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<br />HYDROLOGIC ANALYSIS OF THE FLOOD <br /> <br />17 <br /> <br />TABLE 2.-Flood stages and discharges in Larimer County for the flood of July 15, 1982, and during previous maximum floods <br /> <br /> Distance Drainage Maximum floods previously known Flood of July 15, 1982 <br /> downstream ..... Prior to Ga.. Discbarge, HOW'. Gage Discharge <br /> "om m July 1982 befght, in cubic ID(Iuntaio height, in cubic <br /> Stream and Lawn Lake square m foot per daylight m feet per <br />Site Station place of dam, in miles Period Y,u foot _and time foot ,"""'" <br />number oom"'" determination miles <br />1 -------- Fall River above Cascade <br /> Lake 6.50 ----- ----- ----- '0740 7,210 <br /> dam above Estes Park. <br />2 -------- Fall River at Cascade Lake <br /> dam 6.67 ----- ----- ----- '0745 b4,500 <br /> above Estes Park. <br />3 -------- Fall River below Cascade <br /> Lake 7.68 ----- ----- '0800 13,100 <br /> dam above Estes Park. <br />4 -------- Fall River above Estes Park. 10.28 ----- ----- '0835 8,520 <br />5 06732500 Fall River at Estes Park. C 11.45 39.5 1947-53 1980 8,56 565 '0850 11.10 d6,550 <br /> 1978-81 <br />6 06733000 Big Thompson River at 12.50 137.0 1949-82 1949 '3.16 '1,660 '0905 5,500 <br /> Estes Park. <br />7 -------- Lake Estes at Estes Park. 12.75 ----- ----- ----- 0910 to '5,364 <br /> 0915 <br /> <br />IIApproximate time based on peak time in fignre 15, <br />bnischarge at time of dam failure; not the peak discharge. <br />cDestroyed by flood of July 15, 1982. <br />dEstimated from sites 4 and 6. <br />'Site and datum then in use. <br />fComputed by Bureau of Reclamation; discharge is average for 5-minute peak period. <br /> <br />20.000 <br /> <br /> <br />. <br /> <br />INDIRECT PEAK DISCHARGE <br />MEASUREMENT <br />MODEL RESULT <br />ADOPTED PEAK DISCHARGE <br />PROFILE <br /> <br />18.000 <br /> <br />. <br /> <br />Q <br />Z <br />0 <br />U <br />"' <br />VI <br />0: <br />"' <br />Q, <br />I- <br />"' 12,000 <br />"' <br />Q, <br />U <br />a; <br />:> 10,000 <br />u <br />i!: <br />W <br />'" 8000 <br />0: <br />.. <br />" <br />U <br />VI 8000 <br />15 <br />'" <br />.. <br />w <br />Q, 4000 <br /> 2000 Roaring Rluer <br /> 0 <br /> 0 2 3 <br /> <br />.. <br /> <br />~ <br />Horaeshoe <br />Park <br /> <br />. <br /> <br />. <br /> <br />) I' <br /> <br />Fa/IRJver <br /> <br />l I <br /> <br />Big Thompson River <br /> <br /> <br />5 6 7 8 9 10 11 12 <br />DISTANCE DOWNSTREAM FROM LAWN LAKE DAM, IN MILES <br /> <br />13 <br /> <br />14 <br /> <br />15 <br /> <br />16 <br /> <br />FIGURE l1.-PeaJNlischarge profile based on indirect peak-discharge measurements and model results. Indirect measurements <br />are believed to be more accurate than dam-break model results. <br />