Designation:D6326−08(Reapproved2014)StandardPracticeforTheSelectionofMaximumTransit-RateRatiosandDepthsfortheU.S.SeriesofIsokineticSuspended-SedimentSamplers1ThisstandardisissuedunderthefixeddesignationD6326;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversthemaximumtransit-rateratiosanddepthsforselectedsuspended-sedimentsampler-nozzle-containerconfigurations.1.2Thispracticeexplainsthereasonsforlimitingthetransit-rateratioanddepthsthatsuspended-sedimentsamplerscanbecorrectlyused.1.3Thispracticegivemaximumtransit-rateratiosanddepthsforselectedisokineticsuspended-sedimentsampler/nozzle/containersizeforsamplersdevelopedbytheFederalInteragencySedimentationProject.1.4Throughoutthispractice,asamplersloweringrateisassumedtobeequaltoitsraisingrate.1.5Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD4410TerminologyforFluvialSedimentD4411GuideforSamplingFluvialSedimentinMotion3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthispractice,refertoTerminologyD1129andTerminologyD4410.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1approachangle—theanglebetweenthevelocityvec-toroftheapproachingflowandthecenterlineofthenozzle.3.2.2approachingflow—flowimmediatelyupstreamofanozzlesentrance.3.2.3bagsampler—asuspended-sedimentsamplerthatusesaflexiblecollapsiblebagasasamplecontainer.3.2.4compressionrate—...
