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<br />" <br /> <br />" <br /> <br />HYDROLOGIC AND HYDRAULIC ANALYSIS <br /> <br />Hydrologic Analysis <br />The hydrologic analysis for this study of the Roaring Fork drainage basin <br />wascompletedbytheU. S.ArmyCorpsofEngineers (Reference3),and is <br />included in the Technical Addendum (Reference 11). A regional analysis <br />of stream data taken at gages in the Roaring Fork Basin was performed by <br />the Corps of Engineers and natural flow frequency curveS were developed. <br />The peak flows determined for the 10,50, 100 and 500-year floods were used <br />to determine the flood profiles and the 100~year flOodplain for this report. <br />Toble21ists the peak discharges for these floods on the Roaring F orkand <br />Fryingpanrivers. For a detailed descdPtionof the hydrologic analysis <br />performed by the Corps of Engineers, refer to the TechnIcal Addendum (Re. <br />ferencel1). <br /> <br />FlO<XiCharaeter;stlcs <br />Floodflowson the Roaring Fork and Frylngpan Rivers result from rap idmelting <br />of the mountain snowpackdur1ng the period from May toear\y July. Snowmelt <br />runoff ""'y occasIonally be augmented by rain. Thesnowmeltrunofflscharac- <br />terized by sustaIned periods of high flows and marked dlurnal fluctuation. <br />E~amlnat Ion of meteorological and c 11",atological condl t Ions and preclpl tat Ion <br />and streamflow records show that summer cloudbursts are not a great flO<Xi <br />threat on these streams. <br />