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. , " ", . . '. '. FLOOD INSURANCE STUDY BOULDER COUNTY (UNINCORPORATED AREAS), COLORADO 1.0 INTRODUCTION 1.1 Purpose of Study This Flood Insurance Study report revises and updates a previous Flood Insurance Study/Flood Insurance Rate Map for the unincor- porated areas of Boulder County, Colorado. This information will be used by Boulder County 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 planners 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 National Flood Insurance Protection Act of 1973. for thi s Flood Insurance Study are the Act of 1968 and the Flood Disaster The hydrologic and hydraulic analyses for the original study were performed by the U.S. Soil Conservation Service (SCS) for the Federal Emergency Management Agency (FEMA), under Inter-Agency Agreement No. lAA-H-16-72, Project Order No. S. That work, which was completed in August 1974, covered all signi ficant flooding sources affecting Boulder County. The revised hydrologic and hydraulic analyses for this study were performed by various engineering firms, for the purposes of floodplain evaluation and are discussed in Section 6.0 1.3 Coordination During the preparation of the original study, the following were contacted: U.S. Army Corps of Engineers (COE), Omaha District; U.S. Geological Survey (USGS), Water Resources Division, Colorado District Office; U.S. Weather Bureau; Denver Regional Council of Governments; Urban Drainage and Flood Control District (UDFCD); Colorado Water Conservation Board (CWCB), Boulder County; and City of Longmont. The final coordination meeting for the original study was held on July 13, 1976, and attended by representatives of FEMA, the study contractor, and the county. Comments from county officials and citizens were taken into account.