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<br />REPORT OF ENGINEERING COMMITTEE
<br />TO TIlE
<br />SUBCOMMITTEE OF SEVEN OF THE
<br />COMMITTEE OF FOURTEEN
<br />
<br />The Engineering Committee composed of R. J. Tipton of Colorado, Chas. F.
<br />DeAnnond of Nevada and M. J. Dowd of California met in El Paso, Texas on May
<br />27 and 28, 1942, and herewith submits its report to the Subcommittee of Seven.
<br />Also present were A. R. Arledge, Assistant Civil Engineer of the Bureau of
<br />Power and Light, City of Los Angeles and F. C. Merriell, Chief Engineer of the
<br />Colorado River Water Conservation District of Colcrado.
<br />
<br />Estimated Flow of Colorado River at International Boundary - 1950.
<br />
<br />Under 1950 conditions, it is estimated there will be available at the
<br />boundary, on the basis of an average year, a flow of betwe~n 3,000 and 4,000
<br />second feet during the surmner months and an annual flow of about 7,000,000
<br />recre feet. The latter may be reduoed to 4,000,000 aore feet in a series of
<br />dry years.
<br />
<br />Estimated Flow at Boundary with Full Possible Development in the United States,
<br />
<br />Under total development possible in the United States, assuming no treaty
<br />obligations to Mexioo, the only water which would reach the boundary would be
<br />a small amount passing Imperial Dam for regulating and control purposes and
<br />return flow to the river from adjacent lands irrigated below that point.
<br />
<br />Releases from Boulder Dam Under 1968 Conditions of Use in the Upper Basin.
<br />
<br />Available records and the best available estimates show, under 1988 con-
<br />ditions, consumptive use in the Upper Basin of 6,220,000 acre feet, and an
<br />average release from Boulder Dam over a 44 year period, such as 1897 to 1940,
<br />of 10,900,000 acre feet and a release during a series of dry years of about
<br />8,500,000 aore feet. By years there would be the following releases,
<br />
<br />Fqr 1 out of 44 years 8,500,000 acre feet
<br />II 43 II " " " over 8,500,000 II "
<br />" 33 " II II II " 9,000,000 II "
<br />II 28 II " " " " 9,500,000 II "
<br />" 24 " " " " II 10,000,000 " II
<br />II 15 II " II II II 11,000,000 " "
<br />
<br />It should be noted that the mean release stated above is based on a oon-
<br />sumptive use of 6,220,000 acre feet in the Upper Basin, Under the Compact,
<br />the Upper Basin is allocated 7,500,000 acre feet of consumptive use.
<br />
<br />Uses on Existing Projects in Lower Basin Under 1988 Conditions.
<br />
<br />It is estimated that in 1986, uses in the Lower Basin from the Main Stream,
<br />on present existing projeots below BQulder Dam, including river losses, will
<br />amount to 7,600,000 acre feet. These projects inolude an allowance for projeots
<br />in Nevada; the Palo Verde Irrigation District, All-American Canal, Metropolitan
<br />Water District of Southern California, City of San Diego and the Yuma Indian
<br />Reservation, in California; and, the Yuma Projeot, Mohave and Parker Indian
<br />Reservations, and the first unit of the Gila Project in Arizona.
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