CEN ISO/TS 25377:2007
(Main)Hydrometric uncertainty guidance (HUG) (ISO/TS 25377:2007)
Hydrometric uncertainty guidance (HUG) (ISO/TS 25377:2007)
ISO/TS 25377:2007 provides an understanding of the nature of measurement uncertainty and its significance in estimating the quality of a measurement or a determination in hydrometry. It is applicable to flow measurements in natural and man-made channels. Rainfall measurements are not covered.
Leitfaden zu Messunsicherheiten in der Hydrometrie (HUG) (ISO/TS 25377:2007)
Diese Technische Spezifikation bietet einen Beitrag zum Verständnis der Natur der Messunsicherheit und deren Bedeutung bei der Abschätzung der „Qualität“ einer Messung oder einer Bestimmung in der Hydrometrie.
Sie gilt für Abflussmessungen in natürlichen und künstlichen Gerinnen. Messungen der Niederschlagsmenge werden nicht berücksichtigt.
Lignes directrices relatives à l'incertitude en hydrométrie (ISO/TS 25377:2007)
Navodila za določevanje merilne negotovosti v hidrometriji (ISO/TS 25377:2007)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2007
1DYRGLOD]DGRORþHYDQMHPHULOQHQHJRWRYRVWLYKLGURPHWULML ,6276
Hydrometric uncertainty guidance (HUG) (ISO/TS 25377:2007)
Leitfaden zu Messunsicherheiten in der Hydrometrie (HUG) (ISO/TS 25377:2007)
Lignes directrices relatives a l'incertitude en hydrométrie (ISO/TS 25377:2007)
Ta slovenski standard je istoveten z: CEN ISO/TS 25377:2007
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.
TECHNICAL SPECIFICATION
CEN ISO/TS 25377
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
October 2007
ICS 17.120.20
English Version
Hydrometric uncertainty guidance (HUG) (ISO/TS 25377:2007)
Lignes directrices relatives à l'incertitude en hydrométrie Leitfaden zu Messunsicherheiten in der Hydrometrie (HUG)
(ISO/TS 25377:2007) (ISO/TS 25377:2007)
This Technical Specification (CEN/TS) was approved by CEN on 2 August 2007 for provisional application.
The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.
CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN ISO/TS 25377:2007: E
worldwide for CEN national Members.
Contents Page
Foreword.3
Foreword
This document (CEN ISO/TS 25377:2007) has been prepared by Technical Committee CEN/TC 318
"Hydrometry", the secretariat of which is held by BSI, in collaboration with Technical Committee ISO/TC 113
"Hydrometric determinations".
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
TECHNICAL ISO/TS
SPECIFICATION 25377
First edition
2007-10-01
Hydrometric uncertainty guidance (HUG)
Lignes directrices relatives à l'incertitude en hydrométrie
Reference number
ISO/TS 25377:2007(E)
©
ISO 2007
ISO/TS 25377:2007(E)
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ii © ISO 2007 – All rights reserved
ISO/TS 25377:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 1
4 Symbols and abbreviations . 2
5 ISO/IEC Guide 98 (GUM) — Basic definitions and rules. 4
5.1 General. 4
5.2 The uncertainty of sets of measurements. 4
5.3 Random and systematic effects. 4
5.4 Uncertainty models — Probability distributions . 5
5.5 Combining uncertainties — The law of propagation . 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 determination. 8
6.4 Stationary determination of velocity. 9
6.5 Moving determination of velocity. 10
6.6 Velocity-area uncertainties. 11
**
⎡⎤
6.7 Integration uncertainties uF ,uF . 15
()
()
yz
⎣⎦
6.8 Perimeter flow uncertainties, uQ . 16
()
p
7 Open channel flow — Critical depth methods . 16
7.1 General. 16
7.2 Head and geometry determination. 17
7.3 Iterative calculation. 18
7.4 Evaluating uncertainty . 18
8 Dilution methods. 18
8.1 General. 18
8.2 Continuous feed. 19
8.3 Transient mass. 20
9 Hydrometric instrumentation . 21
9.1 Performance specifications. 21
9.2 Validity of uncertainty statements . 21
9.3 Manufacturer’s performance specifications . 22
9.4 Performance guide for hydrometric equipment for use in technical standard examples . 23
10 Guide for the drafting of uncertainty clauses in hydrometric standards . 24
10.1 General. 24
10.2 Equipment, methods and measurement systems. 24
Annex A (informative) Introduction to hydrometric uncertainty . 26
Annex B (informative) An introduction to Monte Carlo Simulation (MCS). 43
Annex C (informative) Performance guide for hydrometric equipment for use in technical
standard examples . 48
Bibliography . 51
ISO/TS 25377:2007(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
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
In other circumstances, particularly when there is an urgent market requirement for such documents, a
technical committee may decide to publish other types of normative document:
⎯ an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in
an ISO working group and is accepted for publication if it is approved by more than 50 % of the members
of the parent committee casting a vote;
⎯ an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical
committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting
a vote.
An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a
further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is
confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an
International Standard or be withdrawn.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO/TS 25377 was prepared by the European Committee for Standardization (CEN) Technical Committee
CEN/TC 318, Hydrometry, in collaboration with Technical Committee ISO/TC 113, Hydrometry, in accordance
with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
iv © ISO 2007 – All rights reserved
ISO/TS 25377:2007(E)
Introduction
The management of a natural environment requires knowledge, by measurement, of what is happening. Only
then can effective action be taken and the effectiveness of the action assessed. Much depends on the quality
of the knowledge itself.
The quality of measurable knowledge is stated in terms of measurement uncertainty. The internationally
agreed method for assessing measurement quality is the Guide
...
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