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<br />Table 1. Historic Flood Peak Discharges and Stages at <br />Lyons Gage, St. Vrain Creek <br /> <br />Date <br /> <br />Stage <br />(Feet) <br /> <br />Maximum Discharge <br />(Cubic Feet per second) <br /> <br />o <br /> <br />July 30, 1919 <br />June 7, 1921 <br />June 14, 1924 <br />August 10, 1!l30 <br />May 27, 1935 <br />June 22, 1941 <br />July 18, 1946 <br />June 17, 1947 <br />June 4, 1949 <br />August 3, 1951 <br />May 9, 1957 <br />June 3, 1961 <br />August 30, 1967 <br />May 7, 1969 <br /> <br />7.90 <br />5.55 <br />5.00 <br />5.10 <br />5.50 <br />8.06 <br />4.32 <br />4.58 <br />4.95 <br />5.37 <br />5.97 <br />5.73 <br />5.80 <br />6.80 <br /> <br />9,400 <br />2,050 <br />2,230 <br />2,040 <br />2,340 <br />10,500 <br />2,140 <br />2,360 <br />2,970 <br />3,920 <br />3,060 <br />2,540 <br />2,010 <br />2,900 <br /> <br />This report is based upon data generated for the June 1972 and <br />September 1972 studies of Lower and Upper St. VrainCreek by the <br />U.S. Army Corps of Engineers (References 4 and 5, respectively). <br /> <br />" <br /> <br />The discharge-frequency relationships in the St. Vrain Creek basin <br />were based on a statistical analysis of the stream gaging records of <br />the St. Vrain Creek at Lyons. Synthetic unit hydro graphs were <br />developed for the St. Vrain Creek basin and its sub-drainage basins <br />of North St. Vrain Creek'and South St. Vrain Creek to help define <br />the flow characteristics within the basin. The hydro graphs were <br />used for stream routing through Button Rock Dam to Lyons and'down- <br />stream from Lyons to determine the discharges throughout the length <br />of the stream. ' <br /> <br />. <br />'0 <br /> <br />Peak discharge-drainage area relationships for St. Vrain Creek, <br />South St. Vrain Creek, and North St. Vrain Creek are shown in <br />Table 2. <br /> <br />, <br /> <br />c <br /> <br />9 <br />