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, HYDROLOGIC BASE$ 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 passind the storage dams to downstream uses. This statement deals with the development of a working hypothesis em- ploying those assumptions and premises for short term application. Four main stora('e r'eservoirs are authorized by Public Law 485: Glen Canyon, Flammg ~orge, Curecanti, and Navajo. For simplifica- tion, storage at the latter three may be recognized by reflecting the effect of their operations upon streamflows at Glen Canyon, the last point of storage control in the upper Colorado River Basin. Under the assump1ji.on of average streamflow conditions, the premises of river regulqtion set forth herein would, if ultimately em- ployed, result in obtain;ing by 1970 initial storage and power head in the storage reservoirs, to be followed by long-time cyclical operation. The basic premises 1{0 be used in connection with development of the January 1, 1958, report to Congress follow: (1) Water to be passfd by the Glen Canyon Dam sufficient to meet downstream uses, exchjsive of power, with Lake Mead used only for the purpose of providi\1g seasonal regulation for water so passed at Glen Canyon. ; (2) Net flow differen?es between Glen Canyon Dam site and Hoover Dam should account for channel losses and inflows based on the period 1938-56, inclusive, for: present and future uses on tributaries, Lake Mead evaporation, ane;! present and future uses by pumping out of Lake Mead. . . (3) Water uses belot 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: ~ Acre-feet! ~a) Arizona_____________4-____________________________________- 1,225,000 ~~l ~~~~if~!~:::::::::::i::::::::::::::::::::::::::::::::::::: 5,3~~:ggg d) Mexico______________f_____________________________________ 1,762,000 e) Unaccounted-for wate~w_______-___-----__------------------- 508,000 1 Of the total face amount of the;Arlzona water contract of 2,800,000 aCl'e.fcet, this figure represents the estimate of usa by 1070, \ (4) POwer is to be generated at Hoover to, the extent that water required to meet down~tream uses, as defined in (3) above"will permit snch generation. If s\lch releases do not permit generation of firm power as defined by coutract, then Lake Mead storage would be drawn upon for firm power, el<cept that when Lake Mead storage is thereby drawn down to 17 milllon acre-feet (active), the accumulation of addi- tional storage in Glen; Canyon Reservoir shall be restricted to the extent necessary to p~mit continuance of firm power production at Hoover without furth~r demand upon Lake Mead storage. Water already stored in Glew, Canyon Reservoir shall not be released, how- ever, for continuance qf firm generation at Hoover. . I;