We noticed you’re not on the correct regional site. Switch to our AMERICAS site for the best experience.
  • DIN EN ISO 748 E : 2008

    Current The latest, up-to-date edition.
    Add to Watchlist
    This Standard has been added successfully to your Watchlist.
    Please visit My Watchlist to see all standards that you are watching.
    Please log in or to add this standard to your Watchlist.
    We could not add this standard to your Watchlist.
    Please retry or contact support for assistance.
    You need to be logged in to add this standard to your Watchlist.
    Please log in now or create an account to add.
    You already added this Product in the Watchlist.

    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

    Publisher:  German Institute for Standardisation (Deutsches Institut für Normung)

    Add to Watchlist

    Add To Cart

    Table of Contents - (Show below) - (Hide below)

    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

    Abstract - (Show below) - (Hide below)

    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.

    General Product Information - (Show below) - (Hide below)

    Development Note The 2020 draft version has released for the standard DIN EN ISO 748
    Document Type Standard
    Publisher German Institute for Standardisation (Deutsches Institut für Normung)
    Status Current
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    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

    Standards Referencing This Book - (Show below) - (Hide below)

    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
    • Access your standards online with a subscription

      Features

      • Simple online access to standards, technical information and regulations
      • Critical updates of standards and customisable alerts and notifications
      • Multi - user online standards collection: secure, flexibile and cost effective