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<br />. <br /> <br />model along with the rainfall, loss and runoff parameters dis- <br /> <br /> <br />cussed on page 56. Flood routing along Boulder Creek was <br /> <br /> <br />accomplished using the Missouri River Division diffusion routing <br /> <br /> <br />technique. The conveyance information for the diffusion routing <br /> <br /> <br />was based on surveys made for the Flood Plain Information Report <br /> <br /> <br />published by the Omaha District in 1969. Sensitivity runs were <br /> <br /> <br />made in which model input parameters reflecting overland flow and <br /> <br /> <br />channel roughness were varied by 50 to 100 percent. The variation <br /> <br /> <br />in the results was only 2,000 to 3,000 cubic feet per second. The <br /> <br /> <br />final parameter selection was based on achieving probability <br /> <br /> <br />relationships that compared favorably with the discharge-probability <br /> <br /> <br />curve determined from the fragmentary record for Boulder Creek at <br /> <br /> <br />Boulder and with the regional criteria presented in Technical <br /> <br /> <br />Manual No.1, a manual for estimating flood characteristics of <br /> <br /> <br />natural flow streams in Colorado, prepared by the U,S. Geological <br /> <br /> <br />Survey for the Colorado Water Conservation Board and published in <br /> <br /> <br />1976. The discharge-probability curves determined by three methods <br /> <br /> <br />are shown on plate 60 for comparison. The peak discharge-probability <br /> <br /> <br />profile is shown on plate 61 and the 100-year hydro graphs at <br /> <br /> <br />selected locations are shown on plate 62. <br /> <br />KIOWA CREEK AT WIGGINS <br /> <br /> <br />The scope of the studies for Kiowa Creek was very preliminary <br /> <br /> <br />and did not permit application of the detailed modeling concepts <br /> <br /> <br />used in the Sand and Boulder Creek basins. The results of the <br /> <br /> <br />study should therefore be treated accordingly. A brief description <br /> <br /> <br />of the basin, its flood history and the hydrologic studies made are <br /> <br /> <br />presented in the following paragraphs. <br /> <br />Basin Description. Kiowa Creek, a high plains tributary of <br /> <br /> <br />the South Platte River, originates at the boundary between the <br /> <br />. <br /> <br />46 <br />