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1379 . Maximum lake surface elevation at Twin Lakes was reached on July 1 at 9191.12 feet with a exmtent of 116,520 acre.ofeet. Mt. Elbert Forebay was at 9633.49 feet with a exmtent of 7,930: acre-feet. On September 30 the lake surface elevation of Twin Lakes was 9177.75 feet with 88,780 acre-feet of water. Mt. Elbert Forebay watE;lr surface elevation was at 9630.11 feet with a content of 7,090 acre-feet. Table 6 and Exhibit 4 srow Twin Lakes;'Mt. Elbert Forebay operation for water year 1981. Initial filling of the Mt. Ell:ert Forebay began November 17, 1980 and was filled on June 23, 1981, to 11,000 acre':'feet. This storage water was made available by releases fran Turquoise Lake through Mt. Elbert Conduit. The release fran Turquoise Lake oontinued on a flow through basis until July 13. To supplanent the flow-through water, and during times of testing prior to the fi11irr:l of the forebay, the pullping phase of the Mt. Elbert Punped-Storage ~rplant was tested and used to refill the forebay, maintaining sufficient head for generating. The flow-through water release fran Turquoise Lake began again on September 22 with the release of Fryingpan-)\.rkansas Project water l:eing delivered to Pueblo Reservoir. During water year 1981, 16,000 acre-feet of water was released fran Turquoise Lake through Mt. Elbert Conduit to Mt. Elbert Fo.rebay. E. Pueblo Reservoir Pueblo Reservoir's content on September 30, 1980, was 34,710 acre-feet. The Winter Water Storage Program 1I2S in effect fran November 15, 1980, to March 15, 1981, and I1l!Ide 49,750 acre-feet of water available fran Pueblo Reservoir for use by downstream users. By September 30 all but 1,200 acre-feet of the winter \\Ster had J::een released. Exhibit 5 shows the releases of winter water during 1I2ter year 1981. Pueblo Reservoir's content on September 30, 1981, ~s 32,970 acre-feet. ' Table 7 and Exhibit 6 srow Pueblo Reservoir operations during 1I2ter year 1981. . On August 6, 1981, a thunderstonn occurred during a 4-oour period over the reservoir resulting in a rise in water surface of ~ feet. This rise in water surface corresponds to an average inflow rate over the 4- oour period of 7,580 ft3/s. The mean daily inflow on August 6, 1981, was 2,065 ft3/s. An outflow rate durirr:l the day of the stonn was main- tained at 533 ft3/s to the Arkansas River ~11 l:elow the maximum safe channel capacity of 5,000 ft3/s. The U.S. Corps of Engineers estinate the' flood control l:enefits to l:e $111,000 as a result of the reservoir operations. Table 8 srows the flood l:enefits received since construc- tion of Pueblo Dilm. '~;'. . 12