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<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.
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<br />
<br />1973 Peak Discharge
<br />
<br />The City of Glenwood Springs has adopted an ordiance re-
<br />stricting develo;:>ment nC'ar rivers and live strC'ams (Ordi-
<br />nance No. 14, Series of 1977) which establishes a 30 foot
<br />~ctback 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 setb~ck limits
<br />for the ordinance.
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<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.
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<br />
<br />Flooded Areas
<br />
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<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 ~erial ~hotos or enlarged u.s. Gcoloqical Survey
<br />Ou~drangle maps, the flooded area limits on the plates
<br />should be cO:1sidcrc(l <lpproxinate. "hen exact li,nits of
<br />flood~d arcas 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.
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<br />
<br />'1'1,e .uail delineated on the FlOOded Area plates as the lOa
<br />Y".lr flood plain ",eats tr:e req'.:ircr'lcnts of Il.ll. 1041 as
<br />a.-: area of state intlCrest. Also upon official approval
<br />of this report by the Color...uo W<lLer COIltlervation floard
<br />the area outlined by the 100 year flood boundary will be
<br />designated as d flooc plain area and ~ay bC' regulated
<br />ac~ordi~gly by the local officials.
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<br />
<br />Flood Elev,lLions
<br />
<br />FlouJ Cleiit elevations ror 10, SO, IOU and 500 YC,lf' floods
<br />may be ~ound in ) separate loc~tions in this report.
<br />The naad Frequency-Elevation "nd Dischan;e Datu tilble,
<br />7ablc ), liiits these elevations at selected reference
<br />points. Th" flood profile plates (Plates 11-19) show
<br />the high walCl elevations for all 4 frequency floods.
<br />,\lso the the Cross Section plates (Platcs 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.
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<br />-16-
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