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<br />the stored water to be released rapidly, Third, the slope of the stream <br />(exceeding 20 percent on the Roaring River) and narrow channel limited attenu- <br />ation of the peak discharge. However, as discussed in "Dam-Break Modeling," <br />the flood could have had greater peak discharges with more damage for differ- <br />ent breach development and hydraul i c condi t ions, The flood occurred duri ng <br />daylight hours in clear weather, and with sufficient numbers of witnesses to <br />photograph and relate their experiences, good documentation of the flood was <br />made, The important hydrologic elements of a flood are peak discharges and <br />depths of flow, traveltimes, volumes, frequency, and flooded areas; these <br />elements are discussed in this section of the report. It is important to <br />document dam-break floods since limited information is available for assess- <br />ment and hazard mitigation of possible future dam-break floods, <br /> <br />Flood Data <br /> <br />Station Descriptions and Streamflow Data <br /> <br />Flood data obtained at two gaging stations and five miscellaneous sites <br />in the affected area are tabulated in downstream order in the section entitled <br />"Gaging Station and Miscellaneous-Site Data." Station descriptions give the <br />location of each site, the method of discharge determination, and peak dis- <br />charge or peak stage during the flood. Where available, information also is <br />given on gage datum, nature of gage-height records obtained during the flood, <br />and maximum stage and discharge known prior to this flood. <br /> <br /> <br />Figure 9A.--Water overtopping Cascade Lake dam. <br /> <br />16 <br />