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<br /> <br />co <br />0.' <br />(.,- <br /> <br />. <br />- <br /> <br /> <br />CAUSES OF SA.i.IIllT" <br /> <br />Table B <br />"'or'"ribution fro:n :!18.:or sprir,gs 3.::1 ~,ribu'.aries <br />bet~ee:. ~le~ :a~yon and ~oover :~~ <br /> <br />Sou Tee <br /> <br />Dissolied-sollds discharge <br />i ".r,oUsa.'1r:1S of ':0r:3 t'er .':ear <br />. . <br /> <br />Faria Ehrer <br />I.i ':tle Colorado h:lVer aba-'e Blue Sprir>..g <br />Springs in Lower Little ColQrado River <br />Bright Angel rreek <br />Tapeats '"'reek <br />KaT.ab Creek 'base flow) <br />Ha\"asu Creek 'base no'''') <br /> <br />30 <br />130 <br />550 <br />" <br /> <br />]2 <br />4 <br />21. <br /> <br />Total infl~~ in Colorado Piyer <br />'Jlen ,';a:-:yor. Da":", 7,0 Lake :'~ead\ <br /> <br />y <br /> <br />La.'ferkin Springs (inflow ~o .virgir. River) <br />Littlefield Springs inflow to Virp.in Riverl <br /> <br />QC <br />.~ <br />3(" <br /> <br />Total inflow to ~olorado a~d Vir~in Ri'lers <br /> <br />~135 <br /> <br />TI:e dnimu.':l annual inflo.... of 805.000 to;,S from these SOurces results <br />i.' an increase of al-out 62 rr.illLsra:ns per li "er (\.0: ".on per acre-foot) <br />in the Color'ldo River on the basis of an aver8.l7e ar:r.:ual flow of 10.5 <br />~ll!or. acre-feet a~ ~oover Dam. <br /> <br />2. A~'ricultural Sources of Salini+,\' <br />. <br /> <br />It is ant icipa.+ed t:ba' de.,'elop::1en+ of ne.... i rri;<:a+iorl pro,-;ec:;s may <br />i"crease tr,e "'otal dissolved solids ir, :r.e ('olarado River. Returr. flows <br />from the irriga'ed lands pick up salts from ':he soils ar,d U' d~rl:/ing <br />shales a"d tra~spor~ ~hem to +~e river sys~em. <br /> <br />Studies prior to irrigation would be helpz~l. but they have not been <br />rade in most areas, so comparisons must 1:Je r:'.aje ....hen ne... land is a-1r:ied or <br />ne.... storage is ~sde available. <br /> <br />Salt balal'.ce :::or:;:.i tions exist '..her:. the amoullt of dissolved so111s <br />carried off the land is equal to that amcur.t added. PiCff.Up of salt as <br />used in this report represents aL unbalanced condition sho;.T, by the in- <br />crease of total 1issolved-soli1s load in the r~~off over the total load <br />in the applied ;.;ater. T!tiz p::ci:''.lp !'rom an area could result from natural <br />sources, such as precipit~tior. ~~~off, and/or irrigatio~ return flows. <br />Salt pickup chargeable to irrigation would be or.l:,- t.hs:t- addi tion~l ....hich <br />occurs as a result of irri~ation and should not ir.clu1e the a=ount of <br />~rior pic~~p o~f the land resulting fro~ r~tural sources. <br /> <br />27 <br /> <br />