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<br />The starting water-surface elevation for Elk River was determined using <br /> <br />the slope-conveyance method (Shearman and others, 1985). Flood profiles were <br /> <br />drawn showing computed water-surface elevations to a plotted accuracy of 0.5 <br /> <br />foot for the 100-year flood. The flood profiles show the streambed elevation <br /> <br />and location of bridges and cross sections. All elevations are referenced to <br /> <br /> <br />the National Geodetic Vertical Datum of 1929 (NVGD); elevation reference marks <br /> <br /> <br />used in this study are described elsewhere in this report and are shown on <br /> <br /> <br />the map. <br /> <br />Flood boundaries were plotted at surveyed and synthesized cross section <br /> <br />and interpolated between cross sections based on the contours shown for the <br /> <br />7.5-minute topographic quadrangle map of Clark, Colorado. <br /> <br />Flood elevations in the study reach may be raised by debris blockage of <br /> <br />the river in the study area. The hydraulic analyses for this study, however, <br /> <br />are based only on the effect of unobstructed flow. The flood elevations, as <br /> <br />shown on the profiles, are considered valid only if hydraulic structures <br /> <br />remain unobstructed and do not fail. <br /> <br /> <br />4 <br />