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<br />section, The Elm Creek flood boundary generated by the hydraulic <br /> <br /> <br />model closely matched the actual June 1990 flood boundary provided by <br /> <br /> <br />the Village of Platte Center. Based on this information, it is <br /> <br /> <br />reasonable to assume that the June 1990 flood had an estimated <br /> <br /> <br />discharge of 13,200 c.f.s. along Elm Creek in Platte Center. Based on <br /> <br /> <br />the hydrologic information developed as part of this report, the June <br /> <br /> <br />1990 flood on Elm Creek was approximately a 50-year frequency. After <br /> <br />the model was calibrated, the lO-, 50-. and lOa-year discharges were <br /> <br /> <br />then used to generate water surface elevations necessary for the <br /> <br /> <br />economic analysis. <br /> <br />", <br /> <br />FLOOD HAZARD AREA <br /> <br />Figure 2 illustrates the water surface profile coinciding with the <br /> <br /> <br />model of the 1990 flood event. The flood water surface elevations <br /> <br /> <br />computed at each cross section were used to determine the flood <br /> <br /> <br />boundary for all but the southwest corner of Platte Center. Flood <br /> <br /> <br />bounCkries in this area are based on the 1990 flood conditions for <br />~.. ~. <br /> <br />Shell "Creek developed by HDR. Betw'een the 'cross sections, the flood <br /> <br /> <br />boundaries of the 1990 Elm Creek flood Were interpolated using the <br /> <br /> <br />USGS 7.5-minute quadrangle mapping. The flood boundary map is located <br /> <br /> <br />in appendix A. <br /> <br />- <br /> <br />~ <br /> <br />9 <br />