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10.2 Second Revision This study was revised on March 2, 1993, to reflect the effects of the recent urban developments and associated improvements along Cherry Creek. These improvements consist of the following: New bridges: Cottonwood Drive bridge Lincoln Avenue bridge E-470 bridges Bridge replacements: West Parker Road bridge Stroh Avenue bridge Urban developments: Parker Station Subdivision Parker Water and Sanitation District treatment plant expansion Cherry Creek was reanalyzed from the Arapahoe/Douglas County line to a point approximately 2,100 feet above Stroh Avenue bridge. The revised reach passes through both the Town of Parker and the unincorporated areas of Douglas County. The revised hydraulic analysis for this reach was based on a restudy performed by CRB Engineering, Inc., Lakewood, Colorado, which utilized the Corps of Engineers' HEC-2 step-backwater computer program. The study is presented in a technical report, entitled "Request for Map Revision for Cherry Creek at Parker," dated April 1991 (Reference 22). As a result of this study the base (loo- year) flood elevations both decreased and increased throughout the revised reach, and 100- and 500-year floodplain and 100-year floodway boundaries were also revised. Topographic maps at a scale of 1"=400' and a contour interval of 4 feet, produced by the Urban Drainage and Flood Control District and revised by Falcon Air Maps on May 18, 1990, (Reference 22) were utilized to produce the new boundaries as shown on the revised Flood Insurance Rate Map Panels 0070 Band 0185 A. These Flood Insurance Rate Map panels also show the new corporate limit boundaries for the Town of Parker, Colorado. Flood Profile Panels 01P through 06P were replaced with revised Profile Panels 01P through 09P, and F100dway Data was revised to reflect the effect of this study. The Summary of Discharges was also revised to show flows at new road crossings. 20 '?,i~