Table of Contents

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

Abstract

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.

Scope

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.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
Pages
ISBN
Committee	CE-024