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<br />established by determining the water surface elevation from the <br />profile or reference tables and then locating that elevation by <br />survey on the flood plain.. <br /> <br />A reference line is shown on the Flooded Areas for both <br />the Big Thompson River and for the Little Thompson River. This <br />line is used for reference only and does not necessarily coincide <br />with the existing stream channel even though It may be referred <br />to as such in this report. <br /> <br />The flood elevations shown on the profile and in tables <br />7 and 8 apply laterally from the channel over most of the flood <br />plain width. Road crossings and other topographic features can <br />alter the lateral flood elevations. Depending on whether these <br />features divert or block flows, the flood elevations at the edge <br />of the flood plain may be higher or lower than at the channel. <br /> <br />Flood plain widths vary from one area to another through- <br />out the study reach. The 100-year flood plain width of the Big <br />Thompson River varies from a minimum near 800 feet to a maximum <br />near 4,000 feet with an average of 1,200 feet. Likewise, the 100- <br />year flood plain width of the Little Thompson River varies from a <br />minimum near 100 feet to a maximum near 900 feet with an average <br />of 500 feet. In general, the flood plains of both the Big Thompson <br />River and the Little Thompson River are of relatively uniform <br />width. <br /> <br />The maJor portion of <br />the Big Thompson River and the <br />reach Is in agricultural use. <br />this flood plain. Those that <br />oriented. <br /> <br />the 100-year flood plain of both <br />Little Thompson River In the study <br />Few buildings of any type exist on <br />do exist are primarily agriculturally <br /> <br />26 <br />