BS ISO 9123:2017
Current
The latest, up-to-date edition.
Hydrometry. Stage-fall-discharge relationships
Hardcopy , PDF
English
07-11-2017
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 General considerations
6 Unit-fall method
7 Constant-fall method
8 Variable-fall method
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
Annex A (informative) - Multiple least squares
regression - Matrix representation
Bibliography
Describes methods for determining stage-fall-discharge relationships for a stream reach where variable backwater occurs either intermittently or continuously.
| Committee |
CPI/113
|
| DevelopmentNote |
Supersedes 97/122232 DC. (02/2002) Supersedes 16/30319087 DC. (11/2017)
|
| DocumentType |
Standard
|
| Pages |
40
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
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 ISO1100‑2 .
| Standards | Relationship |
| ISO 9123:2017 | Identical |
| ISO 5168:2005 | Measurement of fluid flow — Procedures for the evaluation of uncertainties |
| ISO 1100-2:2010 | Hydrometry Measurement of liquid flow in open channels Part 2: Determination of the stage-discharge relationship |
| ISO 1088:2007 | Hydrometry Velocity-area methods using current-meters Collection and processing of data for determination of uncertainties in flow measurement |
| ISO/TS 25377:2007 | Hydrometric uncertainty guidance (HUG) |
| ISO 772:1996 | Hydrometric determinations — Vocabulary and symbols |
| ISO/IEC Guide 98-3:2008 | Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) |
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