BS ISO 4359:2022 – TC 2023
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Tracked Changes. Flow measurement structures. Rectangular, trapezoidal and U-shaped flumes
Published By | Publication Date | Number of Pages |
BSI | 2023 | 199 |
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 |