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<br />EFFECTS ON COLORADO RIVER AT IMPERIAL DAM <br /> <br />Estimated Stream Depletion (acre-feet/year) <br />Estimated Effect of Salt Loading (mg/1) 3/ <br /> <br />80,900 <br />1.0 <br /> <br />PROJECT COSTS (Oct. 1986 prices) <br /> <br />Estimated construction cost <br />Estimated annual operation and maintenance cost <br /> <br />432,951,000 <br />1,761,400 <br /> <br />BENEFITS <br /> <br />Estimated average annual benefits <br /> <br />17,504,300 <br /> <br />3/ The 100-year average salt load concentrating effect is 1.0 mg/1. The <br />concentration diminishes to zero after 80 years of the project <br />operation. <br /> <br />7 <br />