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<br />.'. <br /> <br />'--,., <br /> <br />I. <br /> <br />) <br /> <br />J 4. Gary D. Weatherf ord & Gordon C. Jacoby, .. Jmpact of r:nergy Development on <br /> <br />the Law of the Colorado River," Natural Resources Journal, Vol. J5 <br /> <br />(1975), pp. 171, 183-85. The authors explain a study of tree ring <br />widths and reconstructed virgin flow data to develop estimates going <br /> <br />back to 1570. A Bureau of Reclamation estimate for the period 1900-73 <br /> <br />reported to be 14.9 million acre-feet a year. The progressive ten-year <br /> <br />running average peaked about the time the compact was signed. Since <br /> <br />J933 there has been only one year (1950) in which the ten-year proges- <br /> <br />sive running average flow at Lee ferry reached 15 million acre-feet. <br /> <br />Average annual virgin flow for the period 1922-82 has been 13.9 million <br /> <br />acre-feet. Upper Colorado River Commission" Thirty-fourth Annual Report <br /> <br />(Salt Lake City, Utah, J9a2), pp. 2J-27. <br /> <br />15. Simon H. Rifkind, ~ cit. p. 18. <br /> <br />lb. See Edward W. Clyde, "Institutional Response to Prolonged Drought." <br /> <br />i7. Several of the interpretive problems regarding inter-basin obligations <br /> <br />and rights are discussed elsewhere. Charles J. Meyers, ""The Colorado <br /> <br />River," Stanford Law Review, Vol. 19 (1966)', pp. I, 12-26; Edward W. <br /> <br />Clyde, "Conflicts between the Upper and Lower Basins on the Colorado <br /> <br />River," Resources Develoment: frontiers for Research (Boulder, Colo- <br /> <br />rado: University of Colorado Press, 1900), p. 113. <br /> <br />~ <br /> <br />18. Total consumptive water use from the Colorado River in the Upper Basin <br /> <br />was 3.5 million acre-feet in 198U. United States Department of the <br /> <br />- 34 - <br />