BS EN ISO 748:2007

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle of the methods of measurements
5 Selection and demarcation of site
6 Measurement of cross-sectional area
7 Measurement of velocity
8 Computation of discharge
9 Uncertainties in flow measurement
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

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.

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

It covers methods of employing current-meters or floats to measure the velocities. It should be noted that although, in some cases, these measurements are intended to determine the stage-discharge relation of a gauging station, this International Standard deals only with single measurements of the discharge; the continuous recording of discharges over a period of time is covered in ISO1100-1 and ISO1100-2.

NOTE The methods for determining the velocity and cross-sectional area of water flowing in open channels with ice cover are specified in ISO9196.