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<br />, <br /> <br />~. 0 AREA STUDIED <br /> <br />2.1 Scope of Study <br /> <br />This Flood Insurance Study covers the incorporated area of the Town <br />of superior, Boulder County, Colorado. The area of study is shown <br />On the Vicinity Map (Figure 1) . <br /> <br />Floods caused by overflow of Coal Creek were studied in detail. <br />Those areas studied by detailed methods were chosen with considera- <br />tion given to all proposed construction and forecasted development <br />through 1978. <br /> <br />f" <br /> <br />4j <br /> <br />, <br /> <br />2.2 Community Description <br /> <br />The Town of Superior is located in southeastern Boulder County, in <br />north-central Colorado, approximately 20 miles northwest of Denver. <br />In 1970, the population of Superior was 171 (Reference 1), and is now <br />estimated to be 260. Nearby communities are, Louisville, 5 miles <br />northeast; Boulder, 6 miles northwest; Lafayette, approximately 7 <br />miles northeast; and Broomfield, 7 miles southeast. Superior is <br />surrounded by unincorporated areas of Boulder County. <br /> <br />The Coal Creek and Rock Creek watersheds drain an area of approximately <br />79 square miles, most of which is located in southeastern Boulder <br />County. Coal Creek flows northeasterly, joining Boulder Creek in <br />east-central Boulder County. Boulder Creek flows into St, Vrain <br />Creek, a major tributary to the South Platte River'. These drainages <br />are in the South Platte subregion of the Missouri River Water Resources <br />Region, as designated by the u.S. Water Resources Council. <br /> <br />,:1 <br />;h'.' <br />':~~I <br />,,1. <br /> <br />"" <br />.~ <br /> <br />Coal Creek flows through primarily agricultural land. Land use, <br />which is not zoned within the Town of Superior, is primarily ~'esi- <br />dential. <br /> <br />:~.I " <br />Ii <br /> <br />The upstream drainage area originates in the foothills east of the <br />Rocky Mountains, and the geology is characterized by a series of <br />folded and faulted sedimentary strata. For the most part, the <br />strata are classified as Fox Hills Sandstone and Laramie formation. <br />Soils are shallow, very gravelly, and stony, and in the rock outcrop- <br />Juget-Baller association. Ground cover consists of native grasses <br />and woodland. Except for a narrow fringe of Rocky Hountain juniper <br />trees, ponderosa pine trees make up the bulk of the woodland cover. <br />The woodlands are very picturesqu~ and most of the area is used for <br />grazing and homesites, with both year-round and summer homes. <br /> <br />,~ <br />'I"'; <br />.j <br />'il <br />>~ <br />,'1..' <br />,j,\~ <br />::'; '~ <br /> <br />Average annual precipitation is approximately 18.5 inches and the <br />normal mean temperature is 51.80P. Extremes of annual precipitation <br />have varied from a maximum of 29.09 inches in 1938 to a minimum of <br />10.91 inches in 1954. The mean maximum and minimum temperatures in <br />July are 85.30F and 59.0oF, respectively, <br /> <br />2 <br />