Designation:D5716/D5716M−20StandardTestMethodforMeasuringtheRateofWellDischargebyCircularOrificeWeir1ThisstandardisissuedunderthefixeddesignationD5716/D5716M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversconstructionandoperationofacircularorificeweirformeasuringthedischargefromawell.Thistestmethodisapartofaseriesofstandardspreparedontheinsitudeterminationofhydraulicpropertiesofaquifersystemsbysingle-ormultiple-welltests.SelectionofawelldischargemeasurementtestmethodisdescribedinGuideD5737M.1.2Thedischargeratedeterminedbythistestmethodiscommonlyusedforanumberofaquifertestmethodsandtoprovideinformationfortheevaluationofwellandpumpperformance.1.3Limitations—Thistestmethodislimitedtothedescrip-tionofamethodcommontohydraulicengineeringforthepurposeofgroundwaterdischargemeasurementintemporaryortestconditions.1.4MuchoftheinformationpresentedinthistestmethodisbasedonworkperformedbytheCivilEngineeringDepartmentofPurdueUniversityduringthelate1940s.TheessentialsofthatworkhavebeenpresentedinapamphletpreparedbyLayne-Bowler,Inc.2andupdatedbyLayneWesternCompany,Inc.31.5AllobservedandcalculatedvaluesshallbeconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.5.1Theproceduresusedtospecifyhowdataarecollected/recordedandcalculatedinthisstandardareregardedastheindustrystandard.Inadditiontheyarerepresentativeofthesignificantdigitsthatshouldgenerallyberetained.Theproce-duresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsider-ationsfortheuser’sobjectives;anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatobecommensuratewiththeseconsiderations.Itisbeyondthescopeofthisdocumenttoconsidersignificantdigitssusedanalysismethodsforengineeringdesign.1.6Units—T...
