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<br />o <br />o <br />~... <br />"'I <br />0. <br />(,;1 <br /> <br />L <br /> <br />that have not been identified to date that will be proven feasible <br />in the future. For example, five flowing wells that together di~- <br />charged 100,000 tons of salt annually to the river were reoently <br />plui\l1cd lit Vt'ry low cost. <br />The twelve projectn involving druinage [rom itrigated dred~ <br />very in size from 100,000 acres in the Unoompahgre Valley of Colorado <br />to se'Jet'a1 small areas in Utah and Wyoming. Control measures applied <br />to these projects would reduce the salt contribution from 600,000 <br />acres of irrigated land hy about 1,680,000 tons annually. th~ average <br />lIt1l1ual coot of thee€! mC[HJurcs has bel'n l'stitnntcd to be $23,800,000. <br />The annual unit cost of sult control mcnsUres for the indiVidual areas <br /> <br />varies from a low of $5 per ton in the Grand Valley of Colorado to a <br />high of $12 per ton in one small area. <br />Local irrigators in all of these areaS would also benefit by <br />the salinity control Rlcasures. There would be increased yields due <br />to lowedng of the wllter l:ab1e, f('rHlizer cOlltfl would be reduced, and <br />l1pcl"atloll (Ind lt1!lint:tlnullce oeM!:!'! of l'Hlla!. de livery flyfJtPt1ll:l would be <br />reduced. <br />An interesting project to control a natural ~oint source of <br />salts is lobat~d in the Parado~ Valley, Colorado, whtoh is crossed by <br />I;.bO.""'J())!8S R.iver and~~_ of its tributaries. The Dolores Rivt't <br />picks up a large mineral lond1i:'om underlying, highly soluble ground <br />, . <br />format ions. The pr'oj ect wO\l2;~~,~.I1~lutle a dctm ahd regulatory reservoir <br />above the valley and an impervious channel through the valley to <br />minimize the interchange between stream flow and ground water, thereby <br />rmlud,IlR the snIt lond hy um,ooo tons annually. Thin proJ({ct: would <br /> <br />-8- <br /> <br />'..-;,;;; <br />