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BS EN ISO 748:2021

BS EN ISO 748:2021

$198.66

Hydrometry. Measurement of liquid flow in open channels. Velocity area methods using point velocity measurements

Published By Publication Date Number of Pages
BSI 2021 52
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PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
7 Foreword
9 1 Scope
2 Normative references
3 Terms and definitions
4 Principle of the methods of measurements
10 5 Site selection
5.1 Selection of site
11 5.2 Demarcation of site
6 Measurement of cross-sectional area
6.1 General
6.2 Measurement of width
6.3 Measurement of depth
12 7 Measurement of mean velocity
7.1 Determination of mean velocity using point velocity measurements
7.1.1 General
7.1.2 Measurement procedure
13 7.1.3 Oblique flow
7.1.4 Determination of the mean velocity in a vertical
16 7.1.5 Integration method
7.1.6 Errors and limitations
7.2 Determination of mean velocity from surface velocity
7.2.1 General
17 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
18 8 Computation of discharge
8.1 Arithmetic methods
8.1.1 General
8.1.2 Mean-section method
8.1.3 Mid-section method
19 8.1.4 Bathymetric verticals
8.2 Independent vertical method
21 8.3 Mean-section method — Horizontal planes
9 Uncertainties in flow measurement
9.1 General
22 9.2 Method of calculating the uncertainty in discharge by measurement of velocity by current meter
9.2.1 General
9.2.2 Contributory uncertainties
24 9.3 Method of calculating the uncertainty in discharge by measurement of velocity using floats
9.3.1 General
9.3.2 Contributory uncertainties
25 9.3.3 Combined uncertainty in discharge
26 9.4 Limitations
27 9.5 Interpolated variance estimator (IVE)
9.6 Q+
9.7 Flaure
28 Annex A (informative) Use of point velocity current meters
31 Annex B (informative) Surface velocity measurement using floats
35 Annex C (informative) Example surface velocity systems
37 Annex D (informative) Uncertainties in the velocity-area measurement
40 Annex E (informative) Velocity measurement under ice conditions
46 Annex F (informative) Corrections for wetted length of wire when measuring depths with wire not normal to surface
49 Bibliography

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BS EN ISO 748:2021
$198.66