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<br />2.0 AREA STUDIED <br /> <br />2.1 Scope of Study <br /> <br />This Flood Insurance Study covers the geographic area of 'Arapahoe <br />County, Colorado. The area of study is shown on the Vicinity Map <br />(Figure 1). <br /> <br />In addition to the South Platte River, the following streams were <br />studied by detailed methods and are included in this study: Bear <br />Creek, Big Dry Creek, Big Dry Creek Tributary A, Blackmer Gulch, <br />Box Elder Creek, Cherry Creek, Coal Creek, Comanche Creek, Li ttle <br />Comanche Creek, Coon Creek, Cottonwood Creek, Dutch Creek, First <br />Creek, Granby Ditch, Goldsmith Gulch, West Tributary Goldsmith <br />Gulch, Greenwood Gulch, Happy Canyon Creek, Lee Gulch, Little <br />Creek, Little Dry Creek, Lone Tree Creek, Murphy Creek, Piney <br />Creek, Prentice Gulch, Quincy Gulch, Sable Ditch, Sable Ditch <br />Overflow, Sand Creek, Slaughterhouse Gulch, South Tributary to <br />Slaughterhouse Gulch, SJCD 6100, SJCD 6200, Spring Creek, West Toll <br />Gate Creek, West Toll Gate Creek Tributary, Unnamed Creek, West <br />Bijou Creek, Westerly Creek, and willow Creek. <br /> <br />~ <br /> <br />The tributary streams studied using approximate methods are as <br />follows: Upper reaches of Piney Creek and Coal Creek, Lone Tree <br />. . <br />Creek, Senac Creek, 1-05-4412 Creek, West Box Elder Creek, Box <br />Elder Creek, Kiowa Creek, Wolf Creek, Comanche Creek, Little <br />Comanche Creek, West Bijou Creek, Middle Bijou Creek, East Bijou <br />, Creek, Muddy Creek, and Deer Trail Creek. No development pressures <br />are foreseen on these streams for the next 5 years. <br /> <br />On the South Platte River, just upstream of the City of Littleton, <br />the COE has constructed Chatfield Dam. The primary purpose of the <br />dam is flood-control and recreation. The dam is nOW operational <br />for flood-control purposes and, therefore, flood hazards downstream <br />are based on the dam's operation. <br /> <br />This study also illustrates the flood hazard delineations resulting <br />from a channel improvement project developed by the. COE, Omaha, <br />Nebraska. <br /> <br />;. <br /> <br />The areas studied by detailed methods were selected with priority <br />given to' all known flood, hazard areas and, areas of projected <br />development Or proposed construction through 1991. <br /> <br />Approximate analyses were used to study those areas having a low <br />development potential or minimal flood hazards. The scope and <br />methods of stQdy were proposed to, and agreed upon by, FEMA and <br />Arapahoe County. <br /> <br />2.2 Community Description <br /> <br />Arapahoe County is located in central Colorado, just south and east <br />of Denver. The general physical boundary is that of a rectangle 12 <br /> <br />4 <br />