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20 <br />Table I Historical Flow at Deerlodge Park <br />Mean Mean <br />Mean Annual Annual Base Flow Annual <br />Period Discharge Flow Sept 1 - Feb 28 Peak <br />(cfs) (acre-feet) . (cfs) (cfs) <br />1922-38 <br />1941-83 <br />1922-83 2,221 <br />2,048 <br />2,082 1,609,100 <br />1,483,700 <br />1,508,400 435 <br />367 <br />384 11`,391 <br />9,597 <br />9,892 (May <br />(May <br />(May 28) <br />30) <br />29) <br /> <br />Table II. Flood Frequency Analysis <br />Return Period Discharge (cfs) <br />(years) <br />Gumbel log-Pearson type III <br />1.01 12,000 <br />1.05 12,120 <br />1.10 12,270 <br />1.25 12,690 <br />1.5 13,280 <br />2 14,220 14,070 <br />5 17,200 17,710 <br />10 19,460 19,270 <br />20 21,720 20,170 <br />25 22,450 20,630 <br />50 24,700 21,340 <br />100 26,960 21,850 <br />200 29,220 22,240 <br />500 32,200 <br />1000 341460 23,240