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<br />'. <br /> <br />provided <br />Board. <br />corrments <br /> <br />in advance of publication <br />Starting conditions for <br />at the beginning of the <br /> <br />by the Colorado Water Conservation <br />other models are given in the <br />input file. <br /> <br />Flood Elevations <br />Flood profiles were plotted for the Cache Ia Poudre River main <br />channel showing computed water surface elevations for floods of the <br />selected recurrence intervals. The profile plates are included as <br />Attachment 1. <br /> <br />Flood Boundaries <br />The flood boundaries for the HH:J-year and 500-year floods were <br />delineated using the flood elevations determined at each cross <br />section. Between cross sections the flood boundaries were <br />interpolated using the topographic mapping. Lines of constant water <br />surface elevation for the 100-year event (Base Flood Elevations) were <br />also determined. At some cross sections the main channel and an <br />adjacent spill flow path may have different flood elevations. Where <br />the 100-year and 500-year flood boundaries were located too close <br />together to plot separately, only the 100-year boundary was plotted. <br />The flood boundaries were plotted on the 1"=200' scale orthophoto map <br />plates. The location and number of each individual plate are shown on <br />Figure 3. <br /> <br />In the vicinity of Dry Creek, the flood plains of Dry Creek and <br />the Cache Ia Poudre River are closely parallel and in some places <br />overlap. Some spills from the Cache Ia Poudre main flow can be <br />captured by Dry Creek and could cause flooding along that stream. <br />Flood boundaries in the Dry Creek drainage caused by these spills were <br />not determined. <br /> <br />10 <br /> <br />I , <br />