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BS ISO 9123:2017

Current
Current

The latest, up-to-date edition.

Hydrometry. Stage-fall-discharge relationships
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

07-11-2017

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.

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 .

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

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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