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Last modified
11/23/2009 12:57:58 PM
Creation date
10/4/2006 10:35:37 PM
Metadata
Fields
Template:
Floodplain Documents
County
Larimer
Community
Larimer County
Stream Name
Lawn Lake Dam
Title
Hydrology, Geomorphology, and Dam-Break Modelling of the July 15, 1982 Lawn Lake Dam and Cascade Lake Dam Failures
Date
1/1/1983
Prepared For
State of Colorado
Prepared By
USGS
Floodplain - Doc Type
Flood Documentation Report
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<br /> 15,000 <br /> 1982 dam failure <br />Q Peak discharge <br />z <br />Q 10,000 <br />u <br />w <br />"' <br />'" <br />w <br />~ <br />f- <br />w <br />w <br />~ 500 <br />u <br />iC <br />" <br />u <br />i!: 400 <br />w' <br />'" <br />'" <br />" <br />:E: 300 <br />u <br />"' <br />Ci <br /> <br /> <br />25 <br /> <br />50 100 <br /> <br />500 <br /> <br />RECURRENCE INTERVAL, IN YEARS <br /> <br />Figure 14,--Regional flood-frequency curve for Roaring River <br />at Horseshoe Falls, based on regional regression equation <br />of McCain and Jarrett (1976), <br /> <br />two dam failures in Rocky Mountain National Park are not unprecedented; <br />similar conclusions were reached following the failure of Hell Hole dam on the <br />Rubicon River, CaliL, in 1964 ($cott and Gravlee, 1968). Floods of such <br />magnitude from dam failures would be expected to accomplish an enormous amount <br />of geomorphic work, and to cause great modifications to the channels and <br />valleys below the dams (as described in "Geomorphic Effects of the Flood"). <br /> <br />Trave It i me <br /> <br />Immediately after the flood, personnel of the U,$, Bureau of Reclamation <br />interviewed residents along the flood path and compiled written statements to <br />eva 1 uate the di ssemi nat i on of and response to the fl ood warni ngs, Thi s <br />information, in conjunction with streamflow-gaging station, Lake Estes inflow, <br />and stream mileage data, provided data to compute the traveltime of the flood <br />wave. <br /> <br />Apparently no one observed the failure of Lawn Lake dam, and the time of <br />failure is uncertain, Campers at Lawn Lake reported hearing a roar between <br />0200 MDT and 0400 MDT, which probably corresponded to increased flows through <br />a partial failure. The amount of water probably was quite small (perhaps less <br />than 100 ft3 /s), because campers along the Roari ng Ri ver were not affected. <br /> <br />30 <br />
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