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BS ISO 18320:2020 Hydrometry. Measurement of liquid flow in open channels. Determination of the stage-discharge relationship >
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BS ISO 18320:2020 Hydrometry. Measurement of liquid flow in open channels. Determination of the stage-discharge relationship, 2020
- undefined
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms, definitions and symbols
- 3.1 Terms and definitions
- 3.2 Symbols
- 4 Principle of the stage–discharge relationship
- 4.1 General
- 4.2 Controls
- 4.3 Governing hydraulic formulae
- 5 Stage–discharge calibration of a gauging station
- 5.1 General
- 5.2 Preparation of a stage–discharge relationship
- 5.2.1 General
- 5.2.2 List of discharge measurements
- 5.2.3 Arithmetic plotting scales
- 5.2.4 Logarithmic plotting scales
- 5.2.5 Commercially available software
- 5.2.6 Rating-curve shape
- 5.3 Curve fitting
- 5.3.1 General
- 5.3.2 Hydraulic-formula curves
- 5.3.3 Mathematical rating curves
- 5.3.4 Software packages to aid the determination of the rating curve
- 5.4 Combination-control stage–discharge relationships
- 5.5 Stable stage–discharge relationships
- 5.6 Unstable stage–discharge relationships
- 5.7 Shifting controls
- 5.8 Variable-backwater effects
- 5.8.1 General
- 5.8.2 Downstream backwater influences
- 5.8.3 Hysteresis effects or loop rating curves
- 5.9 Extrapolation of the stage–discharge relationship
- 6 Methods of testing stage–discharge relationships
- 7 Uncertainty in the stage–discharge relationship
- 7.1 General
- 7.2 Definition of uncertainty
- 7.3 Statistical analysis of the stage–discharge relationship
- 7.3.1 General
- 7.3.2 Standard error of estimate
- 7.3.3 Standard uncertainty
- 7.4 Uncertainty of predicted discharge
- Annex A (informative) Types of control
- Annex B (informative) Complexities of stage–discharge relationships
- Annex C (informative) Software packages available to evaluate the stage–discharge relationship
- Annex D (informative) Examples of a hypothetical rating curve
- Annex E (informative) Example of how hydraulic properties of a river channel properties vary with stage
- Annex F (informative) Use of shift controls
- Annex G (informative) Extrapolation of a stage–discharge relationship
- Annex H (informative) Uncertainty in the stage–discharge relationship and in a continuous measurement of discharge
- Bibliography [Go to Page]