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<br />215:5
<br />
<br />Tobie 3
<br />
<br />CAPACITY AND SURFACE STORAGE OF MAJOR
<br />COLORADO RIVER BASIN RESERVOIRS
<br />(Thousands of Acre-feet)
<br />
<br />Uppu BaJill
<br />
<br />Lake PowelL _ _ _u, u_ _ _.
<br />Flaming Gorge__ _ __ _ u ___
<br />N.1vajo___~_ _ _ ___ _. __ -__
<br />Blue Mesa__ ___U___Ud
<br />FQntenelle___
<br />
<br />Cross
<br />Capacity
<br />27.000
<br />3,789
<br />1,709
<br />941
<br />H5
<br />
<br />Subtotal.
<br />
<br />.4aiv(
<br />SlOrab~ CJiui;gr
<br />UJab/r End of During
<br />Capacity Srpt, 196(i } 'tar
<br />25.002 6,423 - 43
<br />3,749 2,454 - 21
<br />1,514 314 - 236
<br />830 192 + 192
<br />145 H + 6
<br />
<br />33,784 3U60
<br />
<br />LOWtr BaJl"1
<br />Lake Mead_ _ _ 29,827
<br />Laker\"loha\'e_~__________ 1,818
<br />L.k, Ha..,""... 648
<br />
<br />SubtotaL __________ 32,293
<br />
<br />Total Both Basins- _ _ _ _ _ _ _ Mi,On
<br />
<br />9,427 - 102
<br />
<br />27,207 15,004 + 2%
<br />1,810 1,387 + 10
<br />619 565 + I5
<br />29,636 16,956 + 321
<br />61,096 26,31\3 + 219
<br />
<br />PLATE 4
<br />
<br />COLORADO RIVER BASIN RESERVOIRS
<br />STORAGE AND CAPACITY
<br />
<br />so
<br />
<br />.0
<br />
<br />so
<br />
<br />'0
<br />
<br />,01
<br />,r-'o
<br />
<br />o
<br />19JO
<br />
<br />
<br />--+
<br />
<br />S.,
<br />
<br />LAICE MEAD
<br />LAKE PO"'ELL
<br />FLAMING GORGE
<br />NAVAJO
<br />SLUE MESA
<br />FONTENELLE
<br />
<br />2.7.2
<br />
<br />ACTIVE CAPACITY
<br />
<br />LAKE MEAD STORAGE ONL'r'--
<br />
<br />
<br />)940
<br />WATER
<br />
<br />Ig~O
<br />YEAR
<br />
<br />1960
<br />
<br />1966
<br />
<br />Plate 4 shows the combined active surface
<br />storage of Lake Mead and the Colorado River
<br />
<br />22
<br />
<br />Storage Project reservoirs for the period 1935-
<br />1966. Lake Mohave and Lake Havasu are not
<br />included because they are operated at relatively
<br />constant levels. In addition to surface storage,
<br />water is absorbed in the areas adjacent to the
<br />reservoirs. At Lake Powell, this absorption or
<br />bank storage was esrimarco to be about 3, l 00,-
<br />000 acre-feet as of the end of water vear 1966,
<br />or 37 percent of the gross surface storage.
<br />As can be seen in Plate 4, the low runoff for
<br />1966 has delayed initial filling of major basin
<br />reservoirs to the combined rated head capacity.
<br />Plate 5 shows the changes in contents of the
<br />major mainstream reservoirs during the 1966
<br />water year.
<br />Article I1I(d) of the Colorado River Com-
<br />pact states that the States of the Upper Division
<br />will not cause the flow of the river at Lee
<br />Ferry to be depleted below an aggregate of
<br />75,000,000 acre-feet for any period of ten con-
<br />secutive years. In the past four years the filling
<br />of the Colorado River Storage Project reservoirs
<br />has resulted in a total flow at Lee F errv of onlY
<br />23,655,000 acre-feet as shown below: . .
<br />Fio'/,;,' at Lee Fern
<br />e A ere-Feet) .
<br />2,520,000
<br />2,427,000
<br />10,835,000
<br />7,873,000
<br />
<br />Wafer Year
<br />1962-63 .......... ,,""n"""''',,'''
<br />1963-64 ...................."""..."
<br />1964-65 ............"" """',"".,,'"
<br />1965-66
<br />
<br />Toral ...."".."".."" 23,655,000
<br />4-Year Average ...".. 5,914,000
<br />
<br />In the next six years it will be necessan' to
<br />release 51,345,000 'acre-feet at Lee Ferrv ,ir an
<br />average of 8,557,500 acre-feet a year i;l order
<br />that delivery will total 75,000,000 acre-feet for
<br />the 10-year period 1963-1972.
<br />
<br />Uses and Losses
<br />
<br />Depletions in the Upper Basin arc not all
<br />measured. The Bureau of Reclamation computes
<br />irrigation depletions by applying a unit rate to
<br />an estimated acreage. The unit rate is derived
<br />for each year by adjusting the estimated long-
<br />time average to vary with the annual runoff,
<br />indicating uses greater than average in years of
<br />high runoff and less than average in years of
<br />low runoff. This type of adjustment is ques-
<br />tionable for application to present development
<br />because of the increasing amount of storage reg-
<br />ulation available to supplement low runoff. In-
<br />
<br />.t~
<br />')
<br />
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