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<br />1 <br /> <br />INTRODUCTION <br /> <br />The hydraulic analysis for the Boxelder Flood Plain Management Study <br /> <br />involves water surface profile computations that require Mannings roughness <br /> <br />coefficients. A field reconnaissance was conducted along the Boxelder, and <br /> <br />Coal Creek drainages, within the study limits, to establish and document <br /> <br />roughness coefficients. Table 1 lists the established values by reach. <br /> <br />Documenting photographs follow the table. The map included can be used in <br /> <br />conjunction with the table and photographs for location purposes. <br /> <br />The downstream study limit borders on a similar study done by Simons, <br />Li, and Associates (August 1981). Hydraulic roughness coefficients and <br />documenting photographs used in that study were reviewed for purposes of <br /> <br />consistency. <br /> <br />The coefficients shown in this document will be used in the U.S. Army <br /> <br />Corps of Engineers HEC-2 water surface profile computer program. Results of <br /> <br />this analysis can be found in the subject report prepared by the Soil <br /> <br />Conservation Service in cooperation with the Colorado Water Conservation <br /> <br />Board, the Town of Wellington, and Larimer County. <br />