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FLOOD02136
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Last modified
1/25/2010 6:23:29 PM
Creation date
10/4/2006 10:38:26 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
310
County
Logan
Community
Unincorporated Logan County
Stream Name
South Platte River
Basin
South Platte
Title
Floodplain Information Report - South Platte River, Logan County, Colorado, Approximate 100-year Floodplain Boundaries, From Sterling to Atwood
Date
9/1/1990
Designation Date
1/1/1991
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />TABLE FOlnt <br />COMPARISON OF SECTION 22 STtJDoY <br />AND SPECIAL FLOOD IlAZlUU> STUD'Y <br />FOR A 100-YEAR DISCHARGE ()F 84,000 C.F,ll. <br /> <br />station <br /> <br />computed Flood <br />Hazard Water <br />Surface Elevation <br /> <br />Compui;ed Floc.d <br />Hal~a~d Ratin.g <br />~U~lJE!"J!llevation <br /> <br />SEC. 22 computed <br />Water Surface <br />~levation <br /> <br />21980 <br />26440 <br />51140 <br /> <br />3945.7 <br />3952,5 <br />n/a <br /> <br />n/a <br />n/a <br />3986.1 <br /> <br />3946.3 <br />3952.0 <br />3988.0 <br /> <br />;1.3 Flooded Area Boundaries. Th,~ flooded area outlines <br />were drawn on the U.S,G,S. Quadrangle map with a 10 foot <br />contour interval. The outlines WHre based on the water <br />surface profiles shown on Plate 1, For t,he Sterling area <br />approximate flood boundaries for only the S,:)uth Platte River <br />w.ere drawn on the Quadrangle map. More detailed Clutlines for <br />combined flooding from the Sou1;h Pla'tt.e and Pawnee Creek are <br />available in the 1978 Flood Plain Informat:ion Study, South <br />Platte and Pawnee Creek, Sterling, Colorado. For the overall <br />100-year flood boundary, the more de1::ailed information should <br />be used in place of the outlines provided by this study for <br />the City of Sterling. The approximate 100-year flooded area <br />boundaries are shown on Plate 2. <br /> <br />:~ LIMITATIONS OF THE STUDY. <br /> <br />The study provides approximat,e 100-year water surface <br />elevations and flooded area boundaries. The error for any <br />modeled cross section is on the aVE'ra\ge 2,5 felet but: probably <br />not exceeding a maximum of 6,0 fE,et:. The use of 'the same <br />surveyed cross section throughout t:h,e reach may also provide <br />some error, but because it was a "narrow" cross section it <br />should err on the high side, The study should be of <br />sufficient accuracy, however, to out:line the 100.-year flooded <br />area for planning of water resources: in the area. <br /> <br />TABLE FIV;~l <br /> <br />COMPUTER <br />FILENAME <br /> <br />;~'I:LE PURPOSE <br /> <br />ATSTER22,DAT <br /> <br />Existing conditions file <br /> <br />ATSTER22,PLT <br /> <br />Plot file wi'th exist:ing conditions" <br /> <br />7 <br />
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