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<br />OOltfH
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<br />River Basin.
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<br />24. The "virgin flow" at Lee ?erry shom in the Report is 16,271,000
<br />acre feet (UlIlually. Colorado notes thDt, ns previously oaloulated by the
<br />Bureau of Reclame.tion for each year of the period 1897-1943, the virgin
<br />flow at Lee Ferry averaged 16,223,000 acre feet annually, and for the per-
<br />iod 1908-1942 (employed by Colorado engineers) averaged 16,l.J.II,000 acre
<br />feet annually. Independent estimates by Colorado engineers, based on re-
<br />corded flows at Leej,'erry averaging 14,308,000 acre 1'eet annually, and
<br />upstrelUll "depletions" averaging 1,952,000 acre feet annually during the
<br />period, indicate a comparable figure for "virgin flow" at Lee i;<erry 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 aore feet calculated by Colorado engineers, is so minor in
<br />amount that it may properly be disregarded.
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<br />25. The Report fails to prosent data concerning "virgin flows" at
<br />Boulder Dam, and at the Inte['national Boundary. As estimated by Colo-
<br />rado engineers, for the river section between Lee Fer['y and Boulder Dam.
<br />under virgin conditions, the tributary inflows averaged 1,300,000 acre
<br />feet and the natural losses averaged 130,000 ncre feet, indicating a net
<br />gain of 1,170,000 acre feet, which, added to the virgin flow at Lee Ferry
<br />of 16,260,000 acre feet, gives a virgin flow at Boulder DlUIl of 17,430,000
<br />acre feet annually; and for the r'iver section between Boulder Dam and
<br />Laguna Dam, the tributary inflows averaged 200,000 acre feet and natural
<br />losses averaged 1,070,000 acre feet, indicating a net loss of 870,000
<br />acre feet, end a virgin flow at lnguna Dam of 16,560,000 acre feet annual-
<br />ly, - as compared with the figure 01' 16,451,000 aCl'e 1'eet shom in the Re-
<br />port. Virgin flows at the International Boundary, as calculated by Colo-
<br />rado engineers, averaged 18,000,000 acre feet annually, - as compared \vith
<br />the figure of 17,722,000 acre feet wch 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," ineludes discussions
<br />of explorations, settlement, and ec.rly development of the ri vel' for irri-
<br />gation, flood c ontro I, power and other pur pas es, and a summary of condi-
<br />tions in the early 1920's. At page 27 a table is presented entitled,
<br />"Irdgation Development in the Colorado River Basin in 1922," which pur-
<br />ports to show the irrigated and irrigable acres in the Upper Region and
<br />in the Lower Region, inc luding acreages in Nexico. Colorado points out
<br />that the term "Colorado River Basin," as de1'ined by Art. II (b) of the
<br />Colorado River Compact is limited to "territory within the United 3tates
<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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