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<br />. , <br /> <br />e '.:~"', <br />'1.,':) <br />'.j <br /> <br /> I <br />EFFECTS ON COLORADO RIVER (annual average) <br /> New <br /> Colorado Mexico Total <br />Stream depletion (acre-feet) 120,700 34,100 154,800 <br />Changes in salt load (tons) -14,720 8,250 -6,470 <br />Changes in salt concentration at Imperial <br />Dam in milligrams per liter (mg/L) <br />From concentrating effects of stream <br />depletion - an increase 14.5 4 1 18.6 <br />From change in salt load - a decrease -1.5 0.8 -0.7 <br />Net increase in salinity levels 13.0 4.9 17.9 <br /> <br />PROJECT COSTS <br />(January 1985 prices in millions) <br /> <br />PROJECT BENEFITS <br />(in millions) <br /> <br />Estimated construction cost <br />Estimated annual operation & <br />maintenance cost <br /> <br />$547.3 <br /> <br />3.6 <br /> <br />Estimated total <br />benefits <br />(average annual) <br /> <br />$36.0 <br /> <br />TOTAL BENEFIT-COST RATIO <br /> <br />1.5:1 <br /> <br />:~ <br />I,' <br /> <br />.1 <br /> <br />"~~ <br />.~ <br />~~ <br />/ <br /> <br />V" <br />