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<br />the South Platte River in florgan and '~ashi ngton Counties WQuld
<br />rosultint.'e inundation of and subsequent damllge to primarily
<br />agricultural properties and associated deveioprr>ents "s "ell as
<br />public uti I Itl.;,s and public roadways. Deeptloodwaterflowlng
<br />at high velocity and carrying floating debris would create con-
<br />ditions hazardous to persons and vehicles attempting to cross
<br />flooded areas. Ingener,,', floodw"ter 30rmore feet deep "nd
<br />flowing at a velocity of 3 or more fect per second could easliy
<br />s"eap an adult person oft his feet, thus creatIng definite danger
<br />ot Injury or drowning, Rapid Iy rising and swiftly flo"lng flOOd-
<br />water may trap persons In homes that are ultimately destroyed or
<br />In vehicles that are ultimately submerged or floated, Isolation
<br />of areas by flood"aters could create hazards In torms of medical,
<br />fire, or law enforcement emergencies.
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<br />Study Results
<br />The results of this study dre presented in the form of flOOded
<br />aro(lS, plates 3 through 19S; wdtersurf"ceprofiles. plates 20
<br />through 21; clavation-discharge curves, pl(ltes 22 through 27; and
<br />flOOd plain reference data, table 7. Water surface elevation data
<br />~~s comput~d thr~ugh the use of the CO~~5 of Engineers computer
<br />programHEC-2"WaterSurfaceProflles", Thasacomputatlons"era
<br />based upon channel and flood plain conditIons as represontod by
<br />:;.rvoyscond;.;cted in the sprin!'jot :973andd"tacoilect.;d frOl1lthe
<br />South ?I(ltte River flood of May 1973, The location 01 each cross
<br />section 15 sho~n On tha flooded area plates,
<br />Water surface p~oflles lor the IO.year, 50-yaar, IOO-year, and
<br />500-year floods "are developed tor reachos at the South Platte River
<br />located In tho vicinIty of Fort Morgan and In Washington County nOar
<br />Messex, Th'lsallrQflias also show higl'l "ater marks for the May 1973
<br />flood and a cOlTl;luted w"te~ Sur lace prol; Ie w!"llco. represents that
<br />tlood, This computed 1973 flood proli 10 ;5 basM upon the observed
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