Laserfiche WebLink
<br />. <br /> <br />WATER SUPPLY <br /> <br />uses and still meet its compact obligations for flows at Lee Ferry for <br />the benefit of the lower basin and Nexico. <br /> <br />The estimated totel active storage capacity available in Fisoal <br />Year 2062 in the four authorized units after sediment encroachment is <br />shown in the following table. This available capacity may be appro- <br />priately referred to as r~placement storage capacity since it will be <br />used, among other things, to replace to the lower basin an appropriate <br />part of the natural streamflow consumed upstream in the upper basin <br />during prolonged drouth periods. <br /> <br />. <br /> <br />Estimated active storage capacities in Fiscal Year 2062 <br />(Unit--l,OOO acre-feet) <br />Sediment deposition to Remaining <br />Fiscal Initial end of Fiscal Year 2062 active stor- <br />year of active In dead In active age capacity <br />initial storage storage storag~ in Fiscal <br />Unit stor6ge___c_apadty capacitL__<:..B:Jlacity Year 2062 <br />Glen Ca::..yon 19 3 21,505 5,21)0 4,180 17,325 <br />Flaming Gorge 1964 3.600 70 130 3,470 <br />lIavajoI! 1964 1,028 250 80 948 <br />Curecanti 1969 720 10 20 '1!t0 <br />Total 26,853 5,590 4,410 22,) <br />II The storage capacity at the Navajo unit may be needed <br />ultimately by the potential Navajo irrigation project and other local <br />developments and hence may not be available to meet compact obligations. <br />This situation will be reviewed when the Navajo irrigation projeot is <br />authorized. <br /> <br />Reservoir operations <br /> <br />Two studies were made of the coordinated operation of the four <br />authorized units of the storage project. The first ~~s an initial <br />reservoir filling study to bring the reservoirs to power operating <br />levels and to roughly det~rmine power production potentialities to <br />March )1, 1971. The second was a more detailed study covering coordi- <br />nated reservoir operations to estimate annual power production after <br />March 31, 1971. <br /> <br />. <br /> <br />The initial filling study was based on average streamflow condi- <br />tions for the 32-year period 1914-45. The average flow was progress- <br />ively modified throughout the filling period in accordance with the <br />projected achedule of upstream depletions. Allowances were made for <br />reservoir evaporation and for increases in storage at upetream reser- <br />voirs. Each reservoir was first filled to the minimum power operating <br />level in order that power generation might be obtained as early as <br />practicable. Thereafter additional storage was progressively accumu- <br />lated at all reservoirs from available storallle supplies. The filling <br />study indicates that Glen Canyon, the first reservoir scheduled for <br /> <br />18 <br />