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<br />000328 <br /> <br />Draft - Do Not Cite <br /> <br />4 <br /> <br />August 2003 <br /> <br />Table 1. Characteristics of Release Scenarios Evaluated. <br /> Peak Release dming Ramp Restriction for <br />Scenario Spill Trigger (ac-ft) Spill Years Peak Comments <br />Gage None As measw-ed As measured Serves as historical <br /> baseline <br />Reclamation None Based on existing Same as Western A Serves as baseline <br /> operating criteria for futtn"e operations <br />Western A 950,000 Maximum one day Up: 15% rate of Conservative spill <br /> flow possible given increase or 500 cfs, volume; maximum <br /> volume of excess whichever is higher peak magnitude; <br /> water Down: 15% rate of existing constraints <br /> decrease or 400 cfs, <br /> whichever is higher <br />WesternB 900,000 Same as Western A Same as Western A Less conservative <br /> spill volume; <br /> maximum peak <br /> magnitude; existing <br /> constraints <br />Western C 950,000 Same as Western A Ramp up from base Conservative spill <br /> flow to peak would volume; maximum <br /> occur over a two-day peak magnitude; <br /> period; same for relaxed ramp <br /> down ramp restrictions <br />WestemD 900,000 10,000 cfs maximum Same as Western C Maximum peak flow <br /> release. Duration duration; less <br /> variable depending conservative spill <br /> on volume of excess volume; relaxed <br /> water ramp restrictions <br /> <br />number 09144250), and the USGS Grand JtUlction gage (gage number 09152500), located near <br />Delta and Grand JtUlction, Colorado, respectively. Flow patterns at the Delta and Grand JtUlction <br />gages that would be expectedlIDder the six release scenarios are presented in Figures 7 through <br />12. These flows served as the basis for our evaluation. The gage scenario (Figure 7) was used as <br />the historical baseline and consisted of flows recorded at the Delta and Grand Junction gages. <br />