Designation:D5089−95(Reapproved2014)StandardTestMethodforVelocityMeasurementsofWaterinOpenChannelswithElectromagneticCurrentMeters1ThisstandardisissuedunderthefixeddesignationD5089;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheuseofsingle-axisordual-axiselectromagneticcurrentmetersforthemeasurementofwatervelocitiesinopenchannels.1.2Thistestmethodcoversonlythesecomponentsandappurtenancesofportableopen-channelcurrent-metersystems,whicharecustomarilyrequiredwhenanoperatorisinatten-dance.1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD2777PracticeforDeterminationofPrecisionandBiasofApplicableTestMethodsofCommitteeD19onWaterD3858TestMethodforOpen-ChannelFlowMeasurementofWaterbyVelocity-AreaMethodD4409TestMethodforVelocityMeasurementsofWaterinOpenChannelswithRotatingElementCurrentMeters2.2ISOStandards:3ISO3454LiquidFlowMeasurementinOpenChannels—SoundingandSuspensionEquipmentISO3455LiquidFlowMeasurementinOpenChannels—CalibrationofRotatingElementCurrentMetersinStraightOpenTanks3.Terminology3.1Definitions—FordefinitionsoftermsusedinthistestmethodrefertoTerminologyD1129.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1boundarylayer—arelativelythinlayerofviscousinfluenceadjacenttotheprobe(oranysolid)surfacecausedbytherequirementthatthewatervelocitymustbezeroatthewall.3.2.2cosineresponse—t...
