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<br />.' ' <br /> <br />~1.,'t <br />c: <br /> <br />under Section 15 of the Boulder Canyon Project Act. ,All lend <br /> <br />.n5 classified by E. R. Fogarty, Associate Reolamation Econo- <br /> <br />mist, UD a pnrt of tne Colorado Basin Investigation. <br /> <br />The standards of clC\ssifioetioll under ....hich the work <br /> <br />wee done erel <br /> <br />Irrigated Inndl All Imnd which has baen irrigflted, even <br />though the eupply may have been inedequate for a lerge <br /> <br />part of the t1me, BO cle.sscd without regllrd to its quality. <br /> <br />In sowe ceDe~ irri~eted meadow or pasture are so deei6nated <br /> <br />in contr'llllt to other irrigatod land. <br /> <br />Table 3 <br />Arable ~L>'nd Classification Standards <br /> <br />Quelities I Arable - Cless 1 1 Arable - Class 2 <br />J,,,,;,;~ IFine SEe-ndy Loam to Clay ILOe.Jll;f S,~nd to .Friable <br />I Loeml ClaY <br />Depth Ill! inches good ;:>.10' tlo1l 112 inchaa good plow lJoU <br />142 inches y$Il,etre.ble to 130 inches penetrabla to <br />I roots end "8 tar I root" nnd ';voter <br />,AlIrAl~ .No bleck. Mex:imwn of IpH 9.0 or lesa. Perm!se- <br />10.2$ totnl aalts. lible mnxi~um 0.5% totsl Balta <br />Rock dlo 1008e rock norcobble,No more than bas bean r.. <br />Ito bother cultivt\tion Imoved from ai:n11er lands <br />Topogrepb.;vIGeneral grade 5:' maximUlU ISmooth 5-:10% alopell or 5~ <br />:for large '~mooth bodies, Ii! rough, 86 much grading <br />I needing no grading nnd I end leveling ae eimllar <br />:little levelin~ :land now cultiveted h~o hed <br />Drainage 15eepllge llot apt to lltlU't lMay seep but can be drdned <br />lbut can be drained chenp-lwitllQut prohibitive cost, <br />llv if reouired lartificiallv. <br />"Whera 13011 depth ov~r gr~vel, coeree sand, or brok~n rock, <br />approaches the m1n1mum for its cless, texture IIIUtlt be at leallt <br />ell heavy all fine ~t\nd1 loam. <br />Class 6 - Non-Arable. .Arens were placed in this clesa be- <br />ceuse of being too tdgh, if-olated, or scattered for water delivery, <br />or for failure to Illeet the stenderdl3 for the ~reble classee in <br />eithor BoilS, topography, or drainege, or combint\tions of uuch de- <br />ficieucies, inoluding mainlYI I!retlll of thin soils owrlyin/i; shale <br />or sandstone in plece; heavy-textured bottom arecs high ill alkali! <br />rough steep breaksJ ennd dune ereesl ~nd rivar bottoms below high <br />\,a ter level." <br /> <br />'.,:'i <br /> <br />,. <br />-',; . <br /> <br />21 <br />