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<br />'1- <br />I <br /> <br />I <br />\ <br />i <br /> <br />I <br />, <br />! <br /> <br />. <br /> <br /> <br />. <br /> <br />;.~ <br /> <br />replace deficiencies in Hoover Powerplant capacity and energy <br />avatlable to the Hoover allottees which result from the lowering <br />of Lake Mead below elevation 1123 by reason of storage of water in <br />Lake Powell. The United States will also relieve the allottees of <br />costs of extraordinary maintenance of the Hoover turbines and <br />generators resultmg from such lowering. Costs incurred by reason <br />of this paragraph wlll be charged to the Upper Colorado River Basin <br />Fund and will not be subject to reimbursement from the separate fund <br />identihed in Section 5 of the Act of December 21. 1928. or otherwise <br />charged against the Boulder Canyon Project. <br /> <br />4. Until Lake Mead is returned to elevation 1123. and subject to <br />condition 2 above. Lake Powell will be permitted to exceed minimum <br />power operating level only to the extent inflow exceeds turbine capacity. <br />or as required to assure operation at not less than minimum power <br />operating level. <br /> <br />r <br />f <br /> <br />, <br /> <br />I <br />! <br />~ <br />~ <br /> <br />5. When actual runoff through the month of June becomes known. <br />early in July. the likelihood of attaining minimum power operating <br />level at Lake Powell in calendar year 1964 will be reasonably deter- <br />minable. A deci sion will be made at that time whether to continue <br />storage at Lake Powe 1.1 or to release water stored therein in order to <br />raise the elevation of Lake Mead. In arriving at that decision. con- <br />sideration will be given to a comparison of estimated costs to the <br />Colorado River Storage Project and the decision will be, made after <br />consultation with appropriate interests of the Upper and Lower Colo- <br />rado River Basins. <br /> <br />~ <br />~ <br />I <br />~. <br /> <br />PERTINENT STATISTICS, lAKE POWELL FILLING <br /> <br />lAKE MEAD <br /> <br />lAKE POWE LL <br /> <br />Elevation Content <br />(Million <br />acre-feet) <br /> <br />Elevation <br /> <br />, <br /> <br />t <br />I <br />! <br /> <br />Content <br />(Million <br />acre-feet) <br /> <br />Normal Hlghwater 1222 27.3 <br />Rated Head on <br />Power Plant 1123 14.5 <br />Min. Power Pool 1083* 10.7 <br />Nevada Pumps <br />(Min. Level) 1050 8.0 <br /> <br />3700 <br /> <br />28 <br /> <br />3600 <br /> <br />3490 <br />I <br /> <br />15 <br />6.1 <br /> <br />*ElevatlOn below which turbines <br />vibrate. excessive ,cavitation <br />takes place <br /> <br />Lake Powell. March 26. 1964 <br />31.120.000 acre-feet <br /> <br />Lake Powell. May8. 1964 <br />2.576.000 acre-feet <br /> <br />-463- <br /> <br />r <br /> <br /> <br />