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<br /> 20,0.00 <br /> 18,000 <br />0 16,000 <br />z <br />0 <br />u <br />w <br />V> 14,000 <br />'" <br />w <br />0- <br />f- <br />w 12,000 <br />w <br />~ <br />u <br />in <br />=> 10,000 <br />u <br />;!: <br />w- <br />" 8000 <br />'" <br />., <br />1: <br />U <br />V> 6000 <br />0 <br />>< <br />., <br />W <br />0- 4000 <br /> 2000 <br /> 0 <br /> 0 <br /> <br /> <br /> <br />. INDIRECT PEAK DISCHARGE <br />MEASUREMENT <br />MODEL RESULT <br />ADOPTED PEAK DISCHARGE <br />PROFILE <br /> <br /> <br /> <br />'. <br /> <br /><0 <br />W <br />f- <br />u; <br /> <br />~ <br />Horseshoe <br />Park <br /> <br />Roaring River <br /> <br />, I- <br /> <br />Fa/! River <br /> <br />~! Big Thompson Rluer <br /> <br /> <br />2 <br /> <br />4 <br /> <br />13 <br /> <br />3 <br /> <br />7 <br /> <br />8 <br /> <br />9 <br /> <br />15 <br /> <br />16 <br /> <br />5 <br /> <br />6 <br /> <br />12 <br /> <br />14 <br /> <br />10 <br /> <br />11 <br /> <br />DISTANCE DOWNSTREAM FROM LAWN LAKE DAM, IN MILES <br /> <br />Figure ll,--Peak-discharge profile based on indirect peak- <br />discharge measurements and model results, Indirect <br />measurements are believed to be more accurate than dam- <br />break model results, <br /> <br />capacity of Cascade Lake, Because of the need for storage-capacity data, land <br />surveys were combined with aerial-photographic mapping techniques to determine <br />pertinent preflood and maximum-flood water-surface levels, develop topographic <br />maps, and determi ne storage-capaci ty data of both 1 akes, These topographi c <br />maps are shown on plates 1 and 2 in the pocket at the back of the reporL <br />Storage-capacity data and other pertinent information for the two lakes are <br />shown in table 3_ <br /> <br />The vertical datum for the Lawn Lake topographic maps was approximated <br />from an existing U,S, Geological Survey 7~-min quadrangle map, as the site was <br />so remote from any available accurate vertical controL These surveys indi- <br />cated that the failure of Lawn Lake dam released 674 acre-ft of water on July <br />15, 1982_ As indicated in figure 12, a substantial amount of water remained <br />as dead capacity, and almost corresponding to the original moraine-dammed <br />mountain lake, Although the lake level at the time of failure was 1 ft deep <br />in the overflow spillway, the water released was considerably less than <br />previously believed to have been stored behind the dam (Office of the State <br /> <br />23 <br />