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I \ 1 2 { I I I ! ! 1 I I I I I I I 1 I I The information in this report does not imply any state action to zone or regulate use of flood plains. The District has the authority. to regulate flood plains, but to date has chosen to leave flood plain regulation responsibility with local govern- ments. The report provides a suitable basis for the adoption of land use controls to guide flood plain management, with con- sideration for environmental attributes, and thereby prevent intensification of flood losses. STUDY AREA DESCRIPTION Flood water surface elevations and flood plain boundaries are often revised by road and bridge construction, flood plain de- velopment, flood control improvements, or natural processes. Prior to utilization of this report for planning or design pur- poses, the user is advised to contact the Urban Drainage and Flood Control District or the Colorado Water Conservation Board to determine if the information in this report has been amended. The study area includes the reach of the South Platte River lying within Adams County. This area extends from Franklin Street on the south to Base Line Road on the north and is generally bounded on the east and west sides by Brighton Road and Riverdale Road. The study area also includes a short reach of Sand Creek from the Burlington Canal down to the confluence with the South Platte River. The report was prepared by Gingery Associates, Inc., Consulting Engineers, Englewood, Colorado, at the request of the Urban Drainage and Flood Control District. Survey control data for the study reach from 1-270 to the Adams/Weld County line was collected and compiled by Merrick and company. The topograph- ical mapping for this reach was prepared by Merrick and Company of Denver, Colorado. The survey control data and mapping for the study reach from 1-270 to the Adams/Denver County line was collected and compiled by Bell Surveying Company and Bell Mapping Company, respectively of Denver, Colorado. The South Platte River has its source in the high mountainous terrain of the Front Range of the Rocky Mountains along the Continental Divide near Leadville, Colorado. Tributary basins begin as narrow valleys and canyons in the mountainous areas and increase progressively in width toward the lower basin areas on the eastern plains. The South Platte River flows through Adams County in a meandering channel confined along some reaches by levees. Basin elevations range from 14,200 feet MSL at the Continental Divide to. approximately 4950 feet MSL at Base Line Road, the Adams/Weld County Line. The South Platte River basin drains approximately 4900 square miles at Base Line Road. Acknowledgments In the reach of the South Platte River lying in Adams County, development in the flood plains is primarily agricultural with occassional sand and gravel mining operations. In the reach from 1.-270 tn Franklin Street, flood plain development consists of meat processing plants, truck farms and the Metropolitan Denver Sewage Treatment Plant. Photographs of the June, 1965 and May, 1973 floods were provided by the Denver Post newspaper and Hotchkiss, Inc. of Denver, Colorado. This report provides supplemental information v to the Flood Insurance Study for Adams county, prepared for the Federal Insurance Administration. v.