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BS ISO 4359:2022 – TC 2023

$279.50

Tracked Changes. Flow measurement structures. Rectangular, trapezoidal and U-shaped flumes

Published By Publication Date Number of Pages
BSI 2023 199
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PDF Catalog

PDF Pages PDF Title
1 30484909
111 A-30444408
112 undefined
117 Foreword
119 1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
121 5 Flume types and principles of operation
125 6 Installation
6.1 Selection of site
127 6.2 Installation conditions
6.2.1 General requirements
6.2.2 Flume structure
128 6.2.3 Approach channel
129 6.2.4 Downstream conditions
7 Maintenance
8 Measurement of head
8.1 General
8.2 Location of head measurement(s)
130 8.3 Gauge wells
8.4 Zero setting
9 General formulae for discharge
9.1 Discharge based on critical flow in the flume throat
132 9.2 Discharge based on observed upstream head
144 9.3 Calculation of stage–discharge relationships
145 9.4 Approach velocity and coefficient of velocity
147 9.5 Selection of flume size and shape
10 Rectangular-throated flume
10.1 Description
148 10.2 Location of head measurement section
10.3 Provision for modular flow
10.4 Evaluation of discharge for a given observed upstream head
152 10.5 Computation of stage–discharge relationship
10.6 Limits of application
153 11 Trapezoidal-throated flumes
11.1 Description
11.2 Location of head measurement section
154 11.3 Provision for modular flow
11.4 Evaluation of discharge — Coefficient method
157 11.5 Computation of stage–discharge relationship
159 11.6 Limits of application
160 12 U-throated (round-bottomed) flumes
12.1 Description
161 12.2 Location of head measurement section
12.3 Provision for modular flow
162 12.4 Evaluation of discharge — Coefficient method
166 12.5 Computation of stage–discharge relationship
168 12.6 Limits of application
169 13 Uncertainties of flow measurement
13.1 General
170 13.2 Combining measurement uncertainties
172 13.3 Percentage uncertainty of discharge coefficient u*(C) for critical-depth flumes
173 13.4 Uncertainty budget
14 Example of uncertainty calculations
14.1 General
14.2 Characteristics — Gauging structure
174 14.3 Characteristics — Discharge calculation
14.4 Characteristics — Discharge coefficient
14.5 Characteristics — Gauged head instrumentation
175 14.6 Characteristics — Throat width
14.7 Overall uncertainty in discharge
177 Annex A (informative) Simplified head discharge relationships for flumes
182 Annex B (informative) Introduction to measurement uncertainty
191 Annex C (informative) Sample measurement performance for use in hydrometric worked examples
194 Annex D (informative) Spreadsheets for use with this document
197 Bibliography
BS ISO 4359:2022 - TC 2023
$279.50