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Paragraph 7 sets forth the method ~7hereby minimum power head (elevation 3,490) would be gained in Glen Canyon. The proposal here is to acquire this storage at the earliest practicable time. However, Lake Mead would not be drawn below the rated head of the Hoover powerplant while acquiring this storage in Glen Canyon. This is a significant point. If the rated head is maintained at Hoover, then only the energy generation at Hoover is affected and not the design capacity. Paragraph 8 sets forth the principle that the powerplants will be coordinated and integrated and states the general method whereby this will be accomplished. At this time it is not entirely clear whether the coordination and integration need be electrical in addition to hydrologic. Decisions on possible electrical intertie will need to be made later, following additional study. Only very general plans can be set forth in advance. To obtain the greatest practical amount of power and energy, the plants will have to be operated on an annual basis as conditions occur, and there must be therefore freedom to operate without being tied to a specific plan. The proposal for coordinated and integrated operation is deliberately tied to the provision for allowance. The corollary of a conclusion ; to provide an allowance for computed deficiency is that the Secretary exercises the discretion 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 conceivable of course that if a situation occurs where both res- ervoirs are completely full and there happens to be an extremely high runoff year, such that water would otherwise spill at Hoover, then secondary energy as defined in the Boulder Canyon project general regulations could be generated. Paragraph 10 indicates the cutoff date of the filling cri- teria, and permits earlier cutoff than given in paragraph 2 if such action is warranted. This is desirable because it will likely be possible to obtain full system firm power generation with less than a full Glen Canyon. As soon as this becomes a fact it would be well to close off the filling criteria. ~ ~ Paragraph 11 is a notification that the flood control regu- lations at Hoover Dam will be applied in full recognition of the available capacity in the upstream reservoir. The effect of such recognition is to diminish the space which must be held in Lake ~kad for the catchment of floods. Such action would of course influence cost allocations to be made under Sec. 6 of the Act of April 11, 1956. Results of the Proposal Analyses have been made to appraise the effect of applying these principles and criteria. Any such appraisal can, of course, only be indicative. However, the following results give some indi- cation of the magnitude of deficiencies in Hoover generation which 7