatives à l'incertitude en hydrométrie
Reference number
ISO 25377:2020(E)
©
ISO 2020
ISO 25377:2020(E)
© ISO 2020
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.
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Email: [email protected]
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Published in Switzerland
ii © ISO 2020 – All rights reserved
ISO 25377:2020(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 ISO/IEC Guide 98-3 (GUM) — Basic definitions and rules . 3
5.1 General . 3
5.2 Uncertainty of sets of measurements . 3
5.3 Random and systematic effects . 4
5.4 Uncertainty models — Probability distributions . 5
5.5 Combining uncertainties — Law of propagation of uncertainties . 5
5.6 Expressing results . 6
6 Open channel flow — Velocity area methods . 6
6.1 General . 6
6.2 Mean velocity, V . 7
x
6.3 Velocity-area method for discharge calculation . 8
6.4 Measurement of velocity . 9
6.5 Uncertainty associated with the velocity-area method . 9
6.5.1 General. 9
6.5.2 Random and systematic effects .11
**
6.6 Integration uncertainties uF ,uF .11
()
()
yz
6.6.1 General.11
6.6.2 Vertical scanning uncertainties .11
6.6.3 Horizontal scanning uncertainties .12
6.7 Perimeter flow uncertainties, uQ .12
()
p
7 Open channel flow — Critical depth methods .13
7.1 General .13
7.2 Head and geometry determination .13
7.3 Iterative calculation .14
7.4 Evaluating uncertainty .14
8 Dilution methods .15
8.1 General .15
8.2 Continuous feed .15
8.3 Transient mass .17
9 Hydrometric instrumentation .18
9.1 Performance specifications .18
9.2 Validity of uncertainty statements .18
9.3 Manufacturer’s specifications .19
9.4 Performance guide for hydrometric equipment for use in technical standard examples.20
10 Guide for the drafting of uncertainty clauses in hydrometric standards .21
10.1 General .21
10.2 Equipment, methods and measurement systems .21
10.2.1 General.21
10.2.2 Equipment .21
10.2.3 Methods .21
10.2.4 Systems .22
ISO 25377:2020(E)
11 Examples .22
11.1 General .
...