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<br />.~ <br /> <br />EFFECTS ON COLORADO RIVER AT IMPERIAL DAM <br /> <br />Estimated Stream Depletion (acre-feet/year) <br />Estimated Effect of Salt Loading (mg/l) 3/ <br /> <br />80,900 <br />1.7 <br /> <br />PROJECT COSTS (Oct 1989 prices) <br /> <br />Estimated construction cost <br />Estimated annual operation and maintenance cost <br /> <br />$4SI,763,000 <br />$ 1,936,400 <br /> <br />BENEFITS (Oct. 1989) <br /> <br />Estimated average annual benefits <br /> <br />$17,800,OOO <br /> <br />3/ The 100-year average salt load concentrating effect is I.D mg/l. The <br />concentration diminishes to zero after SO years of the project <br />operation. <br /> <br />7 <br />