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I I PREFACE information on past floods and the nature and extent of probable future floods along the study reaches. The 100-year flood should be given appropriate consideration before planning for development in flood prone areas. I Authorization: I The 100-year floodplain is shown on the Flood Hazard Area Delinea- tion Maps (Sheets 2-34) which indicate the areas that would be inun- dated by this flood event. Flood profiles (Sheets 2-34) show the water depths in the channels during the occurrence of the 100-year flood event. Water surface elevations are provided at each channel cross-section in Tables 1-7. Valley cross-sections are plotted on the profile sheets at selected locations showing the water depths during the 100-year flood event. The flood profiles and flooded area data presented are based on existing channel conditions. Possible future improvements to control floods are not a consideration in the develop- ment of the information in this report. I This report was authorized by the Urban Drainage and Flood Control District (UD&FCD). At present, the District joins with local com- munities to make floodplain information and mapping available for local governments to adopt and administer their own floodplain regula- tions with the assistance of the District. The cities, incorporated towns, and counties within the study area may adopt these zoning regulations, I I I to establish, regulate, restrict and limit such uses on or along any storm or floodwater runoff channel or basin, as such storm or floodwater runoff basin has been designated and approved by the Colorado Water Conservation Board, in order to lessen or avoid the hazards to persons and damage to property resulting from the accumulation of storm or floodwaters. as stated in Section 30-28-201 for county governments and Section 31- 23-201 for municipal governments of the Colorado Revised Statutes 1973. The information in this report does not imply any state action to zone or regulate use of floodplains. The district has the authority to regulate floodplains, but to date has chosen to leave floodplain regulation responsibility with local governments. The report provides a suitable basis for the adoption of land use controls to guide floodplain management, with consideration for environmental attri- butes, and thereby prevents intensification of flood losses. I I I I I Upon acceptance of this report by the Urban Drainage and Flood Control District and the designation and approval of this report by the Colorado Water Conservation Board, the areas described as being inundated by the 100-year flood may be designated as flood hazard areas and their use regulated accordingly. Flood water surface elevations and floodplain boundaries are often revised due to road and bridge construction, floodplain development, flood control improvements or natural processes. Before utilization of this report for planning or design purposes, the user is advised to contact the Urban Drainage and Flood Control District to determine if the information in this report has been amended. I I I Purpose and Scope The primary objective of this study is to prepare floodplain maps so that Jefferson County can implement, as needed. floodplain zoning ordinances and other land use controls to reduce potential flood damages and unwise development in the floodplain. The report includes Acknowledgements This report was prepared by PRC Engineering Consultants, Inc. (PRC/ECI) of Englewood, Colorado, for the Urban Drainage and Flood Control District. The topographic maps used in this study were prepared by Landmark Mapping Company of Denver, Colorado, except for maps of the reaches of Bear Creek and Mount Vernon Creek through I I -1- I