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eLibrary > BS ISO 4377:2012 Hydrometric determinations. Flow measurement in open channels using structures. Flat-V weirs >

BS ISO 4377:2012 Hydrometric determinations. Flow measurement in open channels using structures. Flat-V weirs, 2012

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BS ISO 4377:2012 Hydrometric determinations. Flow measurement in open channels using structures. Flat-V weirs, 2012

1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Characteristics of flat-V weirs
6 Installation [Go to Page]
6.1 Selection of site
6.2 Installation conditions [Go to Page]
6.2.1 General requirements
6.2.2 Approach channel
6.3 Weir structure
6.4 Downstream conditions
7 Maintenance
8 Measurement of head(s) [Go to Page]
8.1 General
8.2 Stilling (gauge) wells
8.3 Zero setting
8.4 Location of head measurement sections
9 Discharge relationships [Go to Page]
9.1 Equations of discharge
9.2 Effective heads
9.3 Shape factors
9.4 Coefficient of velocity
9.5 Conditions for modular/drowned flow
9.6 Drowned flow reduction factor
9.7 Limits of application
10 Computation of discharge [Go to Page]
10.1 General
10.2 Successive approximation method [Go to Page]
10.2.1 Computation using individual head measurements
10.2.2 Computation of modular stage-discharge function
10.3 Coefficient of velocity method [Go to Page]
10.3.1 Modular flow conditions
10.3.2 Drowned flow conditions
10.4 Accuracy
11 Uncertainties in flow determination [Go to Page]
11.1 General
11.2 Combining uncertainties
11.3 Uncertainty in the discharge coefficient u*(CDe)68 for the flat-V weir
11.4 Uncertainty in the drowned flow reduction factor u*(Cdr)
11.5 Uncertainty in the effective head
11.6 Uncertainty budget
11.7 Variation of uncertainty with flow and uncertainty in mean daily flow and the daily flow volume [Go to Page]
11.7.1 Uncertainty curve
11.7.2 Uncertainty in the daily mean flow
11.7.3 Uncertainty in the daily flow volume
12 Examples [Go to Page]
12.1 Example 1 — Computation of modular flow at low discharge [Go to Page]
12.1.1 Data
12.1.2 Solution by successive approximation method (see 10.2)
12.1.3 Solution by coefficient of velocity method (see 10.3)
12.2 Example 1 — Uncertainty in computed discharge [Go to Page]
12.2.1 Uncertainty in the discharge coefficient
12.2.2 Uncertainty in drowned flow reduction factor
12.2.3 Uncertainty in the horizontal; component of the weir crest gradient
12.2.4 Uncertainty in the effective total head
12.2.5 Overall uncertainty
12.3 Example 2 — Computation of drowned flow at high discharge [Go to Page]
12.3.1 Data
12.3.2 Solution using successive approximation method (see 10.2)
12.3.3 Solution using the coefficient of velocity method (see 10.3)
12.4 Example 2 — Uncertainty in computed discharge [Go to Page]
12.4.1 Uncertainty in the discharge coefficient
12.4.2 Uncertainty in the horizontal; component of the weir crest gradient
12.4.3 Uncertainty in the effective total head
12.4.4 Uncertainty in the separation pocket (crest tapping) head
12.4.5 Uncertainty in drowned flow reduction factor
12.4.6 Overall uncertainty for non-modular flow example [Go to Page]

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BS ISO 4377:2012 Hydrometric determinations. Flow measurement in open channels using structures. Flat-V weirs, 2012

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