ForewordScopeNormative referencesTerms and definitionsSymbols and abbreviated termsPrincipleInstallationGeneralSelection of siteInstallation conditionsGeneralWeirApproach channelDownstream channelMeasurement of headHead-measuring devicesStilling or float wellHead-measurement sectionUpstream head-measurementDownstream head measurementHead-gauge datum (gauge zero)MaintenanceRectangular thin-plate weirTypesSpecifications for the standard weirSpecifications for installationDetermination of gauge zeroDischarge formulae — GeneralFormulae for the basic weir form (all values of )Kindsvater-Carter formulaEvaluation of and Formulae for Practical limitations on and Formulae for full-width weirs Modular flow discharge formulaNon-modular flow discharge formulaTriangular-notch thin-plate weirSpecifications for the standard weirSpecifications for the installationSpecifications for head measurementGeneralDetermination of notch angleDetermination of gauge zeroDischarge formulae — GeneralFormula for all notch angles between π/9 and 5 π/9 radians (20° and 100°)Kindsvater-Shen formulaEvaluation of and Practical limitations on and Formula for specific notch angles (fully-contracted weir)Accuracy of discharge coefficients — Triangular-notch weirsUncertainties of flow measurementGeneralCombining measurement uncertaintiesUncertainty of discharge coefficient, , for thin-plate weirsUncertainty budgetExampleGeneralCharacteristics — Gauging structureCharacteristics — Gauged head instrumentationDischarge coefficientDischarge estimateUncertainty statementFlow measurement with small weir tanksGuide to the design and installation of a flow straightenerIntroduction to measurement uncertaintyGeneralConfidence limits and coverage factorsRandom and systematic errorMeasurement standardsEvaluation of Type-A uncertaintyEvaluation of Type-B uncertaintyGeneralThe triangular distributionThe rectangular distributionThe normal probability distributionBimodal probability distributionCombined uncertainty valueSample measurement performance for use in hydrometric worked examplesSpecimen tables