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<br />001070 <br /> <br />li'lA?TE 11IVlm MSUl mC;S'l'IOATIONB <br /> <br />PllRT II - :NORm PlATTE RIVER DA8IN I <br />-- -- <br /> <br />J - Desorivtiv.!, <br /> <br />26. '1'opograpb;{ (Cont' d) <br />(3) Dominant Features (Ccnt'd) <br />(f) Snnd lIill-!.eJ,;e i\nJa. <br /> <br />if <br />.' <br /> <br />One note.blo exoeption~ to the oonditions usually prevailinG over the <br /> <br /> <br />Great Plains. is the Ssnd llill-l.Qke area e::ttendi.llB eAstward. in CGntral i'lestern <br /> <br /> <br />Nebraska. !'ran the c;eneral vicinity- of the town of' Allioncta. Ita !lorthorn border <br /> <br /> <br />(not shQWn on Map Iro. 92127) extends northeo.s'tvro.rd, Generally :/.'ollovring the <br /> <br />Niobrara R1vor vallsy-. Its western bOl'dar extends from near Alliance to appro.;;il!w.tely <br /> <br /> <br />Ookosh. Ita southorn border follows olose to and a.lcmc tho Uorth side 01' the l~orth <br /> <br />Platte River eastward fran Oshkosh. <br /> <br />This entire Sond-Hill area oonsists ot' sandy tuld porous aurfl1Ce soils. <br /> <br /> <br />underlf!in to great dopths by similnrly pOJIOUS sub-soils Ilnd g6lLog1oal formations. <br /> <br /> <br />TIW area is so nbsorbent of precipitation that very few surt'IlOEl drainaga ohanmls <br /> <br /> <br />exist. <br /> <br />:rhe /Jand Ilill area differs !'ran tho usual oonditions preva:lli.ng'in <br /> <br /> <br />the Great Plains, firat. in that its dominant native vegetation i8 lltal1 grass~J <br /> <br />and II eoond, :tn tho fact that ita ground water levels aro (l1.1bstontially hiemr tP-llll <br /> <br />tlie ohannels of surfaco strelllJls in aCljo1ni2l{; areas. <br /> <br />In the Sand Hill area, nature !las oroatad an :immense undercreu."ld storage <br />reservoir. The upp'.)r surfaoes tif the underground reservoir. in plnoes, cpprolloh or <br />exceed the lend surfnoes. giving risa to a multitudo of lakes. whioh are mninte1ned <br />in part direotly by preoipitation and surfaoe rlUlof.r. but primarily'b--; the ground mtere <br />thsmsolves whioh ar suppliod by prel1ipitation ovor tr~ adjoinins sand-hill areas. <br /> <br />-12- <br />