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BS ISO 1438:2017

BS ISO 1438:2017

$215.11

Hydrometry. Open channel flow measurement using thin-plate weirs

Published By Publication Date Number of Pages
BSI 2017 72
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PDF Catalog

PDF Pages PDF Title
2 undefined
7 Foreword
9 1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
10 5 Principle
6 Installation
6.1 General
6.2 Selection of site
6.3 Installation conditions
6.3.1 General
11 6.3.2 Weir
6.3.3 Approach channel
12 6.3.4 Downstream channel
7 Measurement of head
7.1 Head-measuring devices
13 7.2 Stilling or float well
7.3 Head-measurement section
7.3.1 Upstream head-measurement
7.3.2 Downstream head measurement
7.4 Head-gauge datum (gauge zero)
14 8 Maintenance
9 Rectangular thin-plate weir
9.1 Types
16 9.2 Specifications for the standard weir
9.3 Specifications for installation
9.4 Determination of gauge zero
19 9.5 Discharge formulae — General
9.6 Formulae for the basic weir form (all values of b/B)
9.6.1 Kindsvater-Carter formula
9.6.2 Evaluation of Cd, kb and kh
21 9.6.3 Formulae for Cd
22 9.6.4 Practical limitations on h/p, h, b and p
9.7 Formulae for full-width weirs (b/B = 1,0)
9.7.1 Modular flow discharge formula
23 9.7.2 Non-modular flow discharge formula
24 10 Triangular-notch thin-plate weir
10.1 Specifications for the standard weir
27 10.2 Specifications for the installation
10.3 Specifications for head measurement
10.3.1 General
10.3.2 Determination of notch angle
10.3.3 Determination of gauge zero
28 10.4 Discharge formulae — General
10.5 Formula for all notch angles between π/9 and 5 π/9 radians (20° and 100°)
10.5.1 Kindsvater-Shen formula
10.5.2 Evaluation of Cd and kh
30 10.5.3 Practical limitations on α, h/p, p/B, h and p
10.6 Formula for specific notch angles (fully-contracted weir)
31 10.7 Accuracy of discharge coefficients — Triangular-notch weirs
11 Uncertainties of flow measurement
11.1 General
32 11.2 Combining measurement uncertainties
33 11.3 Uncertainty of discharge coefficient, u*(Cd), for thin-plate weirs
34 11.4 Uncertainty budget
12 Example
12.1 General
12.2 Characteristics — Gauging structure
35 12.3 Characteristics — Gauged head instrumentation
12.4 Discharge coefficient
12.5 Discharge estimate
12.6 Uncertainty statement
38 Annex A (informative) Flow measurement with small weir tanks
40 Annex B (normative) Guide to the design and installation of a flow straightener
42 Annex C (informative) Introduction to measurement uncertainty
50 Annex D (informative) Sample measurement performance for use in hydrometric worked examples
53 Annex E (informative) Specimen tables
68 Bibliography

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BS ISO 1438:2017
$215.11