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. <~ '?'!l,Jf . Alternative Plan #5 This alternative has the same inherent problems as does alternative 4. It is shown on the alternative Plan #5 Map and appears on the table of comparative alternatives. It includes three flood retention dams up- stream from Bedrock, Colorado and downstream from McPhee Reservoir. The concept is to reduce the maximum flood through Paradox Valley so that a canal could carry the reduced flood peak capacity. The canal would bypass river flows around Paradox Evaporation Pond created by building a dam across the Dolores River where it exists at Paradox Valley. The flood retention dams would reduce the maximum design flood peak from 70,000 cfs to 41,100 cfs. This is the most expensive alternative arrayed. Alternative Plan #6 This alternative involves damming up Salt Creek Canyon to form a solar evaporati~n.pond in Sinbad Valley. It was found that a reservoir volume of 360,000 acre-feet was required to store the 5 cfs brine flow for 100 years. To provide for the design flood, a total reservoir capacity of 383,000 acre-feet is required. Brine would be pumped from Paradox Valley near the Dolores River through a tunnel and pipeline system to Sinbad Valley. Three pumping plants would pump the brine ~3,500 feet through a 15" pipeline up Paradox Valley to the first tunnel, as shown on the map of Alternative 6. . The first tunnel is 14,000 feet long and connected to the second tunnel (4,600 feet long) by a 1,100 foot siphon. The second tunnel would discharge into Sinbad Valley. The cost of this alternative is arrayed on the summary of alternative com- parisons but a benefit-cost raito is not shown. Additional Alternatives Considered Several other alternatives have been investigated but because of exorbitant costs they are mentioned only briefly in the following paragraphs. O~0604 22