BS ISO 9123:2017
$167.15
Hydrometry. Stage-fall-discharge relationships
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 38 |
This document specifies methods for determining stage-fall-discharge relationships for a stream reach where variable backwater occurs either intermittently or continuously. Two gauging stations, a base reference gauge and an auxiliary gauge are required for gauge height measurements. A number of discharge measurements are required in order to calibrate the rating to the accuracy required by this document.
The preparation of rating curves is not described in detail in this document.
NOTE For a more detailed description of preparing rating curves, see the methods described in ISO 1100‑2 .
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 7 | Foreword |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols and abbreviated terms 4.1 Symbols |
| 10 | 4.2 Abbreviations |
| 11 | 5 General considerations 5.1 Importance of backwater 5.2 Backwater conditions 5.3 Gauging requirements |
| 12 | 5.4 Types of stage-fall-discharge relationships 6 Unit-fall method 6.1 General |
| 13 | 6.2 Method of analysis 6.3 Computation of discharge 6.4 Example of unit-fall method |
| 15 | 7 Constant-fall method 7.1 General 7.2 Method of analysis 7.3 Computation of discharge 7.4 Example of constant-fall method |
| 18 | 8 Variable-fall method 8.1 General |
| 19 | 8.2 Normal-fall method 8.3 Limiting-fall method 8.3.1 General 8.3.2 Method of analysis 8.3.3 Computation of discharge |
| 20 | 8.3.4 Example of limiting-fall method |
| 24 | 9 Rating curves and tables 10 Method of computation 11 Periodic checking of stage-fall-discharge ratings 12 Extrapolations 13 Evaluation of uncertainty in the stage-fall-discharge relation 13.1 General |
| 25 | 13.2 Implementing the GUM procedure for evaluating uncertainty in the stage-fall-discharge relation and derived estimates 13.2.1 General 13.2.2 Propagation of uncertainty for stage-fall-discharge estimates |
| 26 | 13.2.3 Uncertainty in rating curve |
| 29 | 13.2.4 Uncertainty in the measured stage 13.2.5 Uncertainty in the measured fall 13.2.6 Prediction intervals of estimated discharge 13.2.7 Uncertainty caused by neglecting all other physical parameters |
| 30 | 13.3 Example 13.3.1 General |
| 31 | 13.3.2 Standard error of estimate 13.3.3 Uncertainty of mean response |
| 32 | 13.3.4 Uncertainty in measured stage and fall 13.3.5 Uncertainty caused by neglecting all other physical parameters 13.3.6 Propagation of uncertainty in discharge estimation |
| 33 | 13.3.7 Uncertainty in the predicted discharge |
| 35 | Annex A (informative) Multiple least squares regression — Matrix representation |
| 37 | Bibliography |
