1 - AS 3778.2.3-2001 MEASUREMENT OF WATER FLOW IN OPEN CHANNELS - GENERAL-DETERMINATION OF THE STAGE-DISCHARGE RELATIONSHIP
4 - PREFACE
6 - CONTENTS
7 - 1 Scope
7 - 2 Normative references
8 - 3 Definitions and symbols
8 - 4 Units of measurement
8 - 5 Principle of the stage-discharge relation
9 - 5.1 Controls
9 - 5.1.1 General
9 - 5.2 Governing hydraulic equations
10 - 5.3 Complexities of stage-discharge relations
11 - 6 Stage-discharge calibration of a gauging station
11 - 6.1 General
11 - 6.2 General preparation of a stage-discharge relation
11 - 6.2.1 General
11 - 6.2.2 List of discharge measurements
12 - 6.2.3 Arithmetic plotting scales
12 - 6.2.4 Logarithmic plotting scales
16 - 6.3 Curve fitting
16 - 6.3.1 General
16 - 6.3.2 Graphical curves
16 - 6.3.3 Hydraulic equation curves
17 - 6.3.4 Mathematical rating curves
17 - 6.4 Combination control stage-discharge relations
17 - 6.5 Stable stage-discharge relations
18 - 6.6 Unstable stage-discharge relations
18 - 6.7 Shifting controls
19 - 6.8 Variable backwater effects
19 - 6.8.1 General
19 - 6.8.2 Downstream backwater influences
20 - 6.8.3 Ice effects
21 - 6.8.4 Hysteresis effect, or loop ratings
22 - 6.8.5 Tidal discharge measurements - Loop ratings
22 - 6.9 Extrapolation of the stage-discharge relation
23 - 6.10 Rating tables
24 - 7 Methods of testing stage-discharge relations
24 - 8 Uncertainty in the stage-discharge relation
24 - 8.1 General
24 - 8.2 Example of uncertainty calculations for individual gaugings
27 - 8.3 Example of calculating the uncertainty of the daily mean discharge
28 - Annex A - Uncertainty in stage-discharge relation and in continuous measurement of discharge
28 - A.1 General
28 - A.2 Statistical analysis of the stage-discharge relation
29 - A.3 Uncertainty in the daily mean discharge
29 - A.4 Uncertainty in the monthly and annual mean discharges
30 - A.5 Uncertainty in the measured stage
31 - Annex B - Bibliography
32 - TECHNICAL CORRIGENDUM 1