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18 <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 2,221 11609,100 435 11,391 (May 28) <br />1941-83 2,048 1,483,700 367 9,597 (May 30) <br />1922-83 2,082 1,508,400 384 9,892 (May 29) <br />Table II. Flood Frequency Analysis <br />Return Period <br />(years) <br /> <br />Gumbel Discharge (cfs) <br /> <br />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 <br />x 29,220 22,240 <br />500 32,200 <br />1000 341,460 23,240 <br />r ,