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<br />
<br />Platte River In Logan end Sedgwick Counties would result In the
<br />fnundation of end subsequent damage to prlmer!ly agricultural
<br />propertles,"ndassoclllteddevelopmentseswell aspublTcutllltles
<br />and pUblIc roadways. Deep floodwater flowing at high velocity and
<br />carrying floating debris would create conditions hazardous to persons
<br />and vehIcles llttemptlng to cross flOOded areas. In gene..a), flood-
<br />"ater 3 or more teet deep and tlowlng at " velocity of 3 or more
<br />feet per second could easily sweep an adult person off hIs feet,
<br />thus creating deflnlte danger of Injury or drowning. Rapidly rising
<br />and swiftly flowing floodwater may trap persons In homes that are
<br />ultImately destroyed or In vehIcles that are ultimately submerged
<br />or floated. Isolation of areas by floodwaters could create hazards
<br />In terms of medical, fIre, or law enforcement emergencies.
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<br />StudY Results
<br />The results of this study are presented In the form of flooded
<br />areas, plates 3 through 28; water surface profiles, plates 29 through
<br />32; elevation-discharge curves, plates 33 through 43; and flood plain
<br />reference data, table 6. Water surface elevation deta was computed
<br />through the use of the Corps of Engineers computer program HEC-2
<br />"Water Surface Profiles". These comoutatlons loIere besed Ullonchennel
<br />and flood plain conditions as represented by surveys conducted In the
<br />spring of 1973 and data collected from the South Platte River flood of
<br />May 1973. The location of each cross section Is shown on tho flooded
<br />area plates.
<br />Water surface profiles for the IO-year,50-yoar, l00-year,and
<br />500-year floods were developed for reaChes of the South Platte RIver
<br />locattld in th., viclnityol Sttlriing end JulesDurg, ColoradO. IMse
<br />prof ties elso show high water marks for the May 1973 flOOd and a
<br />computed water surface profile which represents that flood. ThIs
<br />computed 1973 flOOd profIle Is based upon the Observed high loIater
<br />merks Shown and Isa "best flt"protlle, Elevation-dlschargecurv9S
<br />showl"gthe!O-ye"r,SO-ye",",IOO-ye"r,""dSOO_yearfloods"real"lO
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