Laserfiche WebLink
<br />I <br />t <br /> <br />- 6 - <br /> <br />~ <br />, <br /> <br />Rains occur throughout the summer season. Rain prior to <br />mid-June does not increase the stream flow appreciably. <br />During this early period before peak snowmelt runoff there is <br />actually some reduction in the stream flow during periods of <br />precipitation. After the peak runoff has occurred and snow- <br />melt begins to decrease, rains tend to increase runoff. The <br />rains which occur in July and August have the greatest <br />potential for causing major flooding. Table 2 summarizes the <br />peak flows at the Blue River gage above Dillon for flows over <br />1000 cfs. <br /> <br />!. <br /> <br />Table 2 <br /> <br />i FLOOD PEAK STAGES AND DISCHARGES <br />~ BLUE RIVERl <br />I <br />, <br /> <br /> Date Discharge (cfs) Stage (ft. ) <br /> June 27, 1912 1,020 3.9 <br /> June 2, 1914 1,180 4.35 <br /> June 10, 1921 1,100 4.15 <br /> June 17, 1923 1,000 3.4 <br /> June 14, 1924 1,180 3.6 <br />, June 7, 1926 1,080 3.44 <br /> May 30, 1928 1,030 3.22 <br /> June 17, 1965 1,250 5.382 <br /> <br />1. Peak discharges in excess of lOOO cfs from U,S. <br />Geological Survey Water Supply Papers. <br /> <br />2. Gage relocated upstream in 1957 and tributary <br />drainage area reduced from l29 sq.mi. to ll9 <br />sq.mi. <br /> <br />The peak discharge recorded by the U.S. Geological Survey <br />on the Blue River near Dillon for the 64 years of record was <br />1250 cfs and occurred on June 17, 1965. The flow was a com- <br />bination of snowmelt and a high intensity thunderstorm or <br />cloudburst of small areal distribution centered in a tribu- <br />tary basin above the town. Plate 1 shows the hydrograph of <br /> <br />~ Leonard Rice Consulting Water Engineers, Inc. <br />