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<br />Flood Insurance Studies are indeed compatible with previous <br />studies, <br /> <br />Using the regional curves in the Flood Insurance Studies <br /> <br /> <br />resulted in inconsistent answers because they do not retlect <br /> <br /> <br />reservoir operations nor detined the assumptions made in <br />arriving at contributing drainage area values. <br /> <br />Finally, please note the 100-year discharges are only <br /> <br /> <br />slightly higher than the May, 1973 flood peak at 11,000 efs <br /> <br /> <br />which was recorded at the Littleton Gage near Centennial Race <br /> <br /> <br />Track, <br /> <br />Hydraulics <br /> <br />No new HEC-2 hydraulic computations were made in this <br /> <br /> <br />report. Rather cross-section and profile information were just <br /> <br /> <br />simply transferred onto one set of profiles and maps from the <br />sources listed in Table 1. <br /> <br />Several items of interest were noted in ;this process, <br />First, the profiles herein show a low watersurface line on July <br /> <br /> <br />1. 1983 rather than a channel thalweg as given in ;the flood <br /> <br /> <br />insurance studies. When this low water line was plotted from <br /> <br /> <br />the July I, 1983 mapping done by Falcon Air Maps a number of <br /> <br /> <br />channel bottom fluxations did not appear, the most notable <br /> <br /> <br />being the Brown's Ditch Diversion Dam, There are two main <br /> <br /> <br />reasons for this, One. flows were around 1900 cfs in the river <br /> <br /> <br />-7- <br />