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<br />
<br />the South Platte River In ~\()rgan an~ Washington Counties w~uld
<br />result In the Inundation of and subsequent da~ge to primarily
<br />agricultural properties and associated developments as well as
<br />publ ic uti I ities afld putJl ie road~'ays. Deep floodwater f lowl ng
<br />at high velocity and carrying floating debris would create 00"1-
<br />ditions hazardous to persons and vehicles attempting to cross
<br />f loaded areas. In gonora I, f 100dwater ~ or more feet deep a"ld
<br />flowing at a velocIty oj 3 or more feet per second could easIly
<br />sweep an adult person off his feet, thus creating definite danger
<br />of Injury or drowning. Rapidly rising and swiftly flowing flOOd-
<br />water may trap persons in homes that are ultimately destroyed or
<br />In vehicles that are ultimately subfl'\{!rged or floated. Isolation
<br />of areas by floodwaters could create hazards In terms of medical,
<br />fire, or law enforcement emergencies.
<br />
<br />StudY ReSults
<br />The results of this study are presented In the form of flOOded
<br />aroils. plates 3 through 19S; water surface prof i Ic~, pi 3tO~ 20
<br />th~ough 71; plevation-dlsoh~rge curves. plates 12 through 27; and
<br />flood pl~in reference data. table 7. Water surface elevation data
<br />was computed through fhe use of the ~rps of Engineers co~~uter
<br />programflEC-2 "Wator Surface Profiles'.. ThCseCO'rlputationswere
<br />based UpOn channel and flood pl~ln conditIons as reprc~cntcd by
<br />surveys conducted In the sprlng of 1973 and data collected from the
<br />SouthPlatteRivcrfloodotl'.eyl'JI.l.lhelOClIttonOleacncross
<br />section is shown on the flooded area pl~tcs.
<br />Water sudar.e profiles tor the IO-year, 50-year. IOO-YC/lr. and
<br />500-year floods were develnpnn for rn~r.he~ of the South Platte River
<br />located in the vicinity of Fort ~~rgan and in Washington County near
<br />Wessex. These profiles also show high water marks for the V~y 197~
<br />flOOd and 11 computed water surface proflte whiCh represents that
<br />flood. Ihls computed l'il.l 11000 proiiio Is bdsod upon H,,, ob,...,v..<i
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