BS ISO 4360:2020
$167.15
Hydrometry. Open channel flow measurement using triangular profile weirs
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 40 |
This document specifies methods for the measurement of the flow of water in open channels under steady flow conditions using triangular profile weirs. The flow conditions considered are steady flows which are uniquely dependent on the upstream head and non-modular (drowned) flows which depend on downstream as well as upstream levels.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 7 | Foreword |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols |
| 10 | 5 Principle 6 Installation 6.1 General 6.2 Selection of site |
| 11 | 6.3 Installation conditions 6.3.1 General |
| 12 | 6.3.2 Measuring structure |
| 13 | 6.3.3 Approach channel 6.3.4 Downstream channel |
| 14 | 7 Maintenance 8 Measurement of head(s) 8.1 General 8.2 Location of head measurement(s) 8.2.1 Modular (free) flow 8.2.2 Non-modular (drowned) flow |
| 15 | 8.3 Gauge wells |
| 17 | 8.4 Zero setting |
| 18 | 8.5 Dimensions 9 Discharge characteristics 9.1 Formulae of discharge 9.1.1 Modular (free) flow |
| 19 | 9.1.2 Non-modular flow 9.2 Coefficients 9.2.1 Coefficient of discharge, Cd 9.2.2 Coefficient of velocity for modular flow, Cv 9.2.3 Non-modular flow reduction factor, f, with crest tappings 9.2.4 Non-modular flow reduction factor, f, with tailwater recorder |
| 20 | 9.3 Limitations 10 Uncertainties of flow measurement 10.1 General |
| 21 | 10.2 Combining measurement uncertainties |
| 22 | 10.3 Uncertainty of discharge coefficient u(Cd) for the triangular profile weir 10.4 Uncertainty budget |
| 23 | 11 Example 11.1 General 11.2 Characteristics — Gauging structure 11.3 Characteristics — Gauged head instrumentation 11.4 Discharge coefficient |
| 24 | 11.5 Discharge calculation 11.6 Uncertainty statement |
| 26 | Annex A (informative) Introduction to measurement uncertainty |
| 34 | Annex B (informative) Sample measurement performance for use in hydrometric worked examples |
| 37 | Annex C (informative) Spreadsheet for use with this document |
| 38 | Bibliography |
