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<br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />\,,1' <br /> <br />to join with Rifle Creek just outside of the city limits. <br /> <br /> <br />Most u. <br /> <br />runoff in Goverru'1ler.t Creek comes from the steep side slopes <br /> <br />of GftJ.."J JJogback ridee. Upper eleva1;ions in Hogback ridge are above <br /> <br />9,100 feet. Ground cover is mostly sage brush. Rifle Creek then <br /> <br />flows through town and empties into the Colorado River. Drainage area <br /> <br />of Governme~t Creek at the mouth is 43.4 square miles. Hubbard Creek, <br /> <br />a small foothill tributary of 7.8 s~uare miles, joins Rifle Creek <br /> <br />within the city limits. <br /> <br />Flood problems in Rifle, Colorado result mostly from high intensity <br /> <br />rainfall over some portion of Rifle Creek basin. Since the construction <br /> <br />of Rifle Gap Dam the ma~or flood producinR area will be Gqyernment Cre~ <br />- ... <br /> <br />and remaining local area between the dam and the city limits. The drainage <br /> <br /> <br />area was divided into four sub-basins in order to'determine flows at the <br /> <br />requested index points. <br /> <br />Flood damage along the Colorado River would probably be confined to <br /> <br />structures and facilities located close to the river, such as the sewage <br /> <br />treatment plant weS1; of town and a vanadium plant east of town. High <br /> <br />flows in the Colorado River at this lOCation come from snowmelt events. <br /> <br />The drainage area Of the Colorado River at Rifle is about 6930 square <br /> <br />miles. Strea:.mflow records are available at such key stations, as <br />, ' <br /> <br />ColoradO River at Glenwood Springs (1900-6;;), Colorado River near <br /> <br />Cameo (1934-62), Colorado River near Palisade (1902-33)" and Colorado <br /> <br />River near Fruita (1908-23). <br /> <br />Thel: gage at Glenwood Springs was moved <br />,", <br /> <br />2 <br />