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plain areas those areas inundated by the lOa-year flood* as defined by the water surface elevations and profiles. Land uses in designated flood plain areas may then be regulated by the local government. Purpose and Scope This report was prepared to guide local officials in the planning~ use and regulation of the flood plain as designated, so that flood hazards and future flood damages are minimized. The report inclues information on historical floods and the nature and extent of probable future floods. The report data includes Flooded Areas maps delineating the lOa-year flood boundary and floodway, flood profiles and flood plain cross-sections showing the high water elevations for the 10-, 50-, 100- and 500-year floods at selected reference points. This information is contained in Volume II of this report which is pr~nted separately. Acknowledgements The assistance and cooperation of various governmental agencies, organizations and individuals permitted the expeditious completion of this report. Those organizations are listed on the following page and their assistance is gratefully appreciated and acknowledged. "The terms "Intermediate Regional Flood", "lOa-year flood", and "one percent flood" can be used interch<Ulgeably as they ar", dll defined by the same flood event. -2- Federal Insurance Administration Colorado Water Conservation Board Larimer County Planning Department U. S. Department of the Interior, Geological Survey Colorado State Highway Department Soil Conservation Service U. S. Army Corps of Engineers, Omaha District Colorado State University United States Bureau of Reclamation Big Thompson Recovery Planning Council I I I I , . Maps and Surveys The contour maps on which the flood plain is delineated were prepared by Kucera & Associates, Inc. under a separate contract with the Colorado Water Conservation Board. Two-foot and ten-foot contour interval maps were prepared photogrammetric- 31ly from aerial photos taken September 5, 1976. The maps were compiled at a scale of 1" = 100' and rl1!duced to a scale of 1" = 200' for the flOOd plain delineation. The maps are specified to meet or exceed National Map Accuracy St(lndards. The cross-sections used in the hydraulic analyses were obtained from the aerial topography utili~ing photogrammetric methods. Major road and highway bridges were measured and field surveyed by Gingery Associates, Inc. Previous Studies The U. s. Army Corps of Engineers. Omaha District, -3-