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BS EN ISO 25377:2022 2023

BS EN ISO 25377:2022 2023

$215.11

Hydrometric uncertainty guidance (HUG)

Published By Publication Date Number of Pages
BSI 2023 82
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This document provides an understanding of the nature of measurement uncertainty and its significance in estimating the “quality” of a measurement or a determination in hydrometry.

This document is applicable to flow measurements in natural and man-made channels. Rainfall measurements are not covered.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
7 Foreword
8 Introduction
11 1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
13 5 ISO/IEC Guide 98-3 (GUM) — Basic definitions and rules
5.1 General
5.2 Uncertainty of sets of measurements
14 5.3 Random and systematic effects
15 5.4 Uncertainty models — Probability distributions
5.5 Combining uncertainties — Law of propagation of uncertainties
16 5.6 Expressing results
6 Open channel flow — Velocity area methods
6.1 General
17 6.2 Mean velocity, 
18 6.3 Velocity-area method for discharge calculation
19 6.4 Measurement of velocity
6.5 Uncertainty associated with the velocity-area method
6.5.1 General
21 6.5.2 Random and systematic effects
6.6 Integration uncertainties 
6.6.1 General
6.6.2 Vertical scanning uncertainties
22 6.6.3 Horizontal scanning uncertainties
6.7 Perimeter flow uncertainties, 
23 7 Open channel flow — Critical depth methods
7.1 General
7.2 Head and geometry determination
24 7.3 Iterative calculation
7.4 Evaluating uncertainty
25 8 Dilution methods
8.1 General
8.2 Continuous feed
27 8.3 Transient mass
28 9 Hydrometric instrumentation
9.1 Performance specifications
9.2 Validity of uncertainty statements
29 9.3 Manufacturer’s specifications
30 9.4 Performance guide for hydrometric equipment for use in technical standard examples
31 10 Guide for the drafting of uncertainty clauses in hydrometric standards
10.1 General
10.2 Equipment, methods and measurement systems
10.2.1 General
10.2.2 Equipment
10.2.3 Methods
32 10.2.4 Systems
11 Examples
11.1 General
11.2 Uncertainty in water level measurement
11.2.1 Example 1: Float/shaft encoder sensor installed in stilling well at gauging station
33 11.2.2 Example 2: Pressure transmitter installed in tube
11.3 Uncertainty in flow measurement using flow measurement structures
36 11.4 Uncertainty in flow measurement by current meter
41 Annex A (informative) Introduction to hydrometric uncertainty
58 Annex B (informative) Introduction to Monte Carlo Simulation (MCS)
63 Annex C (informative) Interpolated Variance Estimation (IVE) method
67 Annex D (informative) Performance guide for hydrometric equipment for use in technical standard examples
70 Annex E (informative) Uncertainty analysis of stage-discharge relation
74 Annex F (informative) Measurement of velocity
79 Bibliography

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BS EN ISO 25377:2022 2023
$215.11