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<br />" <br /> <br />, <br />... <br /> <br />o <br />....:J <br />~ <br />c.r.: <br /> <br />13 <br /> <br />Flood Control <br /> <br />The capacity at which general flooding begins for the <br /> <br />Purgatoire River at Trinidad and vicinity is estimated to <br /> <br />be 15,000 cfs. <br /> <br />Flood reports indicate that damage from <br /> <br />bank caving begins at about 5,000 cfs. The largest flood <br />of record, that of September 30, 1904, had a peak dis- <br />charge of 45,500 cfs. at Trinidad as estimated by the U.S. <br />Geological Survey. Floods occurred in 1866 and 1883 and <br />1886 with peak discharges of from 25,000 cfs to more than <br />30,000 cfs, as nearly as can be presently determined. The <br />second largest flood of record occurred on April 23, 1942, <br />with an estimated peak discharge at Trinidad of 35,000 cfs. <br />During the period of continuous record, 1921-1950, eight <br />floods have exceeded the channel capacity of 15,000 cfs. <br />It is estimated that with the Trinidad reservoir in <br /> <br />operation the peak discharges for seven of the floods <br />would have been reduced to about 5,000 cfs. and for the <br />1904 and 1942 peaks the reduction would have been to <br />10,000 cfs. and 8,000 cfs. respectively. <br />The design flood derived for Trinidad dam site would <br />have an estimated peak discharge of 99,000 cfs. and a <br />volume of 57,900 acre feet. The peak discharge from the <br />intervening area between Trinidad and the dam site is <br /> <br />estimated to be 28,000 cfs. The storage capacities required <br />