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<br />Page 12
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<br />July 24, 2000
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<br />Page 13
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<br />20 25 :D 35
<br />srAllOt>JNG FRaVI WOUlH (1TiIes)
<br />
<br />July 24, 2000
<br />
<br />u.s. Army Corps of Engineers completed hydrologic analyses of the Roaring Fork River, and the
<br />published information is presented graphically in Figure 5
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<br />* Peak discharges were
<br />McLaughlin Engineers,
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<br />taken from Floodplain
<br />1976.
<br />
<br />Information Report, Roaring Fork River,
<br />
<br />Stream Reach Cumulative Flood Peaks in cfs
<br /> Drainage For Different Return Intervals
<br /> Area
<br /> (Sq. mi.)
<br /> 10-yr 50-yr 100-yr 500- vr
<br />Fryingpan River, above Basalt 298 2,250 3,300 3,950 7,150
<br />Roaring Fork River, above 510 6,100 8,500 9,400 12,200
<br />Fryingpan Ri ver*
<br />Roaring Fork River, above 850 7,100 9,400 10,400 14,300
<br />Sopris Creek, below Fryingpan
<br />Ri ver
<br />Roaring Fork river, above 870 7,300 9,800 10,800 l4,700
<br />Garfield County Line, below
<br />Sooris Creek
<br />
<br />Source: U.S
<br />
<br />Army Corps of Engineers study values published in Flood Hazard Reports
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<br />NoI:ice that the Crystal River vuith a 364 sq. 1Ti. ctainage adds 6,600 cfs
<br />to the 100-year flood flcm in the Roaring Fak River, whereas
<br />the Fryingpan River with a 290 sq. 1Ti. ctainage adds ooIy 1,000 cis.
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<br />ort Town oJ Basalt, Eagle & Pitkin Counties, Colorado
<br />- SECTION 4 - HYDROLOGIC AND HYDRAULIC ANALYSIS
<br />4.1 Hydrologic Analysis
<br />The hydrologic analysis for this study of the Roaring Fork drainage basin was completed by the U.S.
<br />Army Corps of Engineers. A regional analysis of stream data taken at gages in the Roaring Fork Basin
<br />was performed and natural flow frequency curves were developed. The peak flows determined for the 10,
<br />50, 100 and 500-year floods were used to determine the flood profiles and the 100-year floodplain for this
<br />report. Table 2 lists the peak discharges for these floods on the Roaring Fork River.
<br /> TABLE 2
<br /> DESIGN FLOOD FLOWS
<br />FOR THE ROARING FORK RIVER
<br />
<br />25,CXXl
<br />
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<br />~ogy data 1rool the us. Pmrt Corps of Engineers assurres
<br />Rued Feservoir is operated as a flood cootrol reservoir, a1thoogh
<br />the ElJreau of Redarmtion dd not coostruct the reservoir fa' flood
<br />oontrol purposes and has not assigned pen IlBIlel1t flood control
<br />storage in the reservoir.
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<br />
<br />ROARING FORK RIVER
<br />HVDROLOOY SUMVIARY
<br />
<br />Figure 5
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<br />le & Pitkin Counties, Colorado
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