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<br /> <br /> <br />(.:'\ <br />IX' <br />c.o <br />~.. Colorado ~tate ~iniver;:;ity is cClnd, -::t.i:w ....r'e !latn c:.ll. :::t.ion 'ictivities <br />'i1'10 c'/alua:.in,: the suini:;;{ c'-nt!" ;1 e; f"~cts 1lr.r!er c"'n ,r"-tct f!';)ffi the <br />cIJrporatior:. A :;imulation ~oiel ::a:.~ t;c~!: ,levelrrpl':....l -...-:. iei! evalua.tes the <br />e~fectz of c:-:an.g",s in lr::-i[ation ef:.icicnc; on ~alt.-l.)a'l contributlor:!s <br />0.: '.rell as c!1anges in ~cep~e le-oS,sa:.: fr,,!l": tt:e c'.:m"leya'1c'" systett.. T~us <br />model will '1llow the rc;:;ults of tbe dC::J.cnstrati 'n pr:::>ject to be pr'')jected <br />valley-...n.de ana help for:n the basis :~or future :callnit~{ control :"J.cti'li~ <br />~ies in this location. ~c d~or.st~~ti~n pr0ject '~s ~~leted aL lut <br />mid-1972 and the final published !"ep ~r'" is expecte-l s: m. ?u!'".her related <br />studies 1lrC now being conducted i:1 t~::s sa::3e area. <br /> <br />;~PECL:u. .~~.'T;l:'. <br /> <br />3. Florida rroject <br /> <br />Flo'," 3..'1d quality da.ta ....ere cC'..:..l. etcrl at seve.!"al points in '~he ""lo!"ida <br />Project are.!l beginning in lrl~.. :ie:""'lre the pr ice:. ...;as c0nztructed. l.. <br />:::tud~' of these data r"'r the period 1/.< _,.~ :::ho.... ';;h,:- '.?ff~ct ~f irri,-ation <br />)f these Innds on the quality :)f retu..rn :'l,""rs lc-r.lv.inr the area. <br /> <br />Results show that there has teen a .ery "reall a~~~t )f pickup <br />~easured in the river Jown::;tre:un fr.')!:: +;j-JC ir!"igatcd "U''.?a. Th!:' concer:tr:l._ <br />tion of tatal dissolved solids ir. l- in~L:,....-i,n~'" ..."U-t 'r !"J''L!1ges fr"Jm 0.14 <br />to 0.17 ton per acr('-:'oot. and that if the outflDw-in,' -....ater ranges ;rom <br />0.17 to 0.30. /,bout l3,7~O acr~s ",'er. irri[:'1ted at .~hc time the mea.3U!"e- <br />ments ~eYe made. <br /> <br />')ther areas in the '-",)l.,rad~ Rive!' Easin wit:1 si.::lil:l,!' t:.,rpe soils <br />~~rler irriRation would y:eld on~/ ~inor Q~unts of salt. <br /> <br />L. Other Studies <br /> <br />Considerable variation in :.h ef:'ccts of irrit:'atl ~n return flow r:m <br />....-ater quality is to be expected, ~,i :~ferenc~s arise' lue t.o t:-,e size of <br />the irrigated area::;, the n1J::1oer- ," time:: the retu..-rn ~lo."r is reused, prop- <br />erties of the soils nnd drtinOl€e arca. mJ..nb'~!" :::" Yf>ars land has been <br />irrigated, nature ,.,1" aquifers. rain-:-llll. d.iluti ::;n. t,e:rrpe!'ature, irriga_ <br />tirm :!lethods. storllf;e reser+;...;,irs. vep'tati')!"j. 9..'1--1 typc 0:"" return flo..... <br />channels. <br /> <br />Consu..nptive use. ret.urn fl'j.", a..'1~ salini';;:: 3tudie~ are :10-.... being <br />conducted by Federal ae:c:1cies in ccope!"s-:i.:rn ,,'"ith :-'tate and local <br />agencies. Some a:" the study area::. are purposely bein,~ held sr::.all to <br />add_eve bette!' control. bu:. they ...Ill b", as ~'epresen~.~tive as pOSsible <br />of existir>€ prC'ljects. The !"es~::: Dertaining -:'0 the ,:pl:1.......t.:ty ")f ret'l1rn <br />flo~ ....'"i~ be very helpful ir. es~~atinl effects )!'! A-ater 1uality of <br />r~tl~!,! flo~~ fro!::. larger areas ~TIere ~easur~ment of inflow and :utflow <br />is not a1~~s possible or practical. <br /> <br />;pedal studies in areas ... the basin ..;ill cont:JlUe tn be ::lade <br />fYam t~e to tioe to 1ete~ne -~ter 1uali~y c0nditi0ns, and studies of <br /> <br />