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<br />I ' <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />J C'" k \01 busy <br /> <br />ICON ENGINEERING, INC. <br /> <br />3131 South Vaughn Way, Suite 428, Aurora, Colorado 80014 <br /> <br />Phone (303)755-9000 FAX (303) 755-2765 <br /> <br />February 3, 1997 <br /> <br />CH'j ;:;1 g;~~!ing <br /> <br />Mr. Wayne Bethurwn <br />Design Technics, LLC. <br />P,O. Box 408 <br />Sterling, Colorado 80751 <br /> <br />rEB 1 0 '97 <br />Publi& Works \}apt <br /> <br />RE: Floodplain Analysis, Pawnee Creek Overflows <br /> <br />Dear Wayne: <br /> <br />ICON Engineering, Inc. has completed a floodplain study for the Pawnee Creek Overflows from <br />Iris Drive to County Road 24 in Logan County and the City of Sterling, Colorado, The resulting <br />floodplain is presented on Sheet I of2, which is enclosed with this letter for you use. <br /> <br />As a part of our analysis we reviewed the following two studies which were completed earlier to <br />address the Pawnee Creek overflows: <br /> <br />1, Floodplain Information and Drainalje PIM for Sand Creek and the Pawnee Overflow at <br />Sterlinlj. Colorado. Charles F, Leaf and Resource Consultants, May 1983; and <br /> <br />2, Flood Plain Manaljement Studv. Pawnee Creek in LOljan County. Colorado Soil <br />Conservation Service (SCS), April 1992. <br /> <br />The first study investigated the overflows from the South Plane River through the City of <br />Sterling to Iris Drive, Detailed hydrology was completed as a part of this study, This hydrology <br />was adopted by the Federal Emergency Management Agency (FEMA) and used in their Flood <br />Insurance Study dated September 29, 1989. According to this hydrology, the Pawnee Creek <br />overflows are equal to 5,000 cubic feet per second (cfs) during the JOO-year stonn. <br /> <br />The second study investigated the overflows from the point where they leave the banks of <br />Pawnee Creek north to County Road 29. Detailed hydrology was also completed for this study <br />and the reported peak discharge during the lOO-year storm for the Pawnee Creek Overflows is <br />4,242 efs. <br /> <br />Neither of the two previous studies delineated the floodplain between County Road 29 and Iris <br />Drive. The purpose of this study is to delineate the floodplain in this area and evaluate the <br />potential impacts to the proposed Design Techniques Subdivision. Since this area is currently <br />regulated by FEMA, the accepted flow of 5,000 cfs was used for our analysis, <br />