Standard
Track updates
AS 4747.3:2025
[Current]Metering systems for non-urban water supply, Part 3: Technical requirements for open
channel metering systems
AS 4747.3:2025 sets out the technical requirements for non-urban metering systems in open channel and partially filled conduit applications.
Published: 27/06/2025
Pages: 29
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Introduction
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 Symbols and abbreviated terms
1.5 Evaluation of product conformity
2 Materials
2.1 General
2.2 Resistance to corrosion
2.2.1 General
2.2.2 Corrosion-resistant materials
2.3 Material durability test — Ultraviolet exposure test
3 Principles of measurement
3.1 Methods
3.2 Requirements related to specific technologies
3.3 Metering of open channel conditions
3.4 Velocity area methods
3.5 Flow computation
4 Design
4.1 Output
4.1.1 General
4.1.2 Flow rate
4.1.3 Volume
4.1.4 Other data output
4.2 Electronic data storage
4.3 Sampling rate
4.4 Frost protection
4.5 Bypass
5 Performance requirements
5.1 General
5.2 Rated operating conditions
5.3 Measurement of performance
5.3.1 General
5.3.2 Direct volumetric comparison
5.3.3 Indirect volumetric calculation
6 Product documentation
Appendix A
Appendix B
B.1 General
B.2 Nature of errors
B.3 Simple example of an uncertainty calculation
B.3.1 Background
B.3.2 Characteristics — Gauging structure
B.3.3 Characteristics — Gauged head instrumentation
B.3.4 Discharge coefficient
B.3.5 Discharge estimate
B.3.6 Uncertainty statement
B.3.6.1 Formula B.3.6.1
B.3.6.2 Formula B.3.6.2
B.3.6.3 Formula B.3.6.3
B.3.6.4 Formula B.3.6.4
B.3.7 Conventional statement of discharge
B.3.7.1 Uncertainty budget
Bibliography
Cited references in this standard
Content history
[Superseded]
[Superseded]
[Superseded]
DR AS 4747.3:2024