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<br />Frequency <br /> <br /> <br />It is impractical to assign a frequency to the Standard <br /> <br /> <br />Project Flood. The occurrence of such a flood would be a rare <br /> <br /> <br />event; however, it could occur in any year. <br /> <br />Possible Laroer Floods <br /> <br /> <br />Floods larger than the Standard Project Flood are <br /> <br /> <br />possible; however, the combination of factors necessary to produce <br /> <br /> <br />such floods would seldom occur. The consideration of floods of <br /> <br /> <br />this magnitude is more important in some areas than in others, but <br /> <br /> <br />they should be considered in any study. <br /> <br />Hazards of Great Floods <br /> <br /> <br />The amount and extent of damage caused by any flood <br /> <br /> <br />depends in general upon how much area is flooded, the height of <br /> <br /> <br />flooding, the velocity of flow, the rate of rise, and the duration <br /> <br /> <br />of flooding. <br /> <br />Areas Flooded and Heiqhts of Floodino <br /> <br /> <br />The areas along Fountain Creek flooded by the Standard <br /> <br /> <br />Project Flood and the Intermediate Regional Flood are shown on <br /> <br /> <br />Plates 4 through 9. Depths of flow can be estimated from the water <br /> <br /> <br />surface profiles shown on Plates 10 through 15. <br /> <br /> <br />The profiles for the streams were computed by using <br /> <br /> <br />stream characteristics, topographic maps, and valley cross sections <br /> <br />which were surveyed in August 1957. The elevations shown on Plates <br /> <br /> <br />10 through 15 and the overflow areas shown on Plates 4 through 9 <br /> <br /> <br />have been determined with an accuracy consistent with the purposes <br /> <br /> <br />of this study and the accuracy of the basic data. <br /> <br /> <br />The profiles of the Standard Project Flood and the <br /> <br /> <br />Intermediate Regional Flood depend in part upon the degree of <br /> <br /> <br />structural obstruction and clogging that may occur at the various <br /> <br /> <br />bridges during the flood. Because these factors cannot be accurately <br /> <br />36 <br />