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Resource: Whoopine cranes <br />? From March 18 to Apri130 and from October 17 to November 10 of each year, and on any <br />make <br />most load changes between 5 AM and 10 AM. Smaller load changes (described in step four (4) <br />of the sequencing below) that do not create a signifcant increase in the stage at Overton will be <br />made at any time. Modifcations to the timing of changes may be made with the mutual consent <br />of the pariies and of the Nebraska Public Power District (NPPD) for so long as NPPD purchases <br />Central's power. <br />departed, to lessen the overnight rise in river stage downstream of the J-2 Return when cycling <br />the J-2 hydro, except under contingencies as identified below Central will use its best will efforts to <br />additional Timin? of days Changes. bcginning When when water is being whooping cranes returned are at the .T- shown 2 to be River present Return, until Central they have <br />operate the J-2 hydro within the following guidelines: <br />Limits on Ma itude of Chan , es. Central can only operate the J-2 hydro at 25% wicket gate <br />position (WGP), approximately 450 cfs, 50% WGP, approximately 1,050 cfs, and higher to <br />avoid causing cavitation damage to the Lulit. <br />Sequencing of Flow Increases. <br />The sequence below will be used to increase flows frona shutdown. If J-2 has already been <br />operating at 25% WPG or 50% WPG for more than one day, the sequence will begin at step 2 or <br />step 3 respectively. <br />l. J-2 will be brought online between 5 AM and 10 AM and operated at 25% WGP <br />? at least until the following morning. <br />2. If Central desires to increase the discharge during the second day of the cycle, the <br />J-2 hydro can be increased from 25% WGP to 50% WGP between 5 AM and 10 AM. <br />3. Between 5 AM and 10 AM on the third day of operation (if flows were increased <br />to 50% WGP the previous morning), the J-2 hydro can be increased from 50% WGP to any <br />desired flow rate up to 75% WGP (about 1,750 cfs). <br />4. Once opcrating above 50% WGP, Central may increase the load at the J-2 hydro <br />at any time provided the total increase in flow at the J-2 River Return over 10 hours is not more <br />than 400 cfs. (Flow at the J-2 river return is currently calculated as the J-2 hydro discharge <br />minus the Phelps Canat diversion.) <br />Flow Decreases. The J-2 hydro can be shut down and the above sequence can be terminatcd at <br />any time. There will be no limitations on the rate of decline. Following the operation of the J-2 <br />hydro as described above, the hydro is expected to be shutdown for one or more days as the <br />system refills. <br />Return of Environmental Account and Program Water. When Central is cycling as described <br />above, EA releases and other Program water will be regulated within Central's system and <br />returned along with other water in accordance with the 4 step process. <br />C1 <br />Water Year 2008 EA AOP 27 October 15, 2007