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<br />
<br />........\.1
<br />
<br />River Basin.
<br />
<br />24. The "virgin flow" at Lee Ferry shown in the Report is 16,271,000
<br />acre feet e.nnually. ,Colorado notes that, as previously oalculated by the
<br />Bureau of Reolamation for each year of the period l897~1943~ the virgin
<br />1'10.... at Lee Ferry averaged 16,22.3,000 aore feet annually, and for the per-
<br />iod 1908~1942 (employed by Colorado engineers) averaged 16,L4l,ooO aore
<br />feet annually. Independent estimateII' by Colorado engineers, based on re-
<br />corded flOws at Lee Ferry averaging 14,,308,000 acre feet annually, and
<br />upstream "depletions" averaging 1.952.000 aore feet annually during the
<br />period, indicate a oomparable figure for "virgin flow" at Lee Ferry of
<br />16,260,000 acre feet annually. The difference between the figure of
<br />16,271,000 acre feet shown in the Report, and the comparable figure of
<br />16,260,000 acre feet oaloulated by Colorado engineers, is so minor in
<br />amount that it may properly be disregarded.
<br />
<br />25. The Report fails to present data oonoerning "virgin flows" at
<br />Boulder Dam, and at the International Boundary. As eetimated by Colo-
<br />rado engineers, for the river seotion between Lee Ferry and Boulder Dam,
<br />u.nder virgin oonditions, the tributary infioYfll averaged 1,.300,000 aore
<br />fe.et 'and the natural losses averaged ,1,30,000 acre feet, indioating a net
<br />gain of 1,170,000 aore feet, whioh, added to the virgin flow at Lee Ferry
<br />of 16,260,000 aore feet, gives a virgin fl~ at Boulder Dam of 17,4.30,000
<br />aore feet annually; and for the river seotion between Boulder Dam e.nd
<br />, Laguna Dam, the tributary intlO1'fIf aver'aged 200 ,000 acre feet andnaturit.l
<br />losses averaged 1,070,000 aore feet, indioating a net loss of 870;000
<br />aore feet, and a virgin floW' at Laguna Dam of 16,560,000 ll.Cre feet annual-
<br />ly, - alE compared with the figure of 16,451,000 aore feet shOMl in the' Re-
<br />port. Virgin flows- at the International Boundary, as oaloulated by Colo-
<br />.rado engineers, averaged 18,000,000 aore feet annually, - as oompared with
<br />the figure of 17, 722~OOO aere feet "hieh might ve derived' from the Report
<br />, by adding the 16,h,1.OOO at Laguna D~ to the 1,271,000 Gila River at
<br />Dcme. Here, too, the results are in substantial agreement.
<br />
<br />26. Chapter II entitled, "Claiming the, Basi,l!.,.. inollldes ,disoussions
<br />of explorations, settlements and early development of the river for irri-
<br />gation,' flood oontrol, power- and other purposes, and a eummary of condi-
<br />tione in the early 1920's. At page Z1 a table is presented entitled,
<br />"Irrigation Development in the Colorado River Basin in 1922," tlhioh pur-
<br />ports to shOl'f,the irrigated and irrigabJ.e aores in the Upper Region and
<br />in the Lovoer Region, inoluding aoreages in Mexioo. Colorado points out
<br />that the term "Colorado River Basin," as defined by Art. II (b) of the
<br />Colorado River Compact is limited to "territory within the United States
<br />of Amerioa;" and suggests that in lieu of' 8llid table the following tabu-
<br />lati on be substituted, being informati on oompiled frCJll reports of the
<br />United States Bureau of the Censu.., alF follows: '
<br />
<br />
<br />
<br />
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