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<br />, <br /> <br />To further define the discharge-frequency relationship for Elm <br /> <br /> <br />Creek, actual rainfall data were evaluated to determine the frequency <br /> <br />of the event that caused the June 1990 flood. <br /> <br />The rainfall <br /> <br />gage data <br />indicated <br /> <br />is located in appendix B. <br />the rainstorm had a return <br /> <br />The results of this evaluation <br /> <br />period ranging from 10 to 50 years. <br /> <br />For purposes of this study and report, the preliminary hydrologic <br /> <br /> <br />analysis conducted was considered to be appropriate. However, if <br /> <br /> <br />further studies are conducted on Elm Creek, such as those for a Flood <br /> <br /> <br />Insurance Study (FIS) or for development of a flood warning system for <br /> <br />Platte Center, a much more detailed hydrologic::' analysis would be <br /> <br />" <br /> <br />required. <br /> <br />DATA <br /> <br />~e USGS 7.5 minute quadrangle map was' used as a base map of <br />the a'Cea. Cross sections through the study.,reach were field S}lrveyed <br />in February 1991 by the NRC. . <br /> <br />There were also a number of high-wacer marks from che flood of <br />June 1990 that Were surveyed by the Corps im=ediate1y after the flood <br />and by the NRC in F~bruary 1991 prior to this study. The first five <br />high-water marks listed in table 2 were l,!Sed in the model of Elm <br />Creek; the sixth mark was used to determin~ the minimum levee height <br />. ... <br />required to proCect the southwesc corner of Platte Center. The <br /> <br />locations of these marks are shown in figure 1. <br /> <br />5 <br />