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FLOOD INSURANCE STUDY CITY AND COUNTY OF DENVER, COLORADO 1.0 INTRODUCTION 1.1 Purpose of Study This Flood Insurance Study (FIS) revises and updates a previous FIS/Flood Insurance .'- Rate Map (FIRM) for the City and County of Denver, Colorado. This information will be used by the City and County of Denver to update existing floodplain regulations as part of the Regular Phase of the National Flood Insurance Program (NFIP). The information will also be used by local and regional pla1ll1ers to further promote sound land use and floodplain development. In some States or communities, floodplain management criteria or regulations may exist that are more restrictive or comprehensive than the minimum Federal requirements. In such cases, the more restrictive criteria take precedence and the State (or other jurisdictional agency) will be able to explain them. 1.2 Authority and Acknowledgments The sources of authority for this FIS are the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. The hydrologic and hydraulic analyses for this study were performed by Gingery Associates, mc., for the Federal Emergency Management Agency (FEMA), under Contract No. 11-4549. This study was completed in June 1981. Revised hydraulic analyses for Clear Creek, Bear Creek, and Weir Gulch were performed by Dames & Moore for FEMA under Contract No. C-0542. Revised hydraulic analyses for the South Platte River were provided for FEMA by the Urban Drainage and Flood Control District (UDFCD) and were completed in September 1987. Revised hydraulic analyses for Weir Gulch, Weir Gulch Dakota Avenue Tributary, and Coon Creek were performed by Love and Associates, Inc., and Drexel Barrell Engineers/Surveyors, Inc., and completed in June 1989. Revised hydraulic analyses for Marston Lake North were performed by WRC Engineering, Inc., and Rocky Mountain Consultants, Inc. (RMC), and completed in October 1989. 1