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AS 3778.3.3-2001
$87.96
Measurement of water flow in open channels, Part 3.3: Velocity-area methods — Measurement by slope-area method
This Standard is identical to and has been reproduced from ISO 1070:1992.
Table of contents
Header
About this publication
Preface
1 Scope
2 Normative references
3 Definitions
4 Principle of the method of measurement
5 Selection and demarcation of site
5.1 Initial survey of site
5.2 Selection of site
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.2.7
5.2.8
5.2.9
5.3 Demarcation of site
6 Devices for measurement of slope
6.1 Reference gauge
6.2 Water-level recorder
6.3 Crest stage gauge
6.4 High-water marks
7 Procedure for installing gauges and making observations
7.1 Installation
7.2 Procedure for observation of gauges
7.3 Other observations
8 Computation of surface slope
8.1 Computation of surface slope from gauges
8.2 Computation of surface slope from high-water marks
9 Cross-sections of the stream
9.1 Number of cross-sections
9.2 Measurement of cross-sectional profiles
10 Computation of discharge for non-uniform and composite cross-sections
10.1 Computation of conveyance
10.1.1 Non-uniform section
10.1.2 Composite section
10.2 Computation of the hydraulic radius
10.3 Value of Manning’s coefficient
10.4 Evaluation of the friction slope
10.5 Computation of discharge using three or more cross-sections
10.6 State of flow
11 Computation of discharge for uniform cross-sections
11.1 Determination of the mean cross-sectional area and the mean wetted perimeter of the reach
11.2 Determination of the mean velocity in the reach
11.2.1 Using Manning’s equation
11.2.2 Using Chezy’s equation
11.3 Correction of discharge
12 Uncertainties in flow measurement
12.1 Errors
12.2 Methods of calculation
12.2.1 Sources of uncertainties for a uniform reach
12.2.2 Determination of individual components of uncertainty in the discharge calculation
12.2.2.1 Uncertainty in the calculation of the mean cross-sectional area
12.2.2.2 Uncertainty in the calculation of the mean wetted perimeter
12.2.2.3 Relationship between the uncertainties in the cross-sectional area and in the wetted perimeter
12.2.2.4 Uncertainties in determination of the friction slope
12.2.2.5 Uncertainty due to choice of the rugosity coefficient
12.2.3 Overall uncertainty in the measurement of discharge
Annex A
Annex B
Amendment 1
Cited references in this standard
Content history
[Current]
[Superseded]
[Superseded]
DR 99551
ISO 1070:1992/Amd.1:1997
Please select a variation to view its description.
| Published | 12/03/2001 |
|---|---|
| Pages | 12 |
Please select a variation to view its pdf.
