Designation:D6574/D6574M−13(Reapproved2021)StandardTestMethodforDeterminingthe(In-Plane)HydraulicTransmissivityofaGeosyntheticbyRadialFlow1ThisstandardisissuedunderthefixeddesignationD6574/D6574M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheprocedurefordeterminingthein-planetransmissivityofgeosyntheticsundervaryingnormalcompressivestressesusingaradialflowapparatus.Thetestisintendedtobeanindextestusedprimarilyforgeotextiles,althoughotherproductscomposedofgeotextilesandgeotextile-typematerialsmaybesuitablefortestingwiththistestmethod.1.2Thistestmethodisbasedontheassumptionthatthetransmissivityofthegeosyntheticisindependentoforientationoftheflowandis,therefore,limitedtogeosyntheticsthathavesimilartransmissivityinalldirectionsandshouldnotbeusedformaterialswithorientedflowbehavior.1.3Thistestmethodhasbeendevelopedspecificallyforgeosyntheticsthathavetransmissivityvaluesontheorderoforlessthan2×10−4m2/s.ConsiderusingTestMethodD4716/D4716Mforgeosyntheticswithtransmissivityvalueshigherthan2×10−4m2/s.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissued...
