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<br />MONTROSE FLOODPLAIN STUDY <br /> <br />HYDRAULICS TECHNICAL ADDENDUM <br /> <br />I. GENERAL <br /> <br />A. Hydrology <br />The background data and a descr~ption of the work involved in <br /> <br />the preparation of the hydrology for this study are contained in the <br />report entitled "Montrose Floodplain Study Hydrology Addendum." Basin <br />i nformat ion, rai nfa 11 data, and sample fload hydrographs for the <br />various design stor~s (10, 50, 100, and 500-year frequencies) are pre- <br />sented therein. The hydrology r'eport has been previously submitted and <br /> <br />approved by the City of Montrose and the CWCB. <br />B. General Channel Descril1io~ <br /> <br />Three natural water courses an" included in this study: <br /> <br />Cedar Creek, Montrose Arroyo, and Dry Cedar Creek. <br /> <br />Cedar Creek, the northernmost study stream, runs from its upper <br /> <br />reaches in the Cimmaron Ridge area of themuntains approximately 13 <br /> <br />mil es east of Montrose, genera 11y westwa I'd, th rough the northeast por- <br />tion of the City, to its confluence with the Uncompahgre River <br /> <br />(approximately 3 miles northwest of Montr'ose). The specific study <br /> <br />reach for this stream lies between the Fairview Water Treatment Plant <br /> <br />and the stream's confluence with the Uncompahgre River. <br /> <br />The study reaches of Cedar Creek in the non-urbani zed areas are <br /> <br />characteri zed by channel secti ons of si gl1i fi cant capacity with madera, <br />tely heavy overbank vegetation growth. W'ithin the urbanized area, the <br />road crossings are usually limited in capacity. Debris is generated <br /> <br />from scrub oak and sagebrush pl us overbank vegetat i on growth. <br /> <br />1 <br />