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<br />B~raulic Analyses <br /> <br />Analyses of the hydraulic characteristics of the stream in <br />the community were carried out to determine the elevations of <br />floods of selected recurrence intervals along the stream reach <br />which were studied in detail. <br /> <br />Cross-section data for Kiowa Creek near the study area were <br />obtained from field surveys by the Colorado Water Conservation <br />Board and ARIX, Inc. All bridges and backwater-producing <br />structures were surveyed to obtain elevation data and <br />structural geometry. Locations of selected cross-sections used <br />in the hydraulic anaylses are shown in the Flood Profiles <br />(Plate 3). <br /> <br />Roughness coefficients (Manning's On"~) for Kirrwa Creek were <br />estimated by field inspection. The channel Un" used for Kiowa <br />Creek was 0.03 and the overbank values ranged from 0.04 to 0.05. <br /> <br />Starting elevations for backwater computations were <br />determined by using the slope area method. Water surface <br />prefiles were computed for the 10-, 50-. 100-, and SOD-year <br />fleods using the U.S. Army Corps of Engineers HEC-2 computer <br />pregram (Reference 2). <br /> <br />Flood profiles were drawn to an accuracy of 0.5 foot for <br />floods of selected recurrence intervals. All elevations are <br />referenced to the National Geodetic Vertical Datum of 1929 <br />(NGVD). Elevation reference marks used in the' study are shown <br />on the maps. <br /> <br />-5- <br />