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<br />OUlll69 <br /> <br />PLI\!;;TB RIV:!iR BASIN INi/EUTWATrO!W <br /> <br />PAHT II .. NORTH PLAi'm RTvt:n Dl\SlN <br /> <br />f - llGllloriptiva <br /> <br />26. Topography (COllt'd.) <br />(3) Dominant Features (Cont'd) <br />(e) Great Plains (Cant'd) <br /> <br />, <br />"' <br /> <br />WlueD-oine; the extent of the ooverace by :!lati va vegetation and tho suooess attending <br /> <br /> <br />agrioultural operatiOIll1 without the aid of irrigation. <br /> <br /> <br />StrellllUl oriGinating in the Great PlAins are intermittent in ohnraoter. <br /> <br />They oa.rr,v wllter only at tir.!es of intense rainfalls over tl1eir catohment areas. <br />UllU81ly tl1eir ohannols are dry. and whan _tel' is oonveyed in them its volume twds <br /> <br />to dim1niah. <br /> <br />f.'uch stretll:ls diffor fl'an those of" more humid regionll wl1Elt'e usually tilt <br /> <br />flaws are porennial and tend to inol'GRSe in amount. Tho rellson for porenntal o.nd <br />iJlore1lS1ng flaws in tm qmmt1.ty of water 1n underground storage, oreated tll:ld main- <br />tldned by rn.1nfall, at lavels above the ohannels of tho surfaoe drainage system. <br /> <br />In tila arid regions suoh !l.S tho Great Plains, tho fact of intermittent <br /> <br />G:lld loning stre!lll1 1'1ow voh1lllea. ia evidenoe of the small Dmountn of preoiphation in <br />relation to the rntell of evaporation,. or more spooifioally, of tlw small oontribu'\;:t!lwll <br />to graund. water stortlfilil ma.de by the ooturol preoi,pii:l1t1on. l;1.1Oh oontr:tb1xbions bEliug; <br />insuf:t'ioi ent to mc.inttlin ground wator levels at or above the bottama of: the llUrf'll.Oe <br /> <br />drainage ollannels 0 <br /> <br />In !l. few loolJ-lltisll. llUoh as south of the river in Soottsbluff County. <br />" <br />Nebraska, the sedilnontary deposits are susooptibls of' erosion by Vlind and wator, and <br />!U'o oroded to the point of oreating vihat t'l"oquently a.re termed "bad lend" lJ.1'eD.So <br />Ordinarily, h01'1Ovor. tho Groat Plainn are oharaoterizod by luree, unbroken o:>pEmsell <br /> <br />of "ahort-ernss" covorod lauds, - tho dee;reo of: the oo.or-neo e.nd tho amount of tho <br /> <br />fOl"Il[';O dopondinG upon 1000.1 so11 end oliInatic oondi tionao <br /> <br />-11- <br />