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26 RESULTS OF STUDIES of increosing the capacity of the reservoir cauld be charged to the increase in the available firm power which would result from the increase in reservoir capacity. The remaining cost of $11,900,000 therefore would have to be charged to the average annual 6,000 acre-feet of water that it is estimated would be made available by increasing the capacity of the reservoir to 80,000 acre-feet. This would result in a capital cost of increased water yield of about $2,000 per acre-foot. If Gross Reservoir were increased to its full originally con- templated capacity of 113,000 acre-feet, Study No, 14 disclosed that, in addition to equating all of the Moffat Tunnel water, 13,000 kilowatts of firm power could be generated, It is estimated that the cost of raising the reservoir to its originally contemplated capacity would be about $24,400,000, The capital cost of the increased water yield would approach $4,000 per acre-foot, Operation of Over-All Raw Water System There is depicted on Figures 4 and 5 the operation of the Denver water system under what has heretofore been termed the "minimum" facilities, Figure 4 indicates the operation of the system with no power generation at Gross Reservoir, and Figure 5 depicts the same operation except with the generation of 7000 kilowatts of power at Gross Reservoir, The period covered by the figures extends from October 1957 through September 1978 so far as requirements are concerned. The water supply is assumed as that which would be equivalent to that which histori- cally occurred for the period October 1933 through September 1954, The water supply was commenced in the year 1933 in order to start with five consecutive years of low water supply. The beginning storage af the South Platte reservoirs was assumed at 155,000 acre-feet, this being about what it was assumed would be in storage in October 1957 based on canditians existing at the time the studies were being made.