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<br />Table 6,--Time of flooding from the failures of Lawn Lake dam and <br />Cascade Lake dam, July 15, 1982--Continued <br /> <br />Location and <br />distance <br />downstream <br />from Lawn Lake, <br />in miles <br /> <br />Time <br />(mountain <br />dayl ight <br />time) <br /> <br />Description <br />of occurrence <br /> <br />Downtown Estes <br />Park (1l.97) <br /> <br />0836 <br /> <br />Source <br /> <br />0843 <br /> <br />Big Thompson River 0846 <br />near powerplant <br />(12.75) <br /> <br />Lake Estes 0847 <br />(14.19) <br /> <br />"The main crest has just <br />come through town, it <br />should be on the east <br />side right now, The <br />water is still rising <br />a little bit. The <br />debris is starting to <br />hit the bridges." <br /> <br />Water going right through <br />center of town, <br /> <br />Rapidly rlslng water at <br />powerplant. <br /> <br />Lake begins to rise, <br /> <br />Larimer County <br />Sheriff's dispatch <br />tape. <br /> <br />Larimer County <br />Sheriff's dis- <br />patch tape. <br /> <br />Tape of KSIR radio <br />broadcast. <br /> <br />South Platte River <br />Project Offi ce <br />(U,S. Bureau of <br />Reclamation). <br /> <br />DESCRIPTION OF FLOOD-WAVE CHARACTERISTICS <br /> <br />Specific details of the flood wave are of interest in understanding flow <br />hydraulics, Understanding of flood-wave characteristics is important as they <br />are the major cause of property damages, geomorphic changes, and are a factor <br />in implementing flood warnings. Flood-wave characteristics varied along the <br />flood path; therefore, they are di scussed by vari ous segments where charac- <br />teristics are fairly uniform for that segment, Channel slope is the dominant <br />factor in establishing these segments (fig. 2.) <br /> <br />Roaring River: Lawn Lake Dam to Horseshoe Fall s <br /> <br />As discussed in the early section of this report, "The Setting," the <br />Roaring River is a small, high-gradient stream (fig. 2). A photograph of the <br />mouth of the Roaring River prior to the flood taken in 1978, showing the <br />small, heavily vegetated, high-gradient channel, is shown in figure 16A. The <br />Roaring River streamflow prior to the flood probably ranged from 25 to <br />50 ft3/s. A photograph taken after the flood at the same location is shown in <br />figure 16B, The sudden breach of Lawn Lake dam resulted in a flood wave with <br /> <br />36 <br />