Designation:D6629−01(Reapproved2012)´1StandardGuideforSelectionofMethodsforEstimatingSoilLossbyErosion1ThisstandardisissuedunderthefixeddesignationD6629;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—6.1.1waseditoriallyrevisedinMay2012.1.Scope1.1Thisguidedescribesmethodsusedforestimatingsoillossesduetorillandinterrillerosion.Allknownmethodsforwatererosionwithasedimentyieldcomponentarelisted.Thisguideprovidescompletereferencecitationsforthevariousmethodscurrentlyusedtoestimatesoillossbyrillandinterrillerosion.Thereferencedmethodscontaintherationaleanddetailedproceduresfordeterminingrillandinterrillsoilloss.Foreachmethodlisted,specificapplicability,limitations,andlevelofcomplexityarebrieflyoutlinedintermsoftherelativespatialscale,landuse,hydrology,erosion,timescale,inputrequirements,andoutput.1.2Thereferencedmethodsweredevelopedforspecificusesandmaynotbeapplicableinallcases.Forexample,someofthevaluesderivedbythesemethodsestimatetheamountofsoilmovementonafieldwithoutre-depositionwhileothersaccountforre-depositionandestimateoff-fieldsedimentyield.Mostofthesemethodsarenotintendedtopredictsedimentyield.1.3Metric(SI)Units.SomeofthemethodsinthisguidearewritteninthepreferredEnglishunits.Adiscussionoftheconversionofthefinalanswertometricunitsisincludedinparagraph6.2.1.4Thisguideoffersanorganizedcollectionofinformationoraseriesofoptionsanddoesnotrecommendaspecificcourseofaction.Thisguidecannotreplaceeducationorexperienceandshouldbeusedinconjunctionwithprofessionaljudgement.Notallaspectsofthisguidemaybeapplicableinallcircumstances.Thisguideisnotintendedtorepresentorreplacethestandardofcarebywhichtheadequacyofagivenprofessionalservicemustbejudged,norshouldthisguidebeappliedwithoutconsiderationofaproject’smanyuniqueaspects.Theword“Standard”inthetitleofthisg...
