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<br />CHAPTER III <br />STUDY AREA DESCRIPTIOS <br /> <br />A. Draina~e Basin Characteristics <br /> <br />The Dry Creek No. 1 basin is located between the Lefthand Creek and <br />St. Vrain Creek basins and is southwest of the City of Longmont. A map <br />showing the Dry Creek No.1 drainage basin is shown in Figure-2. The headwaters <br />originate on Table Mountain approximately seven miles west of Longmont. Nearly <br />all of the upper basin rributaries flow into irrigation reservoirs. Five <br />of the reservoirs were considered to be of sufficient sise to affect flood <br /> <br />peaks. These reservoirs; i.e. Clover aasin Reservoir, Steele Lake No.1, <br />Swede Lake No.1. Lagerman Reservoir, and Lefthand Reservoir, were in- <br />corporated into the hydrologic analysis as explained in Chapter V. <br /> <br />The Steele Lakes and Clovet Basin tributaries combine with the msin <br />Dry Creek ~o. 1 channel approximately One half mile downstream from North <br />75th Street. From this point the creek ftows directly east through <br />agricultural land and into the southern edge of Longmont. The creek empties <br />into St. Vrain Creek approximately O.t mile downstream from State Highway <br />287. <br /> <br />The maximum basin elevation is approximately 5600 feet on Table <br />Mountain and the minimum elevation at the muuth is approximately 4930 feet <br />above ~ean sea level (MSL). The ehannel alignment is relatively straight <br />with an average slope of six tenths of One percent through the study teach. <br /> <br />The drainage area fot Dry Creek No. I at a number of points along <br />the study reach is listed in Table-2. <br /> <br />13 <br />