BS ISO 18320:2020
$198.66
Hydrometry. Measurement of liquid flow in open channels. Determination of the stage-discharge relationship
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 56 |
This document specifies methods of determining the stage–d ischarge relationship for gauging stations. It specifies an accuracy for defining the stage–discharge relationship based on a sufficient number of discharge measurements, complete with corresponding stage measurements.
This document considers stable and unstable channels and includes brief descriptions of the effects on the stage–discharge relationship of the transition from inbank to overbank flows, shifting controls, variable backwater and hysteresis. Methods of determining discharge for twin-gauge stations, ultrasonic velocity-measurement stations and other complex rating curves are not described in detail.
These types of rating curves are described separately in other International Standards, Technical Specifications and Technical Reports, which are listed in the Bibliography.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 7 | Foreword |
| 9 | 1 Scope 2 Normative references 3 Terms, definitions and symbols 3.1 Terms and definitions 3.2 Symbols |
| 10 | 4 Principle of the stage–discharge relationship 4.1 General |
| 11 | 4.2 Controls 4.3 Governing hydraulic formulae |
| 13 | 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 |
| 15 | 5.2.3 Arithmetic plotting scales |
| 16 | 5.2.4 Logarithmic plotting scales |
| 18 | 5.2.5 Commercially available software |
| 19 | 5.2.6 Rating-curve shape |
| 20 | 5.3 Curve fitting 5.3.1 General 5.3.2 Hydraulic-formula curves |
| 21 | 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 |
| 22 | 5.6 Unstable stage–discharge relationships 5.7 Shifting controls |
| 23 | 5.8 Variable-backwater effects 5.8.1 General 5.8.2 Downstream backwater influences 5.8.3 Hysteresis effects or loop rating curves |
| 26 | 5.9 Extrapolation of the stage–discharge relationship 6 Methods of testing stage–discharge relationships |
| 27 | 7 Uncertainty in the stage–discharge relationship 7.1 General 7.2 Definition of uncertainty |
| 28 | 7.3 Statistical analysis of the stage–discharge relationship 7.3.1 General 7.3.2 Standard error of estimate |
| 29 | 7.3.3 Standard uncertainty |
| 30 | 7.4 Uncertainty of predicted discharge |
| 31 | Annex A (informative) Types of control |
| 32 | Annex B (informative) Complexities of stage–discharge relationships |
| 33 | Annex C (informative) Software packages available to evaluate the stage–discharge relationship |
| 37 | Annex D (informative) Examples of a hypothetical rating curve |
| 39 | Annex E (informative) Example of how hydraulic properties of a river channel properties vary with stage |
| 45 | Annex F (informative) Use of shift controls |
| 47 | Annex G (informative) Extrapolation of a stage–discharge relationship |
| 49 | Annex H (informative) Uncertainty in the stage–discharge relationship and in a continuous measurement of discharge |
| 52 | Bibliography |
