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<br /> <br />5. Frequency Study, Auqust throuqh October Flows - Colorado River <br />at Lees Ferry - Colorado River Storage Project, December 15, <br />1961, by Orville B. Ridgely. <br /> <br />A frequency study of non-snowmelt season discharges was completed. <br />The study was performed using maximum 1-, 5-, 10-, 15-, and 20-day <br />discharges at Lees Ferry. It was based on August through October <br />flows for the 1921 through 1960 period. The analyses were used to <br />supplement the results for the snowmelt season found in the 1954 <br />study. The results are shown in table 1.8. <br /> <br />Table 1.8.--1961 flood frequency analysis for Glen Canyon Dam <br /> <br />Frequency Peak Maximum Volume (acre-feet) <br />(year) (ft3/S) 1-day 5-day 10-day 15-day 20-day <br />5 38,800 76,000 293,000 517,000 702,000 848,000 <br />lO 56,900 108,000 414,000 698,000 933,000 1,108,000 <br />25 81,700 157,000 603,000 960,000 1,250,000 1,465,000 <br /> <br />15 <br /> <br />