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<br /> <br /> <br />c'") <br />co <br />U1 <br />Co, <br /> <br />'AP " <br /> <br />"'ArJSF~ <br /> <br />"'_J\! ,," <br /> <br />A.. ;-:'al ~ ..,aadin,- <br /> <br />L :'iatural Sources of ~alir;itv <br /> <br />nspec~_ion of ~ .e no',,' an1 qua i- re~o!"j.:: r<e't<:al::: a~ alO!1,~ <br />cert,ai:: reac1-es of ~:t,e ""olorado .Ri-ter -': ,en~ !ire ]ar,'e incr,=,ases i ..e <br />dissol.red-solids loa.d ~ ;a" ~anr.o' t/O' at: rib~+e1 ~o i!-ri.'3,- io" or o' _er <br />~.a:, rela~ed ar:-'i'rit.y. "': is iL,",r'!asc is ~.3.ir.' dul':;: ',0 :.a':ura; 1iff~;seri <br />Sources and salir,e srri ~s I!, the "olo!'ado i.j./e!. 'asin. <br /> <br />r;atural diffused sources "U"e tho~.e sources )l~ salt contribution <br />...-hich occur grad,ually over lone reaches ('If the riy'?r syste:n. Salt <br />pickup occurs over large areas of suri'ace A..'1d lJ...'1derlying seils, fro:') <br />strea"!l channels a'ld banks. :\.'1d ir: dif_ficult to identify. l!l~asu.re. <br />or control. r.~s source contributes the largest oVer~ share of the <br />snlts to the Colorado River. ?latural point sources nre mainly saline <br />sprinrs wnere the contribution of snIt and '~ter is ~asl1y irtentified, <br />issuing from sin[le or concentrated sources. <br /> <br />Very little information was obtain! 'j prior to ir.!.igation and there- <br />fore more studies ar~ ne~r:lcd to identify the :nagnitu'le of" speciric <br />natural sources o~ salinity in the Color1rlo River ~asin. <br /> <br />Uuner Basin.--Past records indicate an increase in s~t load in <br />the Lak~ Powell area above Lees F~rrJ and below the ~reen River. Cisco. <br />and Blurr stations. lorns and others (lY~5. p. 2QJ presented estimates <br />of dissolved-solids loads in this river rench based on t~~ peri~l <br />IJ14-57 adjusted to 1957 conditions of developtlent. Unaccounted inflow <br />o~ dissolved-solids in this reach amounted to about 5 percent of the <br />load at Lees ?erry. Host of this re~'.u :~1 from nat\a-al di:'f'used sources <br />with the 3an :i.afael and Dirty ~evil areas fairly heav:,r contributors. <br /> <br />Other areas in the Upper Basin .."i th 1arre BmotL'1ts of natural <br />diffused sources of' salt are the:;:ra."'.d Valley. ';ncompmt.,'Te. lO;."er <br />Gunnison. cmd l'lcEl.!~o Creek areas in :olcrado. Price, 31ld T1i.ntah Basin <br />in Utah alld Big Sa.'1dy River area in Wyoming. Alti::ough a large amount <br />of salt pickup in these areas is due to natur-.u. ru.'1off. sane can be <br />attributed to irrigation. <br /> <br />'latIe A sum=-.ari::es ir.fo~.a+:io:'. aco'.:~ . ,e cor.'ri. j~::o: 0'. ....a":er <br />ar,j dissolved sal:s t-;; spri:-:gs ar,d ''''ells '_0 .'le opper "'olorar:io F-:iver <br />s:;5':e:::. Alttl0ue:-: wells are r.'la~ -rr.a.de a'~d .0. a. r_a""Jr~' sour~e. 9.r9.:-:- <br />1o::ed salLe no"..i:-.... ....e1ls are s-',O'....." -.n... '.e :a'ural sprir.o;s. ......'e <br />lar,-~s~ cor:-I-ribu"ors i :::e'ipper .asir !ire ~ e -()~sero !l.,,:d :le".....ood <br />S?d~..s ......r:ic:. surpl:: .;_€ r.Ja,ior rar' of ~ .e sal~_s :-'!'c- ~; - so,Jrr:es. <br /> <br />'- <br /> <br />