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FWOD 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 Rate Map for the City of Rifle, Garfield County, Colorado. This information will be used by the City of Rifle 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 precedence and the State (or other juris- dictional 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 196B and the Flood Disaster Protec- tion Act of 1973. The hydrologic and hydraulic analyses for this study were performed by the U.S. Army Corps of Engineers, Sacramento District, for FEMA, under Inter-Agency Agreement Nos. lAA-H-16-75 and lAA-H-7-76, Project Order Nos. 20 and 1, respectively. Revised hydrologic and hydraulic analyses for Rifle and Government Creeks and Hubbard Gulch along with new hydrologic and hydraulic analyses for Helmer and Ramsey Gulches were performed by Simons, Li & Associates, Inc., for FEMA, under Contract No. EMW-C-0942. This study was completed in December 19B3. 1.3 Coordination Streams requiring detailed study were identified at a meeting attend- ed by representatives of the study contractor, FEMA, and the city in June 19B 2. In August 1983 the results of the study were reviewed at an intermediate coordination meeting attended by representatives of the study contractor, FEMA, the Colorado Water Conservation Board (CWCB), and the city.