BS ISO 3846:2008
Current
The latest, up-to-date edition.
Hydrometry. Open channel flow measurement using rectangular broad-crested weirs
Hardcopy , PDF
English
03-31-2008
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Installation
5.1 General
5.2 Selection of site
5.3 Installation conditions
6 General maintenance requirements
7 Measurement of head(s)
7.1 General
7.2 Stilling or float well
7.3 Zero setting
8 Rectangular broad-crested weirs
8.1 Specification for the standard weir
8.2 Location of the head gauge section
8.3 Provision for modular flow
9 Discharge relationships
9.1 Modular flow discharge equation
9.2 Modular coefficient of discharge
9.3 Limitations for operation in the modular
flow range
9.4 Drowned flow discharge equation
9.5 Limitations for operation in the drowned flow range
10 Uncertainties in flow measurement
10.1 General
10.2 Statement of the uncertainty of a flow
measurement in a channel
10.3 Combining measurement uncertainties
10.4 Uncertainty of discharge coefficient u(C) for the
broad-crested weir
10.5 Uncertainty budget
11 Example
11.1 General
11.2 Characteristics - Gauging structure
11.3 Characteristics - Gauged head instrumentation
11.4 The discharge coefficient
11.5 The discharge estimate
11.6 Uncertainty statement
Annex A (informative) - Modular limit
Annex B (informative) - Gauged head discharge coefficient
and total head discharge coefficient
Annex C (informative) - Introduction to measurement uncertainty
Annex D (informative) - Sample measurement performance for use
in hydrometric worked examples
Bibliography
Specifies requirements for the use of rectangular broad-crested weirs for the accurate measurement of flow of clear water in open channels under free flow conditions.
| Committee |
CPI/113
|
| DevelopmentNote |
Supersedes BS 3680-4E(1990). (03/2008)
|
| DocumentType |
Standard
|
| Pages |
36
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
This International Standard lays down requirements for the use of rectangular broad-crested weirs for the accurate measurement of flow of clear water in open channels under free flow conditions.
| Standards | Relationship |
| ISO 3846:2008 | Identical |
| ISO/IEC 17025:2005 | General requirements for the competence of testing and calibration laboratories |
| ISO 748:2007 | Hydrometry Measurement of liquid flow in open channels using current-meters or floats |
| ISO 1100-1:1996 | Measurement of liquid flow in open channels Part 1: Establishment and operation of a gauging station |
| ISO/TS 25377:2007 | Hydrometric uncertainty guidance (HUG) |
| ISO/TS 24154:2005 | Hydrometry Measuring river velocity and discharge with acoustic Doppler profilers |
| ISO 772:1996 | Hydrometric determinations — Vocabulary and symbols |
| ISO/IEC Guide 98-3:2008 | Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) |
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