ISO 9123:2001 PDF

Scope: This International Standard 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 ate re-quired in order to calibrate the rating to the accuracy required by this International Standard. The preparation of rating curves is not described in detail in this International Standard. NOTE For a more detailed description of preparing rating curves, see the methods described in ISO 1100-2

ISO 9123:2001 Referenced Document

ISO 1000 SI units and recommendations for the use of their multiples and of certain other units; Amendment 1
ISO 1100-2 Hydrometry - Measurement of liquid flow in open channels - Part 2: Determination of the stage-discharge relationship*， 2010-12-01 Update
ISO 772 Hydrometry — Vocabulary and symbols*， 2022-02-28 Update

2017 ISO 9123:2017 Hydrometry - Stage-fall-discharge relationships
2001 ISO 9123:2001 Measurement of liquid flow in open channels - Stage-fall-discharge relationships
1986 ISO 9123:1986 Liquid flow measurements in open channels; Stage-fall-discharge relations