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<br />. <br /> <br />, <br /> <br />, <br /> <br />, <br /> <br />. <br />014!) <br /> <br />and instability precipitation. During the strong flow of moist unstable <br /> <br />air into the area, a large cold trough persisted over the Rocky Mountains. <br /> <br />As the anticyclone moved eastward, a cold front passed over the <br /> <br />Purgatoire Basin producing precipitation of high intensity which caused <br /> <br />rapid runoff resulting in a large magnitude flood. <br /> <br />22. Historical floods. ~ Historical records indicate the comparative <br /> <br />magnitude of the major floods which occurred in the drainage area above <br /> <br />Trinidad as early as 1866. Available data indicate that prior to the <br /> <br />establishment of gages, or during periods when the gage readings of the <br /> <br />crest stages were not obtained, large magnitude floods occurred at Trinidad <br /> <br />in November 1866, the summer of 1883, and July 1886. Descriptions of <br /> <br />historic floods are published in U.S. Geological Survey Water-Supply Papers <br />Nos. lLr7, 487, and 997. These floods are discussed in the following <br /> <br />paragraphs. <br />23. Flood of 1866. - Data are meager concerning the flood of 1866, <br /> <br />and there is no mention of its occurrence other than at Trinidad. The <br /> <br />following account of the flood of 1866 is given in the U. S. Geological <br /> <br />Survey Ivater-Supply Paper No. 147, page 163, 1905: <br /> <br />A flood occurred in Trinidad in November 1866, <br />and since that time there have been two large floods at <br />this place, the exact dates and volume of discharge of <br />which could not be secured. Old residents agree that the <br />flood of September 1904, was considerably larger than any <br />previous one. <br /> <br />Flood data obtained indicated that the peak discharge of the November 1866 <br /> <br />flood probably exceeded 30,000 cubic feet per second. <br />24. Flood of 1883. - There is no account of the flood of 1883 at <br /> <br />places in the basin other than at Trinidad. On a water ,vorks building <br /> <br />erected near the river in 1879, "83" is cut in the stone door frame. <br /> <br />The 1883 mark is 14 inches below the 1904 mark. It is, therefore, probable <br /> <br />that the 1883 flood exceeded. a discharge'of 30,000 cubic feet per second. <br /> <br />22 <br /> <br />APPENDIX B <br /> <br />.~ -. <br /> <br />, <br /> <br />