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BS EN ISO 25377:2022 – TC 2023

BS EN ISO 25377:2022 – TC 2023

$280.87

Tracked Changes. Hydrometric uncertainty guidance (HUG)

Published By Publication Date Number of Pages
BSI 2023 196
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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
1 30469510
115 A-30328617
116 undefined
118 European foreword
Endorsement notice
121 Foreword
122 Introduction
125 1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
127 5 ISO/IEC Guide 98-3 (GUM) — Basic definitions and rules
5.1 General
5.2 Uncertainty of sets of measurements
128 5.3 Random and systematic effects
129 5.4 Uncertainty models — Probability distributions
5.5 Combining uncertainties — Law of propagation of uncertainties
130 5.6 Expressing results
6 Open channel flow — Velocity area methods
6.1 General
131 6.2 Mean velocity, 
132 6.3 Velocity-area method for discharge calculation
133 6.4 Measurement of velocity
6.5 Uncertainty associated with the velocity-area method
6.5.1 General
135 6.5.2 Random and systematic effects
6.6 Integration uncertainties 
6.6.1 General
6.6.2 Vertical scanning uncertainties
136 6.6.3 Horizontal scanning uncertainties
6.7 Perimeter flow uncertainties, 
137 7 Open channel flow — Critical depth methods
7.1 General
7.2 Head and geometry determination
138 7.3 Iterative calculation
7.4 Evaluating uncertainty
139 8 Dilution methods
8.1 General
8.2 Continuous feed
141 8.3 Transient mass
142 9 Hydrometric instrumentation
9.1 Performance specifications
9.2 Validity of uncertainty statements
143 9.3 Manufacturer’s specifications
144 9.4 Performance guide for hydrometric equipment for use in technical standard examples
145 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
146 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
147 11.2.2 Example 2: Pressure transmitter installed in tube
11.3 Uncertainty in flow measurement using flow measurement structures
150 11.4 Uncertainty in flow measurement by current meter
155 Annex A (informative) Introduction to hydrometric uncertainty
172 Annex B (informative) Introduction to Monte Carlo Simulation (MCS)
177 Annex C (informative) Interpolated Variance Estimation (IVE) method
181 Annex D (informative) Performance guide for hydrometric equipment for use in technical standard examples
184 Annex E (informative) Uncertainty analysis of stage-discharge relation
188 Annex F (informative) Measurement of velocity
193 Bibliography

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BS EN ISO 25377:2022 - TC 2023
$280.87