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<br />501 LS <br /> <br />Sails in the basin range fram deep laess ta",shallaw sails develaped an residuallimestane <br />and shale. (6)The upper basin is compased predaminantly .of deep, friable sails' with a medium <br />textured tapsail. The permeability .of these sails is generally gaad. rartians .of Clay and <br />Fillmare Caunties have sails, with th~ck, fin,e textured subsails with a slow rate afinfiltratian. <br />Abaut 14 percent .of the, upper basin is de(icient in surface drainage and sails here have a well <br />develaped Claypan. (6) This' type of claypan sail severely reduces percalatian .of precipitatian <br />inta the graund water aquifer: <br /> <br />The lawer basin: is charact~rized' by"deep sails ,.of ralling laess-capped hills aver glacial <br />till. The tap sail is fria~le and partly underlain with a maderately heavy ta heavy cIaypan <br />subsail with 'fair ta., paar permeability. Limestane and, sandstane .outcrops may be faund an <br />the lawer slapes adjacent,}b principai 'drainageways'in the'lawer basin. These sails are quite <br />shallaw and .have limited :agricultural use. <br /> <br />Alluvial sails"covermuch .of the, valley alang the main stem .of the Big Blue River. n~ese <br />sails are mastly silt loams, and silty-clay laams, with same gravel .outcrops. Several terraces <br />.occur in the valley alang the mainstem. They are',located far the mast part abave present day <br />flaad-crest lev~ls.' " ' ' <br /> <br />Capability .of sail types in the basin is shown in Figure 2: Capability refers ta the soils' <br />limitatians .or hazards .of use, under existing, canditians. Factars .of slape, sail depth, drainage, <br />and erasian are cansidere'd in determining the sail capability. The Big Blue Basin has a high <br />percentage of high quality lands (class ,1' arid 2) having .only slight u~e limitations. ' <br /> <br />SOIL CAPABILITY CLASS <br />BIG BLUE RIVER' B'ASIN L!. <br /> <br />CLASS <br /> <br />LIMITATIONS <br /> <br /> <br />1ZII <br />0.9%" <br /> <br />I No limitations in use <br />'II Slight limitations in crops and practices <br />III - More serious limitations in crops and practices <br />IV ~ Very severe limitations on cultivation <br />requiring careful management <br />V - Limitations because of excess water <br />VI - Unsuited tor cultivation; largely range, <br />woodland w!th careful management <br />(Amount of class V land in the basin <br />is insignificant) <br />11 - Agriculturalla~d ~nly <br /> <br />SOURCE: Soil Conservati/:)n Service <br /> <br />:,' <br /> <br />F\G.2 <br /> <br />10 <br />