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3. Outlet Works <br />SEO criteria requires that the low-level outlet be capable of releasing the top five feet of the <br />reservoir in five days starting at the normal high water line (spillway crest elevation). The total <br />volume of water in the top five feet of the reservoir, between elevations 5215 and 5220, is <br />approximately 1,445 acre-feet. The average drawdown rate of this volume over five days is <br />145.7 cfs. A 36-inch conduit, with all losses considered, is capable of discharging 148.5 cfs at <br />elevation 5215 and 156.9 cfs at elevation 5220, therefore a 36-inch conduit meets the SEO <br />criteria. <br />A multi-level intake riser to account for fish releases, would be constructed for Dam Alignment <br />1, and a simple low-level outlet works was assumed for Dam Alignment 2. The minimum <br />capacity for the emergency outlet to release the top five feet in five days per the State Engineer's <br />Office (SEO) requirements was estimated to range from approximately 240 cfs for Dam <br />Alignment 1 to 350 cfs for Dam Alignment 2. According to the Reservoir Yield Analysis, <br />discussed in Section IV, the maximum outflow far dam operations for Dam Alignment 1 is 600 <br />cfs and the maximum outflow for Alignment 2 is 80 cfs. Therefore, the SEO requirements <br />currently control the required hydraulic capacity (flow rate) for the outlet for Alignment 2 only. <br />36 <br />( AECOM <br />2/22/10 <br />' <br />