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AS
AS 3778.4.2-1991

AS 3778.4.2-1991

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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Measurement of water flow in open channels Part 4: Measurement using flow gauging structures Rectangular broad-crested weirs

Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Superseded date

09-06-2022

Superseded by

AS 3778.4.2:2022

Language(s)

English

Published date

23-09-1991

Publisher

Standards Australia

Preview
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Hardcopy - English
PDF 1 User - English
PDF 3 Users - English
PDF 5 Users - English
PDF 9 Users - English
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1 - AS 3778.4.2-1991 MEASUREMENT OF WATER FLOW IN OPEN CHANNELS - MEASUREMENT USING FLOW GAUGING STRUCTURES - RECTANGULAR BROAD-C
4 - PREFACE
6 - 1 Scope and field of application
6 - 2 References
6 - 3 Definitions
6 - 4 Installation
6 - 4.1 Selection of site
7 - 4.2 Installation conditions
7 - 4.2.1 General requirements
7 - 4.2.2 The approach channel
7 - 4.2.3 The measuring structure
7 - 4.2.4 Downstream of the structure
8 - 5 Maintenance - General requirements
8 - 6 Measurement of head(s)
8 - 6.1 General requirements
8 - 6.2 Stilling or float well
8 - 6.3 Zero setting
8 - 7 Rectangular broad-crested weirs
8 - 7.1 Specification for the standard weir
8 - 7.2 Location of the head gauge section
9 - 7.3 Provision for modular flow
9 - 8 Discharge relationships
9 - 8.1 Discharge equation
9 - 8.2 Discharge coefficient
11 - 8.3 Limitations
11 - 8.4 Accuracy
11 - 9 Uncertainties in flow measurement
11 - 9.1 General
12 - 9.2 Sources of error
12 - 9.3 Types of error
12 - 9.4 Uncertainties in coefficient values
12 - 9.5 Uncertainties in measurements made by the user
13 - 9.6 Combination of uncertainties
13 - 9.7 Presentation of results
13 - 10 Example
15 - Annex A - Nomenclature
16 - Annex B - Submerged flow
17 - Annex C - Gauged head discharge coefficient and total head discharge coefficient

Specifies the requirements for the use of rectangular broad-crested weirs for the measurement of water flow in open channels under free flow conditions. It is technically identical with and reproduced from ISO 3846:1989.

Committee
CE-024
DocumentType
Standard
ISBN
0 7262 7060 1
Pages
12
PublisherName
Standards Australia
Status
Superseded
SupersededBy

This International Standard lays downrequirements for the use of rectangular broad-crested weirs for the measurement of flow of clear water in open channels under free flow conditions.Annexes A, B and C form an integral part of this International Standard.

Standards Relationship
ISO 3846:1989 Identical

First published as AS 3778.4.2-1991.

AS 3778.2.4-2007 Measurement of water flow in open channels General - Estimation of uncertainty of a flow rate measurement (Reconfirmed 2022)
AS 3778.3.1-1990 Measurement of water flow in open channels Velocity-area methods - Measurement by current-meters and floats
AS 3778.2.2-1990 Measurement of water flow in open channels General - Establishment and operation of a gauging station
AS 3778.2.5-1991 Measurement of water flow in open channels General - Guidelines for the selection of flow gauging structures
AS 3778.1-1990 Measurement of water flow in open channels Vocabulary and symbols
AS 3778.2.5-2001 Measurement of water flow in open channels General - Guidelines for the selection of flow-gauging structures
AS 3778.1-2001 Measurement of water flow in open channels Vocabulary and symbols
AS 3778.2.4-1990 Measurement of water flow in open channels General - Estimation of uncertainty of a flow-rate measurement
AS 3778.3.1-2001 Measurement of water flow in open channels Velocity-area methods - Measurement by current-meters and floats
AS 3778.2.2-2001 Measurement of water flow in open channels General - Establishment and operation of a gauging station

AS 3778.2.5-2001 Measurement of water flow in open channels General - Guidelines for the selection of flow-gauging structures
AS 3778.7-2008 Measurement of water flow in open channels Determination of volume of water and water level in lakes and reservoirs
AS 3778.2.5-1991 Measurement of water flow in open channels General - Guidelines for the selection of flow gauging structures
ATS 4747.6-2008 Meters for non-urban water supply Installation and commissioning of open channel meters
ATS 4747.3-2008 Meters for non-urban water supply Specifications for open channel meters
AS 3778.4.11-1991 Measurement of water flow in open channels - Measurement using flow gauging structures End-depth method for estimation of flow in non-rectangular channels with a free overfall (approximate method) (Reconfirmed 2009)

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