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Modeling Results for <br />Colorado River Basin States' Modeling of <br />Colorado River and Reservoir Management Strategies <br />releases from Powell are constrained to a minimum of 7 MAF, and a maximum of <br />9.5 MAF. <br />Three revisions to the original Hybrid strategy (Hybrid) were also studied to <br />understand the effects of adjusting specific parameters. The Hybrid strategies and <br />Powell normal operations are illustrated in Figure 2 -2. <br />Figure 2 -2 <br />Lake Powell Release Strategies <br />(Elevation in feet; Volume in million acre -feet) <br />Powell <br />Powell Release Strategy <br />Powell <br />Elevation <br />Normal Hybrid Hybrid rev1 Hybrid rev2 Hybrid rev3 <br />Elevation <br />3700 <br />Equalize or 8.23 <br />Equalize or 8.23 <br />Equalize or 8.23 <br />Equalize or 8.23 <br />Equalize or 8.23 <br />3700 <br />602(a) <br />----- - - - - -- <br />- ---- -- - - -- <br />-- --- -- - - -- <br />-- --- - - - - -- <br />----- -- - - -- <br />602(a) <br />8.23 <br />8.23; <br />8.23; <br />8.23; <br />8.23; <br />if Mead < 1050, <br />if Mead < 1100, <br />if Mead < 1050, <br />if Mead < 1100, <br />balance contents with <br />balance contents with <br />balance contents with <br />balance contents with <br />a max release of 9.5 <br />a max release of 9.5 <br />a max release of 9.5 <br />a max release of 9.5 <br />3575 <br />------ - - - - -- <br />----- - - - - -- <br />3575 <br />7.48 <br />7.48 <br />3550 <br />----- - - - - -- <br />----- - - - - -- <br />3550 <br />7.48 <br />7.48 <br />3525 <br />----- - -- --- <br />----- - - - - -- <br />----- - - - - -- <br />----- - - - - -- <br />3525 <br />balance contents with <br />balance contents with <br />balance contents with <br />balance contents with <br />a min /max release of <br />a min /max release of <br />a min /max release of <br />a min /max release of <br />7 and 9.5 <br />7 and 9.5 <br />7 and 9.5 <br />7 and 9.5 <br />3370 <br />3370 <br />Common Assumptions <br />1. Lower Basin shortage strategy: Step shortage (400kaf at 1075, 500kaf at 1050, 600kaf at 1025); no AbsPro 1000 <br />2. Initial elevation (content): Powell =3608.56(12.60), Mead = 1135.50 (14.92) <br />3. Surplus in accordance with ISG (2007 -2016) <br />4. 602a storage requirement for equalization is according to the 602a algorithm with the minimum constraint of 3630 through 2016 <br />Hybrid Revision 1 raised the Mead elevation for triggering balancing from 1050 <br />to 1100. Hybrid Revision 2 raised the Powell elevation for triggering a 7.48 MAY <br />release from 3550 to 3575. Hybrid Revision 3 was a combination of Hybrid <br />revisions 1 and 2, incorporating both adjustments. Other parameters remained the <br />same as the original Hybrid. <br />5 <br />