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I . <br />. . , . <br />, , ! , . ! <br />; i ; ! . j <br />J , <br />, ~ . , . <br />. . . 1 <br />" , . , . <br /> . <br /> <br />~~l~~~:~~,~~~~~~~~~:a~~~~gf~~~~~;~~~~':~:;~~:; <br />,:~~:~~~,~;;;:;c:~::~::~:~~~:~;:;~:~;;;~:~:::, <br />..~~_h~A_~~~_._.~~"~~~~~~~~~~~~~:~;~~:~~~~ <br /> <br />. .. <br />, ",. <br />~~~~~~~~~~:~~~~~:~;%~~~~a;~~:~~;:=~:~~~~~~~:~~ <br /> <br />" <br /> <br /> <br />I <br /> <br />500 year flood event can als~ be used for regulating high <br />risk developments within the flood plain such as nuclear <br />power plants, or the storage or manufacture of toxic or <br />explosive materials. <br /> <br />I <br /> <br />I <br /> <br />1973 Peak Discharge <br /> <br />The City of Glenwood Springs has adopted an ordiance re- <br />stricting develo;:>ment ne>ar rivers and live stre>ams COrdi- <br />nanc,," No. 14, Series of 1977) which establishes a 30 foot <br />~etback area measured horiznntally from the high water <br />mark of the peak discharge occurring in 1973. The 197) <br />peak discharge portrayed on the flood profile~ (Plates <br />11-19) ~ay be utilized to determine the setback limits <br />for the ordinance. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Table ) lists the discharges and water surface elevations <br />for the 10, 50, 100 and 500 year flood events at selected <br />reference points. <br /> <br />I <br /> <br />Flooded Areas <br /> <br />I <br /> <br />The 100 year frequency flood has been selected by the <br />State of Colorado as the flood event to be used for flood <br />plain delineation and regulations. Thus the f'looded Area <br />plates show only the boundary of the 100 year flood plain. <br />Since the base maps fQr the Flooded Area plates are un- <br />rectified aerial ~hotos or enlarged u.s. Geoloqical Survey <br />Ou~dranglc maps, the flooded area limits on the plates <br />should be cO:1sidcrc(l <lpproxinate. "hen oxact li,nits of <br />flood~d areas are needed, the water surface profiles and/or <br />tabulated elevation data (Table J) should be used in con- <br />junction wit:' ..lccurate topographic [:laps of the area in <br />question. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />'1'1,,, .uea delineated on the FlOOded Are<l plates as the lOa <br />Y".lr flood pl<lin ",eets tr:e req'.:irer'lcnts of Il.ll. 1041 as <br />a.-: are<l of state intlCrest. Also upon official approval <br />of this report by the Color..uo W<lter COIltlervation floard <br />the area outlined by the 100 year flood boundary will be <br />designated as d flooc plain area and ~ay be> regulated <br />ac~ordi~gly by the local officials. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Flood Elev,ltions <br /> <br />FlouJ e,:leiit elevations ror 10, SO, IOU and 500 y'-',lf' floods <br />may be ~ound in ) separate loc~tions in this report. <br />The naad Frequency-Elevation ,lnd Dischan;e Data tobIe, <br />7ablc 3, liiits these elevations at selected reference <br />points. Th" flood profile plates (Plates 11-19) show <br />the high watel elevations for all 4 frequency floods. <br />,\lso the the Cross Section plates (Plates 20 and 21) <br />show a graphical represe~tation of the high ~~ter elevd~ <br />tions at typicdl valley cross sections throughout the <br />study reach. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />-16- <br /> <br />I <br /> <br />I <br /> <br />I <br />