Designation:D5472/D5472M−14StandardTestMethodforDeterminingSpecificCapacityandEstimatingTransmissivityattheControlWell1ThisstandardisissuedunderthefixeddesignationD5472/D5472M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestdescribesaprocedureforconductingaspecificcapacitytest,computingthespecificcapacityofacontrolwell,andestimatingthetransmissivityinthevicinityofthecontrolwell.Specificcapacityisthewellyieldperunitdrawdownatanidentifiedtimeafterpumpingstarted.1.2ThistestmethodisusedinconjunctionwithTestMethodD4050forconductingwithdrawalandinjectionwelltests.1.3ThemethodofdeterminingtransmissivityfromspecificcapacityisavariationofthenonequilibriummethodofTheis(1)2fordeterminingtransmissivityandstoragecoefficientofanaquifer.TheTheisnonequilibriummethodisgiveninTestMethodD4106.1.4Limitations—Thelimitationsofthetechniquefordeter-miningtransmissivityareprimarilyrelatedtothecorrespon-dencebetweenthefieldsituationandthesimplifyingassump-tionsoftheTheismethod.1.5Thescopeofthistestmethodislimitedbythecapabili-tiesoftheapparatus.1.6AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.6.1Theproceduresusedtospecifyhowdataarecollected/recordedandcalculatedinthisstandardareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatshouldgenerallyberetained.Theproce-duresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsider-ationsfortheuser’sobjectives;anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatocom-mensuratewiththeseconsiderations.Itisbeyondthescopeofthisstandardtoconsidersignificantdigitsusedinanalysismethodsforengineeringdesign.1.7ThevaluesstatedinSIunitsaretoberegardedasstandard.Ration...
