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.r - 1 • <br />i .~ ii <br />"4:ATF.R AND RELATED T.ANn P,ESOUitCES - <br />DOi.ORES RIVER BASIN <br />COLOP.ADO A\D UTAH" <br />A Report Based on a Cooperative S[udv by <br />Colorado idater Conservation Roard and <br />United States Department of Agriculture <br />Denver, Colorado - September, 1972 <br />Soil Pfapping Unit 2: F.eddish-broc+m soils of the dry valleys. <br />Ttiis ~::a~ping unit is in Sinbad, Parado:<, Lisbon, and Big Gypsu:-) Valleys, and <br />Dr,' Cre_ Basin. It is not extensive but contains soils used for. irrigation <br />and those suitable for potential irrigation. <br />The landscape consists of long, parrots, gently sloping valleys that are <br />surrounded by steep slopes and cliffs. Each valley 1)as a main intermittent <br />drainageway with numerous Bullied tributaries. All drainaeecaays ar+=_ eroded <br />to depths of 10 to 30 feet and widths of 1_0 to 50 feet. Cover is dominate].y <br />sagebrush with rabbitbrllsh, shadscale, greasecanod, and grass. <br />This unit is composed of about 75 percent reddish-bro(on, calcareo(ts soils <br />with light-colored surface layers that are loos in organic matter. :surface <br />layers and subsoils are moderately coarse to moderately fine textured. <br />Depths to underlying parent material ranges from 30 to more thaw 60 inches. <br />Post of these soils are suitable for irrieation. Runoff is medium. 1Jater- <br />holding capacities are moderate to hieh. About 20 percent of the u[cit has <br />grayish-brown, moderately fine and flop textured soils derilred from Plancos <br />S;!e1e, Tha organic matter content is lots and salinity is moderate. The <br />soils are c_lcareous throughout the profile. Runoff is rapid and t})e caster <br />ero.s.ion hazard is high. The remaining 5 percent consists of shallot] soils <br />caith gypsum shale or sandstone at depths of 20 inches or less. Ptose of the <br />gypGUm ~s in the upper reaches of Paradox and Bi.g Gypsum Valleys. 7:hese <br />soils have little vegetation and are severely eroded. R(lnoff. is rapid and <br />the erosion hazard is high. <br />...-.r l.- ,.e pa.!c L+.+.~~.1 e.avx [er Ltles or sa!I repp!:p cetu u- ...- ?alora 3loc^. 9asl+!~ Co:o: edo a^.'_ ::: a.`. <br />.. .. :rasa <br />rr+ec lci o~ ^: meY~^erl ~~,: : - vl .'-~[ tree 1 <br />n[!cq pr.c :pitv[!en: tccpcra:cvc; r:ad . <br />~. !•>. r<.,:: l9'%5 Lrc:: r:ra,p, ..: o~:, or _~r_ . ~pc .c.to (i: c[) (!vch s) G•) - (b n) <br />]: -- ..cos <br />]B To: rl[L:v'e[z <br />SO [s:Ss[hlds <br />l0 ILylc p;lds <br />~ .:: trna:d, <br />4.5 5,0 ^_J- )-1? 45-50 ll5- <br />),W9 4.i ' <br />U~-dv¢ :po.-a npvr rz cd <br />pn:_,[ s!c,. scJloac C ;W.a)e- <br />[ ne. ~^~i nls :(Ferrmm): held vroy cos -a - - <br />s9. rl./ <br />rr.) <br />----._ ~ <br />Senl.:c +: ]-IS 11.5 -].0 .'., le o:- - - - <br />o Rrv.~- n-d~;- !yr c-o;!r.! <br />r rr stc-~: <br />