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<br />Table 5.--Discharge-Erequency summary Eor the Roaring River at mouth and <br />the Big Thompson River at Estes Park <br /> <br />Recur- <br />rence <br />i nter- <br />val <br /> <br />Discharge, in cubic feet per second <br /> <br />Roaring River at alluvial <br />(drainage area, <br />12.02 square miles) <br /> <br />a <br />fan <br /> <br />Big Thompson River at Estes Parkb <br />(drainage area, <br />137 square miles) <br /> <br />10 year <br />50 year <br />100 year <br />500 year <br />July 15, <br />1982 <br /> <br />205 <br />287 <br />317 <br />393 <br /> <br />1,540 <br />2,020 <br />2,200 <br />2,620 <br /> <br />5,500 <br /> <br />12,000 <br /> <br />~Based on regional regression equation (McCain and Jarrett, 1976), <br />Based on Log-Pearson Type III flood-frequency analysis (Interagency <br />Advisory Committee on Water Data, 1981), <br /> <br />6000 <br />5000 <br /> <br />1982 dam failures <br />Peak dischargo_ <br /> <br />4000 <br /> <br />o <br />z <br />8 3000 <br />w <br />"' <br />'" <br />w <br />"'- <br />tij 2000 <br />w <br />~ <br />u <br />in <br />:J <br />U <br />;;; <br />w' <br />~ 1000 <br /><( 900 <br />" <br />~ 800 <br />C 700 <br />600 <br /> <br /> <br /> <br />500 <br /> <br />10 25 <br /> <br /> <br />50 100 <br /> <br />600 <br /> <br />RECURRENCE INTERVAL, IN YEARS <br /> <br />Figure 13,--Flood-frequency curves station 06733000 Big Thompson <br />River at Estes Park 1951-77. Annual flood peaks have been <br />separated into rainfall and snowmelt floods, then recombined <br />with conditional probability into a composite flood-frequency <br />curve based on Log-Pearson Type III flood-frequency analysis <br />(Interagency Advisory Committee on Water Data, 1981). <br /> <br />28 <br />