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<br />I <br />• <br /> ~ <br />r~- <br />-_- <br />,, <br />;~ ~_ <br />~ ... <br />UIIfIM Classl}(cation - TM Uni}ISe Sell Classlficaf ion system Is DasW On <br />Ioenflflcsflan of Bolls eccaroing fc fnalr to xturo an0 plastlclfy and fholr <br />psrfornsncs as cool nserlrr) construction rater iel. (forps of Englnoors, U. s. <br />Arv}, Tad.n lcal W'~orandua Ho. 5-357, Yol. i, Varcn 19531. In tnli sYSton, loll <br />asterlals al vldod Inro IS classes: 0 classes ere for coarse-grel noo eaforlel <br />(p1, CF, C71, OC, Sr, SM, SC), for ilrr-grelrr0 IML. CL. OL, MI, CH. OH). aM 1 <br />for organic roterlal lPf). <br />AASFD Cl asslficatlon - Nost Digftray eng inears classify soil roterle is accore- <br />Ifg f0 fl+e syT vela approved DY iho Arorlcan AssoclaTl on o! Stets Hirhray 0}fl- <br />clals. (HlchraY fiassartn Oxrd Procoedln~s of tM 25th Annual sYlat log, 1943). <br />TDis clessiflcatl on Is Dasetl on tre gracation, 11 ,u:o Ilelf, ono plasifci ty <br />IIWa: o} too Sol 1. HlghraY per}orrance Das Doen rota Teo to Mls sYSten Of <br />class) licatlon. All soil nsterlals ere places in Soren principle groups. TM <br />groups -enge iron A-I (gravelly Bolls o! ntyl Gearing capxlty, too Doss .Bolls <br />Ior suD~reles) to A-7 (clay Solis M+1 ng for strength rMn wf, the pcor'esf <br />soils for suDgreoesl. <br />Rreenf o1 /4+srlal Fessinq Slow - 7ne eoesureA ar osfllaeted pereanfagos o} <br />eaterlsl passing me numours 4, 10, 40 i iC0 sieves Is given for eecn ra;or <br />horizon, Moen more Is vary little growl-slzo raterlal (110. 4 ens 10 slow) <br />presont, the Farcont passing iM 200 stove apDroxlrotes Me ampunf of sl if ctrl <br />clay. Y,11uos en roun0 oo oft fo iM nearest S percent. A range Is Ilsteo De- <br />Cause o} fM rarieDlllty for a given sot 1. <br />PermseDlliry -Values Ilsfoo ero esf laetes e} fhs ronga In rate arW tilro It <br />tekos for Ewnaro moroe0nf o1 rotor In 1M eaJor soli layors rnon saruratoo, <br />Duf el loved to drain freol y. 7.'w ost laytof ere Desod on loll texture, soil <br />ffrucffJro, svei leD le oats on porrnaaDillfy and In}litre( ion Costs, end Oraln- <br />ege ollserreTlons of iM rotor awomonf tnrtr.,gn soles. In aosf cases, Darti• <br />Culerly rifn loll hors zone that ero nlyh In clay or oroar lc mstfer, pomcaDlllfy <br />fetes unCer unssfurato0 con0ifions ero cons ldaraD ly hlghor fnen too values <br />given Mrs. On a given loll type, parcolatlon tnrougn fns surfaco leyor varlos <br />Occoroing fo lane use end ronagemonf as roll as rlfn Initial mot store confonf, <br />AvellsDle Meter Eapeclty -rho suet la6le rater capeclfV Is given In Incnei per <br />Inch of soil for fro mayor Mrl tons. Those ostiratos ero Ior cultiratoo Solis <br />v11A rndorato strut to re and organic matter eonfont, and avoraoo Dulk densltlos. <br />AVaI IOD IO ra TBr capaGlfy Of th0 3011 In Incnps Is MO OI }fOrpnCe DOtVCpn flBld <br />capacity (I/3 Dtmpspnaral ono the rllting porcontage fi3 aTmospnore) limos Oulk <br />oonsity tiros Tno ih lcknoss In Incnos Of fM Sol 1, TAO ra for rotontlon Dy Ball <br />Is rolefod fo too pert lcle size and To foe arrnncas~ent and sl zo of the Boll <br />poros. Flno-to.'uree sot is ton0 fo havo nlgner rater rotonflon ouo to small <br />poros Men do sandy Solis rlfA large pores. Estlrotos of iho ev~IlaD le rater <br />Capacity for Solis rifn norrally hi~n ra Ter tasle• r`a! eoooar moan) ngloss until <br />ono considers the possl Dl llty of arfif lclal oral nags Cr ins natural la.er!ng <br />of TM rater feDle during Ory :oesons, Or leto suarxlr or fat 1. Solis of Mo <br />sees forlos vary Irani placo to pleco; Mersfore, values can Oovl ate consloor- <br />eDly }ran those Ilsieo. <br />1 <br />:;. <br />V... <br />~" ' <br />~~~~ <br />~.'; <br />_~ <br />%9', I . <br />c:~~. <br />~,; <br />a r <br />~f ~ <br />k-': I <br />:~ <br />~: t. . <br />.i. . <br />