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<br />~ <br />r-: <br />co <br />c\! <br /> <br />c: <br />Js?~ <br /> <br />2. Plan 2: Cliff + Modified Roosevelt + New/Modified <br />Stewart Mountain Dams + Nonstructural Measures <br /> <br />This plan limits construction at Cliff and Roosevelt Dams <br />to that necessary for SOD purposes. Flood control, provided by the use <br />of the surcharge space at Cliff and Roosevelt in combination with <br />nonstructural flood damage reduction measures downstream would reduce <br />the 200-year flood to 157,000 cfs and the 100-year flood to 150,000 cfs <br />at the airport. Increased water supply for CAP (16,000 af per year) <br />could be developed by additional water conservation at Roosevelt <br />Reservoir. Because this is a limited structural plan, additional <br />recreational facilities would be provided. New Roosevelt Dam is not <br />being considered in Plan 2 since this is a SOD only plan, and the <br />existing Roosevelt Dam can be reconstructed for SOD purposes. <br /> <br />3. Plan 3: Confluence + Cliff + New//1odified Roosevelt <br />+ New/Modified Stewart /1ountain DaMS <br /> <br />Under this plan, a dam at the confluence of the Salt and <br />Verde Rivers (see Figure 1) would be constructed as well as Cliff, <br />Rooseve lt, and Stewart Mounta in Dams. Cl i ff and Roosevelt Dams woul d <br />provide flood control, new conservation space, and SOD. Confluence dam <br />would be constructed for regulatory storage purposes. Confluence [lam <br />would connect directly with the Salt-Gila Aqueduct via a pumping plant <br />and canal. Under this plan, the 200-year flood would be reduced to <br />between 92,000 and 70,000 cfs and the 100-year flood to 55,000 to 50,000 <br />at the airport. The CAP yield could be increased by 163,000 af per <br />year. Conceptual recreation plans include new recreation sites for <br />Confluence, Cliff, and Roosevelt Dams. <br /> <br />4. Plan 6: (Agency Proposed Action) New Waddell + Cliff <br />+ New/Modified Roosevelt + New/Modified Stewart Mountain <br />Dams <br /> <br />New Waddell Dam would replace the existing Waddell Dam at <br />Lake Pleasant on the Agua Fria Piver (see Figure 1). It would be <br />constructed for regulatory storage and would provide incidental flood <br />control. New Waddell would be connected to the CAP Granite Reef <br />Aqueduct by a canal with a pumping plant. The CAP water supply would be <br />increased by 137,600 af per year. Flood control, additional water <br />conservation, and SOD would be provided at Cliff and Roosevelt. This <br />pl an woul d reduce the 200-year flood at the airport to 92,000 cfs and <br />the IOO-year flood to 55,000 cfs. Conceptual recreation plans include <br />additional sites at New Waddell, Cliff, and Roosevelt. <br /> <br />5 <br />