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<br />~,!"J-: C:;<< 0 <br />'..... ~,' -4. ';--.... 0 <br /> <br />25 <br /> <br />>'] <br /> <br />:;;1 <br /> <br />11 <br /> <br />Salt~Ba1ance. The salinity of the native flows and imported water, <br />expressed' as total dissolved sol ids, are nominally about 50 mglL This <br />water is apPlied to the irrigated lands adjacent to the tributary <br />streams. After spring runoff, about July, the flows in the tributary <br />streams are comprised mostly of return flows, and salinity levels are <br /> <br />'i;; ;,;:! <br /> <br />lands on the tributaries and the main stem. <br /> <br />Thus salts are leached <br /> <br /> <br />about 12QO to 1400 mglL These are the waters diverted to th'e lower <br /> <br />from the upper irrigated lands and are applied to the lower' irrigated <br />lands. It is especially important, then, that the salt balance for <br />these loil'er lands be restored if irrigated agriculture is ' to be <br />continuous. Prel iminary evidence indicates salts may be accumulating on <br />some of the lower lands within the Basin. <br />Summ.ry. Despite the availability of only 1.5 million acre-feet/ <br />year replenishment in native surface water flows and imports, the annual <br />surface withdrawals are 3.5 million acre-feet. This results in are-use <br />factor of about 2.5 to 3.5; in other words the virgin water supply is <br />withdrawn;an average of about 2.5 times. With each withdrawal, consump- <br />tive use ~ccurs, depleting the available supply until only a part of the <br />original flow remains at the Colorado-Nebraska state line. The water is <br />used to the point that flows across the Colorado-Nebraska state line <br />average o~ly about 300,000 acre-feet annually. <br /> <br /> <br />;j '~ <br /> <br />J." .. .. <br /> <br />'---.,,<- - <br /> <br />'j~ <br />~,; <br />~, . ,~ " ,', "~:.i " ,:,'ij <br />J~;', ~,~h, ;i,\.~",ill;,,:' ~~""t;l <br />