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• III IIIIIIIIIIIII III r <br />999 <br />';'';Il7RT'P .) - ^~i.l -, ,^,tt.:~rh arnt. <br />"lJA1'IiR AND RCLATT:D LANll RCSOURCtiS - <br />DOI.ORF.S F.IVL•'R BASIN <br />COLORADO AND UTAH" <br />A Report Based on a Cooperative Study by <br />Colorado lJatcr Conservation Board and <br />llnited States Dep?~rtment o[ Agriculture <br />Dcnvcr, Colorado - September, 1972 <br />Soil. Dfanpi.ng Unit 3: Rock outcrop and very shallow Goils of the canyons. <br />This mapping unit is al.rnlg the Dolores and Say Niguel kivcr.v and their <br />tributaries. Runoff is very rapid beca~!se of the steep stones and shallow <br />soils [:Pith 104± waterholdi.n~ capacities, Sediment yie1A is from less tl!an <br />0.2 to ].0 acre-feet per snuare mile per year. <br />The landscape is characterized by deco sandstone canyons with steep slopes <br />and long very narrow va lleys, and f.loodplains. Small, gently sloping mesas <br />arr. above the canyons. Steeply slooing mesas are above the canyons, <br />Steeply sloping :Illllvial fans border some of the canyon wa11.s. Nuworous <br />interlnitteot dralRaf;PW1V5 dissect the steep slopes. 'I'hc dominant cover is <br />pimaon-juniper. Oal;hrush, scrviceberry; anH grass arc more abundant at <br />higher elevations because of increaced precipitation. IJil.lows and co[ron- <br />wood trees occupy small tracts along the narrow valleys. Thera are a few <br />irriPata~rl llay fie.l.ds whcrr. thr valleys arc w.ulcr. <br />1'h is "nit is composed of two major components. About 45 percent of the <br />a~nit is rock outcrop, mainly sands tone, with some small ontc ro pti of shale. <br />Another 49 ~ercenC of the unit has sha]].ow soils, lees than 20 inches, <br />over underlying sandstone and some shale. '1'Ilese soils are stouv and <br />usually have loamy, ligl?C-covered surface .layers. The remaining G percent <br />of the unit is merle up of soils with dark-colored surface layers and mixed <br />alluvia] soils in the Dolores and San pligucl River bottoms. . <br />1. 5:. '.--cr:; .. .Itlan a•W cl.a rna a[I+[Ih of enll roPp l•g m(ta u! the eeiore, Rlver La,ln 1.+. eo!ornto and Veal <br />it rroa , <br />er .~`_I:~ov. ~ :pa rcnc puntw nt : omuol annual Gee <br />19p or :e la~utlen:proclp lta[fan; terpern[u rc: Par LOd <br />,r:al:pcr<. ~.;; 194a Lrvx croup, YiS;;roup or Lo n~ TYPe Ea:(n (far) (lane a) (!") (Lon) <br />1 :5 Ru<? mW :Cole ou;ea tin R.S 4,)00- 1-LB C1-31 101- <br />:5 L.'p lunolla blmllov over sand.ronu sod 9,000 16] <br /> +CV In) <br />TD Torrlort hence I-linllov n r unJ pen. <br /> n:,e ah~ln) . <br />< Lltnlc Ar elu: Wlls <br />4 eo.ol fl auJ Crycloroll, <br />3 Torrlilurc nt: <br />-- - - - ~~ -- <br /> L'umauont :OUn(nn ur : !a[Ima;.J <br /> paten[ elope ,aJlrcnt Cro alnn M,Jor j <br /> mete real, ;(percent); Yleld proYlrm lend <br /> CAC. fr./ : u-c+ <br /> +q. ml./ ~ <br />So id atone ]S-IOJ (0. ]-1.0 lloderete ahect Itou,e, <br />vt[L + orlon, nn~Y utIJ II(c <br />+hnle onJ Cull lc+, da.-a Y,r <br />•Iluvlcn ,.. vote locally <br />D-7 <br />