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.' ,,1 - , 'J } Las Vegas, Nevada - 1215/57 (Revised Dec. 1957) APPENDIX "A" U. S. BUREAU OF RECLAMATION PROPOSAL October 24, 1957 (Revised) Hydrologic Bases for Financial Studies Colorado River Storage Project Public Law 485, Section 6, requires that certain financial data relative to the Colorado River Storage Project be reported to Congress on January 1 of each year commencing in 1958, Basic to such a report is the relationship of anticipated power revenues to the financial requirements of the Act. In turn, the anticipation of power revenues involves assumptions and premises as to future hydrologic conditions and as to water passing the storage dams to downstream uses. This statement deals with the development of a working hypothesis employing those assumptions and premises for short term application. Four main storage reservoir s are authorize6 by Public Law 485: Glen Can- yon, naming Gorge, Curecanti, and Navajo. For simphcation, storage at the latter three may be recognized by reflecting the effect of their operations upon stream flows at Glen Canyon, the last point of storage control in the Upper Colorado River Basin. Under the assumption of average streamflow conditions, the premises of river regulation set forth herein would, if ultimately employed, result in obtaining by 1970 initial storage and power head in the storage reservoirs, to be followed by long-time cyclical operation. The basic premises to be used in connection with development of the January 1, 1958, report to Congress follow; (1) Water to be passed by the Glen Canyon Dam sufficient to meet down- stream uses, exclusive of power, with Lake Mead used only for the pur- l/' pose of providing seasonal regulation for water so passed at Glen Canyon. (2) Net flow differences between Glen Canyon Dam site and Hoover Dam should account for channel losses and inflows based on the period 1938- 1956 inclusive, for present and future uses on tributaries, Lake Mead evaporation, and present and future uses by pumping out of Lake Mead. (3) Water uses below Hoover Dam, exclusive of power, should be those estimated to occur in the interim between 1958 and 1970. By 1970 they are assumed to consist of and be the sum of the following; (a) Arizona 1,225, 000 acre -feet* -' *Of the total face amount of the Arizona water contract of 2, 800, 000 acre-feet, this . figure represents the estimate of use by 1970. "" Refers to clarifications by Interior to "Hydrologic Bases" discussed in Washington October 24, 1957. -i-