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DIN EN ISO 748 E : 2008

Current
Current

The latest, up-to-date edition.

HYDROMETRY - MEASUREMENT OF LIQUID FLOW IN OPEN CHANNELS USING CURRENT-METERS OR FLOATS
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

01-01-2008

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle of the methods of measurements
5 Selection and demarcation of site
  5.1 Selection of site
  5.2 Demarcation of site
6 Measurement of cross-sectional area
  6.1 General
  6.2 Measurement of width
  6.3 Measurement of depth
7 Measurement of velocity
  7.1 Measurement of velocity using current-meters
      7.1.1 Rotating-element current-meters
      7.1.2 Electromagnetic current-meters
      7.1.3 Measurement procedure
      7.1.4 Oblique flow
      7.1.5 Determination of the mean velocity in a vertical
      7.1.6 Errors and limitations
  7.2 Measurement of velocity using floats
      7.2.1 General
      7.2.2 Selection of site
      7.2.3 Measuring procedure
      7.2.4 Types of float
      7.2.5 Determination of velocity
      7.2.6 Main sources of error
8 Computation of discharge
  8.1 General
  8.2 Graphical method
      8.2.1 Depth-velocity-integration
      8.2.2 Velocity-area Integration method
            (velocity-contour method)
  8.3 Arithmetic methods
      8.3.1 Mean-section method
      8.3.2 Mid-section method
  8.4 Independent vertical method
  8.5 Mean-section method - Horizontal planes
  8.6 Determination of discharge from surface-float
      velocity measurements
  8.7 Determination of discharge for variations of
      water level
      8.7.1 General
      8.7.2 Computation of discharge
      8.7.3 Computation of mean water level
9 Uncertainties in flow measurement
  9.1 General
  9.2 Definition of uncertainty
  9.3 Method of calculating the uncertainty in
      discharge by measurement of velocity by
      current-meter
      9.3.1 General
      9.3.2 Contributory uncertainties
      9.3.3 Example
      9.3.4 Combined uncertainty
  9.4 Method of calculating the uncertainty in discharge
      by measurement of velocity using floats
      9.4.1 General
      9.4.2 Contributory uncertainties
      9.4.3 Combined uncertainty in discharge
      9.4.4 Example
Annex A (informative) Correction for sag, pull, slope and
        temperature in measurement of cross-section
        width by tape or wire
Annex B (informative) Distance measurement across the
        cross-section
Annex C (informative) Corrections for wetted length of wire
        when measuring depths with wire not
        normal to surface
Annex D (informative) Correction for drift
Annex E (informative) Uncertainties in the velocity-
        area measurement
Annex F (informative) Determination of mean velocity
        from float measurements
Bibliography
National Annex NA (informative) Bibliography

Describes methods for determining the velocity and cross-sectional area of water flowing in open channels without ice cover, and for computing the discharge therefrom.

DevelopmentNote
The 2020 draft version has released for the standard DIN EN ISO 748
DocumentType
Standard
Pages
52
PublisherName
German Institute for Standardisation (Deutsches Institut für Normung)
Status
Current
Supersedes

Standards Relationship
ONORM EN ISO 748 : 2008 Identical
NEN EN ISO 748 : 2007 Identical
EN ISO 748:2007 Identical
SN EN ISO 748:2007 Identical
I.S. EN ISO 748:2007 Identical
UNE-EN ISO 748:2009 Identical
NF EN ISO 748 : 2009 Identical
ISO 748:2007 Identical
NBN EN ISO 748 : 2007 Identical
UNI EN ISO 748 : 2008 Identical
NS EN ISO 748 : 2ED 2007 Identical
BS EN ISO 748:2007 Identical

DIN EN ISO 18365 E : 2014 HYDROMETRY - SELECTION, ESTABLISHMENT AND OPERATION OF A GAUGING STATION (ISO 18365:2013)
DIN EN ISO 6416:2005-11 HYDROMETRY - MEASUREMENT OF DISCHARGE BY THE ULTRASONIC (ACOUSTIC) METHOD

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 4373:2008 Hydrometry Water level measuring devices
ISO 3454:2008 Hydrometry — Direct depth sounding and suspension equipment
ISO 4369:1979 Measurement of liquid flow in open channels Moving-boat method
ISO/TS 15768:2000 Measurement of liquid velocity in open channels Design, selection and use of electromagnetic current meters
ISO 4366:2007 Hydrometry — Echo sounders for water depth measurements
ISO 1088:2007 Hydrometry Velocity-area methods using current-meters Collection and processing of data for determination of uncertainties in flow measurement
ISO/TR 9209:1989 Measurement of liquid flow in open channels Determination of the wetline correction
ISO 1100-1:1996 Measurement of liquid flow in open channels Part 1: Establishment and operation of a gauging station
ISO 4375:2014 Hydrometry Cableway systems for stream gauging
ISO 2537:2007 Hydrometry — Rotating-element current-meters
DIN EN ISO 772:2011-11 Hydrometry - Vocabulary and symbols (ISO 772:2011); Trilingual version EN ISO 772:2011
ISO 9196:1992 Liquid flow measurement in open channels — Flow measurements under ice conditions
ISO 772:1996 Hydrometric determinations — Vocabulary and symbols
ISO 3455:2007 Hydrometry Calibration of current-meters in straight open tanks

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