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eLibrary > BS EN ISO 748:2021 Hydrometry. Measurement of liquid flow in open channels. Velocity area methods using point velocity measurements >

BS EN ISO 748:2021 Hydrometry. Measurement of liquid flow in open channels. Velocity area methods using point velocity measurements, 2021

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BS EN ISO 748:2021 Hydrometry. Measurement of liquid flow in open channels. Velocity area methods using point velocity measurements, 2021

undefined
European foreword
Endorsement notice [Go to Page]
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle of the methods of measurements
5 Site selection [Go to Page]
5.1 Selection of site
5.2 Demarcation of site
6 Measurement of cross-sectional area [Go to Page]
6.1 General
6.2 Measurement of width
6.3 Measurement of depth
7 Measurement of mean velocity [Go to Page]
7.1 Determination of mean velocity using point velocity measurements [Go to Page]
7.1.1 General
7.1.2 Measurement procedure
7.1.3 Oblique flow
7.1.4 Determination of the mean velocity in a vertical
7.1.5 Integration method
7.1.6 Errors and limitations
7.2 Determination of mean velocity from surface velocity [Go to Page]
7.2.1 General
7.2.2 Non-contact systems
7.2.3 Surface one-point method by current meter
7.2.4 Measurement of velocity using floats
7.2.5 Exceptions
7.2.6 Main sources of error
8 Computation of discharge [Go to Page]
8.1 Arithmetic methods [Go to Page]
8.1.1 General
8.1.2 Mean-section method
8.1.3 Mid-section method
8.1.4 Bathymetric verticals
8.2 Independent vertical method
8.3 Mean-section method — Horizontal planes
9 Uncertainties in flow measurement [Go to Page]
9.1 General
9.2 Method of calculating the uncertainty in discharge by measurement of velocity by current meter [Go to Page]
9.2.1 General
9.2.2 Contributory uncertainties
9.3 Method of calculating the uncertainty in discharge by measurement of velocity using floats [Go to Page]
9.3.1 General
9.3.2 Contributory uncertainties
9.3.3 Combined uncertainty in discharge
9.4 Limitations
9.5 Interpolated variance estimator (IVE)
9.6 Q+
9.7 Flaure
Annex A (informative) Use of point velocity current meters
Annex B (informative) Surface velocity measurement using floats
Annex C (informative) Example surface velocity systems
Annex D (informative) Uncertainties in the velocity-area measurement
Annex E (informative) Velocity measurement under ice conditions
Annex F (informative) Corrections for wetted length of wire when measuring depths with wire not normal to surface
Bibliography [Go to Page]

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BS EN ISO 748:2021 Hydrometry. Measurement of liquid flow in open channels. Velocity area methods using point velocity measurements, 2021

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