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<br />OOil4U1
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<br />River Basin.
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<br />24. The "virgin flow" at Lee ?erry shov.n in the Report is 16,271,000
<br />acre feet !UUlually. Colorado notes that, P.S previously ca.lculated by the
<br />Burea.u of Reclamation for each year of the period 1891-1943, the virgin
<br />flow at Lee Perry averaged 16,223,000 acre feet amually, and for the per-
<br />iod 1908~1942 (employed by Colorado engineers) averaged 16,441,000 acre
<br />feet annually. Independent estimates by Colorado engineers, based on re-
<br />corded flows at Lee Jerry aver~~ing 14,308,000 acre feet annually, and
<br />upstream IIdepletions" averaging 1,952,000 acre feet annually during the
<br />period, indicate a comparable figure for IIvirgin flow" at Lee ;Oerry of
<br />16,260,000 aore 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 calculated by Colorado engineers, is so minor in
<br />amount that it may properly be disreg~rded.
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<br />25. The Report fails to present data eonoerll~ng "virgin flows" a.t
<br />Boulder Dam, and at the International Boundary. As estimated by Colo-
<br />rado engineers, for the river seotion between Lee Ferry and Boulder Dam,
<br />under virgin conditions, the tributary inflows averaged 1.300,000 acre
<br />feet and the natural losses averaged 130,000 acre feet, indicating a net
<br />gain of 1,170,000 acr~ feet, which. added to the virgin flow at Lee Ferry
<br />of 16,260,000 aore feet, gives a virgin flow at Boulder Dam of 17,430,000
<br />acre feet annually; and for the river seotion between Boulder Dam and
<br />IaGuna Dam, the tributary inflows averaged 200,000 acre feet and natural
<br />losses averaged 1,070,000 aore feet, indicating a net loss of 870,000
<br />acre feet, and a. virgin flow at IAguna Dam of 16,560,000 aore feet annual-
<br />ly, - as compared with the figure of 16,451,000 acre feet shov.n in the Re-
<br />port. Virgin flows at the International Boundary, as oalculated by Colo.
<br />rado engineers, averaged 18,000.000 aore feet annually, . as compared with
<br />the figure of 17,722,000 acre feet which might be derived from the Report
<br />by adding the 16,451,000 at laguna Dam to the 1,271,000 Gila River at
<br />Dome. Here, too, the results are in substantial agreement.
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<br />26. Chapter II entitled, "Claiming the Basin," includes discussions
<br />of explorations, settlement, and er.rly development of the ri ver for irri-
<br />gation, flood control, power and other purJ:X>ses. and a sllllVllary of condi-
<br />tions in the early 1920's. At page 27 a table is presented entitled,
<br />"Irrigation Development in the Colorado River Basin in 1922," which pur-
<br />ports to show the irrigated and irrigable acres in the Upper Region a.nd
<br />in the Lower Region, including acreages in Mexioo. Colorado points out
<br />that the term "Colorado River Basin, n as defined by Art. II (b) of the
<br />Colorado River Compact is limited to "territory within the United 5tates
<br />of America;" and suggests that in lieu of said table the following tabu-
<br />lation be substituted, being information compiled from reports of the
<br />United States Bureau of the Census. as follOWS'
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