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<br />physical faaturas of the watershed can produce the rapid concen- <br /> <br /> <br />tration of runoff that characterizes flash floods of high peak <br /> <br /> <br />flows, small volumes, and short durations. <br /> <br />* <br /> <br />* <br /> <br />* <br /> <br />VELOCITIES OF WATER during the Standard Project Flood would <br /> <br /> <br />range up to about 26 feet per second (18 miles per hour) in the <br /> <br /> <br />main channel of the creek. Velocities outside of the main channel <br /> <br /> <br />vary widely, depending upon location, but would reach about g feet <br /> <br />per second (8 miles per hour) in some areas. These high velocities <br /> <br /> <br />during a major flood would be extremely dangerous to life and <br /> <br /> <br />property. Velocities greater than 3 feet per second combined with <br /> <br /> <br />depths of 3 feet or more are generally considered hazardous even <br /> <br /> <br />to adults. <br /> <br />* <br /> <br />* <br /> <br />* <br /> <br />DURATION OF FLOODS on Fountain Creek is relatively short as <br /> <br /> <br />compared to those on the Arkansas River at Pueblo. For the Inter- <br /> <br /> <br />mediate Regional Flood, duration above bankfull stage would be <br /> <br /> <br />about 9 and 10 hours, respectively, in the upper and lower reaches <br /> <br />of Fountain Creek. During the Intermediate Regional Flood, the <br /> <br /> <br />creek would rise over 9 feet in S hours with a maximum rate of rise <br /> <br /> <br />of about 204 feet per hour in the upper reach. Similarly, the rise <br /> <br /> <br />would be more than 10 feet in 5.3 hours with a maximum of about <br /> <br /> <br />2.4 feet per hour in the lower reach. The duration of the Standard <br /> <br /> <br />Project Flood would be about 19 and 20 hours, respectively, in the <br /> <br /> <br />upper and lower reaches of Fountain Creek. During the Standard <br /> <br /> <br />Project Flood, the stream would rise over 17 feet in 8 hours with <br /> <br /> <br />a maximum rate of rise of about 2.9 feet per hour in the upper <br /> <br /> <br />reach. The rise would be about 18 feet in 8.7 hours in the lower <br /> <br /> <br />reach with a maximum rate of about 2.9 feet per hour. <br /> <br />* <br /> <br />* <br /> <br />* <br /> <br />FLOOD DAMAGE PREVENTION MEASURES by local interests consist of <br />improvements in the Fountain Creek channel whereby it can now <br />carry approximately the 1965 flood of 47,000 cubic feet per second <br />from the 8th Street Bridge to below the 4th Street Bridge. <br /> <br />3 <br />