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1 Scope 7 2 Normative references 7 3 Terms and definitions 8 4 Symbols 9 5 Characteristics of flat-V weirs 10 6 Installation 10 6.1 Selection of site 10 6.2 Installation conditions 13 6.2.1 General requirements 13 6.2.2 Approach channel 13 6.3 Weir structure 14 6.4 Downstream conditions 14 7 Maintenance 14 8 Measurement of head(s) 15 8.1 General 15 8.2 Stilling (gauge) wells 15 8.3 Zero setting 17 8.4 Location of head measurement sections 19 9 Discharge relationships 20 9.1 Equations of discharge 20 9.2 Effective heads 21 9.3 Shape factors 22 9.4 Coefficient of velocity 22 9.5 Conditions for modular/drowned flow 24 9.6 Drowned flow reduction factor 27 9.7 Limits of application 34 10 Computation of discharge 35 10.1 General 35 10.2 Successive approximation method 35 10.2.1 Computation using individual head measurements 35 10.2.2 Computation of modular stage-discharge function 36 10.3 Coefficient of velocity method 37 10.3.1 Modular flow conditions 37 10.3.2 Drowned flow conditions 37 10.4 Accuracy 38 11 Uncertainties in flow determination 38 11.1 General 38 11.2 Combining uncertainties 39 11.3 Uncertainty in the discharge coefficient u*(CDe)68 for the flat-V weir 40 11.4 Uncertainty

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Author

DE LERBER Danielle

Language

EN

Category

reference