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FLOOD INSURANCE STUDY 1.0 INTRODUCTION '.. 1.1 Purpose of Study .. The purpose of this Flood Insurance Study is to investi- gate the existence and severity of flood hazards in Arapahoe County, Colorado, and to aid in the admini- stration of the Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. Initial use of this information will be to convert Arapahoe County to the regular program of flood insurance by the Federal Insurance Administration. Further use of the informa- tion will be made by local and regional planners in their efforts to promote sound land use and flood plain development. 1.2 Coordination The Arapahoe County Planning Department supplied zoning and corporate boundary maps for areas throughout the county. Conferences were held with the county staff on June 5, 1975, July 15 and 24, 1975. The final community coordination meeting was held on September 16, 1975. 6 The U. S. Army Corps of Engineers, Omaha District, supplied base mapping, hydrology input, and information on Chatfield Dam for the study reach of the South Platte River. In addition, conferences were held with the U. S. Army Corps of Engineers District Office in Omaha, on October 16, 1974, November 27, 1974, and March 21, 1975. Of particular significance to this study was the Flood Plain Information Study, Denver Metropolitan Region, Colorado, Volume IV by the U. S. Army Corps of Engineers, dated October 1968 and Special Flood Hazard Report to revise Flood Plain Information - Metropolitan Regio::1, Denver, Colorado, Volume II by the U.S. Army Corps of Engineers, dated, July 1971 (References 1 and 2). The U. S. Geological Survey (USGS) was contacted to obtain historical flow data (References 3, 4 and 5). Maps of floodprone areas, prepared by the USGS, showing approximate flood plain delineations at a scale of 1:2400 were also reviewed (Reference 6). Q .... -~