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<br />holidover storage capacity will be neededi when the useS' of water and deple tions
<br />of streamflows abcve Lee Ferry have reached the quantity heretoforo apportioned
<br />to the Upper Basin bJ' the Colorado River Com]1' ct. This is necessary to insure
<br />that flow3 at Lee Ferry will not be deplet.ed below an aggregate of 75,000.000
<br />acre feet foI" any period of ten consecutivll' years, such as 1931-191.:.0; and
<br />they should also be advised as to what the reservoir losses at that stage of
<br />development might total. Likewise, they should be informed that, when the
<br />16,270,000 acre feet of virgin flow at Lee Ferry has been depleted by
<br />7,500,000 acre feet, including upstream reservoir losses, the remaining flow'
<br />at Lee Ferry might be equated to a flow of 8.770,000 acre feet, provided
<br />that sufficient reservoir capacity b3 constructed and operated for holdover
<br />st:>,-age and streamflow regulation purp08Z;;j and they should be informed. as
<br />tn the possibilities for constructing the required reservoir capacities, as
<br />well as concerning the losses involved,
<br />
<br />f.,
<br />
<br />The Report indicates that any studies made in connection with these
<br />so-called potential reservoire appear to have been devoted to their assumed
<br />operations primarily for power purposes. The total power production at all
<br />the reservoirs will greatly exceed the needs for power in the naturaJl. drainage
<br />basin above Lee Ferry for forty years, according to the forecast contained
<br />in the Report. The Report proposes to market this surplus power, in ]1'rt,
<br />in areas outside the natural basin in Utah and Colorado (Which areas are not
<br />covered by the Report), but mainly in the Lower Basin market are~ where power
<br />deficienciea are anticipated in the near future.
<br />
<br />Colorado points out that projects, under construction and proposed in
<br />Colorado, for diverting waters of the Colorado River Syetem for irrigation
<br />use and for municipal and industrial purposes in the South Platte and
<br />Arkansas River valleY$ in eastern Colorado, _ being areas within the
<br />Colorado River Basin as defined in the Colorado River.Compact, _ will also
<br />produce' power sufficient in amount for the future needs of eastern Colorado
<br />for many decadelJ in the future, Hence the Report should not contemplate the
<br />marketing in eastern Colorado of surplus power produced at the reservoire
<br />under discussion,
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<br />6. Colorado River Water Suppliee Available in the United States.
<br />Conclusions of the Report, respecting the water supplies of the. Colorado
<br />River available in the United States, are based on the flow' of the Colorado
<br />River ~ the International Boundary, as calculnted fer sc-called virgi~
<br />conditions. Starting with the estimated vi~gin flow at Lee Ferry of
<br />16,270,000 acreNfeet annually. the aggregate combi.ned effect of all
<br />tributary inflows to the river section below' Lee Ferry (Including the Gila
<br />River), and of all natural consumption of water and channel losses
<br />incident to the conveyance of Colorado River water from Lee Ferry, and of
<br />Gila River water from the Phoeni~ vicinity, to the International Boundary,
<br />is estimated in the Report to have increased the virgin flow' at the
<br />International Boundary to an average of 17;720,000 acre feet annually.
<br />Allowing for a future flow'to Mexioo averaging 1,500,000 acre feet annually,
<br />as reqUired by Treaty, the Report concludes that the rell\il.ining 16,,220,000
<br />acre feet is the water supply of the Colorado River available for depletion
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