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32 CqLORADO RIVER STORAGE PROJEOT prOVISIOn for t111owance. The eorollary of a eonelusion to provide an allowance for 40mputed defieiency is that the Seeretary exercises the diseretion to operate in a reasonable manner as he determines. Paragraph 9. The decision to coordinate and integrate necessarily eliminates secondary. energy generation at Hoover. It is eoneeivable, of course, that if;a situation occurs where both reservoirs - aTe com~ pletely full and there happens to be .tll extremely high runoff. year, such that water would otherwise spill at Hoover, then seeondary energy as defined ,in the Boulder Oanyon project general regulations could be generated. . Paragraph 10. i!Jdieates the eutoff date of the filling eriteria, and permits earlier cljtoff than given in paragmph 2 if such aetion is warranted. This 'is desirable beeause it will likely be possible to ob- tain full system firm power generation with less than a full Glen Oanyon. As SOOll as this beeomes a faet it would be well to close off the filling criteria.' Paragraph 11 is a notification that the flood eontrol regulations at Hoover .Dt1In will be applied in full recognition of the available capae- ity in the upstream reserv.oir. 'l'he effeet of such reeognition is to diminish the spaee whieh must be held in Lake Mead for the eatch- ment of floods. Sueh aetion would, of course, influence eost alloea. tions to be made ander seetion 6 of the act of April 11 , 1956. RESULTS OF THE PROPOSAL Analyses have becn made to appraise the effeet of applying these prineiplesand criteria. Any sueh appraisal ean, of eOUl'se, only be indicative. However, the following results give some indieation of the magnitude of defieieneies in Hoover generation whieh might oceur. If it is assumed that a runoff sequenee, such as httppened in 1930 through 1952 (eonilidered to be an adverse period) should recur start- ing in 1962, and iallowing for increllses in upstream depletions, it appears that over that 23-year period the amount of deficiency would be 9,566 million kilowatt-hours, or an average of 415 million kilowatt- hours per year. This is roughly 10 percent of the average Hoover firm energy for th~ same period. If we assume that runoff eonditions sueh as oecurred from 1922 to 1929, inelusive (eonsidered to be a favorable period), 'oceurred in the same sequence, there would be no deficieney in the 8.year period required to fill Glen Oanyon Reservoir. If we assume ti)'at the sequenee stttrting in 1942 and continuing through 1957 followed 'by it reeurrenee of 1922 through 1924 reeurred, there would have been It deficieney in 12 of tho 19 years, with the total deficiency being a~out 8 percent of the total Hoover firm. 'I'he periQ.d of y~ars which might be involved in filling Glen Oanyon under the proposal beeomes of lesser significance when the reservoirs are coordinated ant! integrated for power produetion, as the objective then is maximum 'power produetion ttnd not reservoir filling per se. 'I'he study made does show Glen Canyon filling in 23 years under the 1930 sequenee, 19 .years under the 1942 sequeneei and 8 years under the 1922 sequenee. The repayment. studies for the upper basin projeet assume that thrnughout the Mriod of "Glen Oanyon filling" (1) there will be average runoff, and (2) firm generation at Hoover will be mttintained to the oxtent it ean be without (a) drawing Hoover below 17 million acre-feet, and (b) Without drawing upon Glen Oanyon storage for that .