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<br />3. 602a Storage Replaced with Constant Powell Elevations <br /> <br />Because the 602a algorithm requires a fixed value as Powell's minimum release, the recent <br />modeling of Powell operation alternatives that include several minimum releases corresponding <br />to ranges of elevations has substituted the 602a storage as a condition for equalization with a <br />constant elevation of 3630 ft (14.85 MAF) at Powell. More recently, in an effort to restore the <br />increasing nature of the 602a storage, resulting from the projected increase of future Upper Basin <br />depletions, a step function whereby the minimum elevation for equalization is 3630 ft through <br />2016 (the final year ofISG interim 602a storage) and thereafter raised to another constant <br />elevation has been introduced. <br /> <br />To roughly estimate a constant elevation representing the 602a storage beyond 2016 we have <br />computed the 602a storage for 2008 (the year that the 602a storage algorithm will approximately <br />match the ISG interim 602a storage) and for 2020, representing 12 years beyond 2008 of Upper <br />Basin demand. The 602a storage algorithm computations assumed a minimum objective release <br />of8.23 MAF. The difference between the 2008 and 2020 602a storage values is 2.64 MAF. This <br />differential is added to 14.85 MAF (the ISG interim 602a storage) resulting in a storage value of <br />17.39 MAF which is roughly equivalent to the elevation of 3651 ft. <br /> <br />The graph on the following page plots the Powell portions for the various 602a storage <br />assumptions discussed in this document. The blue and pink: lines represent constant elevations as <br />discussed in Section 3. The yellow and turquoise lines represent Powell's portion of the 602a <br />storage with and without the protection of the minimum power pool at Powell, as discussed in <br />Sections 1 and 2. <br /> <br />9-19-05 <br /> <br />DRAFT <br /> <br />Reclamation <br /> <br />