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FLOOD INSURANCE STUDY 1.0 INTRODUCTION 1.1 Purpose of Study " This Flood Insurance Study has been prepared to revise and update a previous Flood Insurance Study/Flood Insurance Rate Map for the unincorporated areas of Larimer County, Colorado. This information will be used by Larimer County to update existing flood plain regulations as part of the regular program of flood insurance by the Federal Emergency Management Agency (FEMA). The information will also be used by local and regional planners to further promote sound land use and flood plain development. . In some states or communities, flood plain 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 pre~edence and the State (or other jurisdictional agency) will be able to explain them. 1.2 Authority and Acknowledgments The sources of authority for this Flood Insurance Study 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, Inc., for FEMA, under Contract No. H-4017. This study was completed in December 1977. The revised hydrologic and hydraulic analyses for Dry Creek were also performed by Gingery Associates, Inc" as reported in Maior Draina2ewav Plannin2. Drv Creek, Fort Collins. Larimer County, Colorado (Reference 1). This work was completed in February 1985. . The revised hydrologic and hydraulic analyses for Big Thompson River upstream of Lake Estes, Fall River, and Black Canyon Creek were performed by Simons, Li & Associates, Inc., for FEMA under Contract No. EKW-83-C-1167. This work was completed in April 1985. 1.3 Coordination The identification of streams requlrlng detailed study was accomplished at a meeting attended by representatives of the study cont~actor, FEMA, and the Larimer County Planning Department on April 20, 1976. After the Big Thompson River flood of July 31, 1976, the study scope was increased to include the Big Thompson Canyon area.