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<br />Floods on Fountain Creek usually originate in storms <br /> <br /> <br />centered in the vicinity of Colorado Springs or downstream. Floods <br /> <br /> <br />that originate upstream of Colorado Springs generally dissipate to <br /> <br /> <br />negligible proportions prior to reaching Pueblo. <br /> <br /> <br />Plate 2 shows the crest stages and years of occurrence <br /> <br /> <br />of the highest ten recorded flows since 1921, including four which <br /> <br /> <br />axceeded the bankful stage of 9.4 feet at the 8th Street Bridge' <br /> <br /> <br />gaging station. <br /> <br />Duration and Rate of Rise <br /> <br />Duration of flooding data is not available for the <br /> <br /> <br />June 1965 flood on Fountain Creek, since all recording gages <br /> <br /> <br />were washed away. Streams draining mountainous and foothill <br /> <br /> <br />plains areas are characterized by fast rises after intense rainfall. <br /> <br />Veloci ties <br /> <br />The velocities in the channel of Fountain Creek in <br /> <br /> <br />the study reach are estimated to have ranged up to 22 feet per see- <br /> <br /> <br />ond (15 miles per hour), and overbank velocities are estimated to <br /> <br /> <br />have ranged up to 5 feet per second (4 miles per hour) during the <br /> <br /> <br />June 1955 flood. <br /> <br />Flooded Areas, Flood Profiles. and Cross Sections <br /> <br /> <br />Plates 4 through 9 show the approximate areas along <br /> <br /> <br />Fountain Creek that were inundated by the June 1965 flood, and those <br /> <br /> <br />which would be inundated by the Standard Project Flood and Interme- <br /> <br /> <br />diate Regional Flood. The actual limits of these overflow areaS on <br /> <br /> <br />the ground may vary slightly from those shown on the map because <br /> <br /> <br />the 10-foot contour interval and scale of the map do not permit <br /> <br /> <br />precise plotting of the flooded area boundaries. Accurate estimates <br /> <br /> <br />of water surface elevations, may be obtained from the high water pro- <br /> <br /> <br />file plates. <br /> <br />23 <br />