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<br />. <br /> <br />0752 <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />runoff for the period April 19 through April 29 was 68j200 ad~e-feet <br /> <br /> <br />or equivalent to 1.61 inches over the d~ainage area. This volUme <br /> <br /> <br />exceeded the average annual flow at Trinidad as shown in table 10. <br /> <br /> <br />It is estimated that runoff during the higher intensity period was 70 <br /> <br /> <br />percent of the rainfall. Prior precipitation had saturated the drainage <br /> <br /> <br />area above Trinidad and loss rates during the storm were probably at a <br /> <br /> <br />minimum. This is indicated by a comparison of the precipitation, peak, <br /> <br /> <br />and volume with those of the 1904 flood. The precipitation at Trinidad <br /> <br /> <br />for the storm period in September 1904 and April 1942 was 5.95 inches <br /> <br /> <br />and 1.99 inches, respectively. During the 1904 storm about 4.8 inches <br /> <br /> <br />of rainfall occurred in one 24-hour period, while only 1.33 inches was <br /> <br /> <br />observed in a 24-hour peri.od during the 1942 storm. Comparative peak <br /> <br /> <br />discharges were 45,400 cubic feet per second and 35,000 cubic feet per <br /> <br /> <br />second for the 1904 and 1942 floods, respectively. Volumes of runoff <br /> <br /> <br />were estimated at 50,000 acre~feet from September 28 through October 2; <br /> <br /> <br />1904 and 68,200 acre-feet from Apr~l 19 through April 29, 1942. A re- <br /> <br /> <br />production of the runoff hydrograpil estimated by the State Engineer of <br /> <br /> <br />Colorado is shown on plate 3. <br /> <br /> <br />30. Flood of August 1950. - The August 2, 1950 flood, which is the <br /> <br /> <br />fourth in magnitude during the period of reliaole record at Trinidad, was <br /> <br /> <br />the result of a local thunderstorm that occurred between Trinidad and <br /> <br /> <br />the headwaters portion of the watershed. Rainfall intensity for the <br /> <br /> <br />storm is not known, but indications are that it must have been of severe <br /> <br /> <br />proportions over a small area. Only minor precipitation amounts were <br /> <br /> <br />recorded at the folloWing Weather Bureau stations for August 1 and 2, <br /> <br /> <br />respectively: North Lake, 0 and 0.30; Trinidad, T and T; Raton, <br /> <br /> <br />0.07 and 0.44; Raton AP, 0.20 and 0.24. The runoff from this storm <br /> <br /> <br />occurred in one day. The mean daily discharge on August 2 at the <br /> <br /> <br />Trinidad gaging station was 1,430 cubic feet per second and the <br /> <br /> <br />maximum peak discharge was 23,900 cuoic feet per second. The flood <br /> <br /> <br />hydro graph is shown on plate 3. <br /> <br />2; <br /> <br />APPENDIX B <br /> <br />, .1 ; ~",-,- <br /> <br />