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I I The information in this report does not imply any State action to zone or regulate use of the flood plains. The District has the authority to reg- ulate flood plains, but to date has chosen to leave flood plain regulation responsibility with local governments. The report provides a suitable basis for the adoption of land use controls to guide flood plain management, with consideration for environmental attributes, and thereby prevent intensifica- tion of flood losses. Flood water surface elevations and flood plain bound- aries are often revised by road and bridge construction, flood plain devel- opment, flood control improvements, or natural process. Prior to utilization of this report for planning or design purposes, the user is advised to con- tact the Urban Drainage & Flood Control District or the Colorado Water Con- servation Board to determine if the information in this report has been amen- ded. Drainage and Flood Control District. The Basin takes its name from four major drainageways which are located within the basin on the west side of the Tributary to the South Platte River approximately 3 miles downstream from the Chatfield Dam and Reservoir. I I I I The Study Basin Area, as shown on Figure I, is located in Arapahoe County, Jefferson County, and Denver City and County. It I ies generally between Belleview Avenue and Coal Mine Road extending westerly from the South Platte River to approximately 2.5 miles west of the Hogback. The Basin totals approximately 16 square miles which is generally appor- tioned to the local governmental jurisdictions located within the Basin as fo II ows : I I I Data Acknowledgments Arapahoe County 0.58 sq. mi. Denver City and County 3.15 sq. mi. Jefferson County 11.75 sq. mi. Town of Columbine Valley 0.47 sq. mi. I The report was prepared by URS Company, Consulting Engineers, Denver, Colorado, at the request of the Urban Drainage and Flood Control District. I All survey and topographic data for this study were collected and compiled by Delta Aerial Surveys, Inc., Denver, Colorado, under a separate contract with the Urban Drainage & Flood Control District. Drainage Basin Characteristics I Various agencies, including the Corps of Engineers, United States Geological Survey, Soil Conservation Service and State Engineer were contacted during this investigation. Information provided by these agencies has been incor- porated into the study. Technical data developed in this study is on file with the Urban Drainage and Flood Control District. Being located on the southern fringe of the Denver Metropolitan Area, much of the Basin is currently undeveloped open space. However, the spread of urbanization into the Basin has in recent years accelerated rapidly primarily in the form of new subdivisions of single family residential dwelling units. Very few commercial establishments are presently located I I within the Basin. In addition to the existing development, the Basin has a I generally roll ing terrain with well defined drainageways having a varying amount of vegetatIon. DRAINAGE BASIN DESCRIPTION I Locat i on Soil types prevalent within the study area and their characteristics were determined from publications of the Soil Conservation Service, namely the Soil Survey of Arapahoe County, dated March 1971; General I This report covers the study area of Dutch Creek, Lilley Gulch, Coon Creek and 3 Lakes Tributary Drainage Basin which is part of the South Side Plan- ning Basin as identified in the Project REUSE Final Reportl authored by the Denver Regional Council of Governments in cooperation with the Urban I. Urban Storm Drainage and Flood Control in Denver Region - Final Report, August 1972, Project REUSE (Renewing the Environment through Urban System Engineering). I I 2