Designation:D4511−11(Reapproved2020)StandardTestMethodforHydraulicConductivityofEssentiallySaturatedPeat1ThisstandardisissuedunderthefixeddesignationD4511;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthehy-draulicconductivity(permeability)ofessentiallysaturated,intactcylindricalspecimensofpeatwhenthehydrauliccon-ductivityisgreaterthan1×10−7m/s(1×10−5cm/s).Duringthetest,thespecimensarecontainedinthecoreholder,orinright,regularcylindricalsectionscutfromthesamplingtubeinwhichtheywereoriginallyobtainedinthefield.1.2Hydraulicconductivityiscalculatedonthebasisofthemeasuredconstantflowratethroughthespecimenunderconstanthead.2Forverification,flowratedeterminationsmaybemadeattwoormorevaluesofconstantheadwithcorrespondingcalculationsofhydraulicconductivity.1.3Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareprovidedforinformationonlyandarenotconsideredstandard.1.3.1Theconvertedinch-poundunitsusethegravitationalsystemofunits.Inthissystem,thepound(lbf)representsaunitofforce(weight),whiletheunitformassisslugs.Theconvertedslugunitisnotgiven,unlessdynamic(F=ma)calculationsareinvolved.1.4AllobservedandcalculatedvaluesshallconformtotheguideforsignificantdigitsandroundingestablishedinPracticeD6026.1.4.1Theproceduresusedtospecifyhowdataarecollected/recordedandcalculatedinthisstandardareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatshouldgenerallyberetained.Theproce-duresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsider-ationsfortheuser’sobjectives,anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatobecommensuratewiththeseconsiderations.Itisbeyondthescopeofthisstandardtoconsi...
