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e g Ii' ~ ~---- The Buffalo Creek drainage, west of Denver, ~ \.(blhe Big Thompson drainage, between Loveland and Estes Park and .,- ~--1filhe Crow Creek drainage, in Cheyenne, Wyoming. There is no statistical reason that the described high-intensity storm event cannot occur in the Dry Creek Basin. City and County personnel believe that if a similar storm were to happen in the Dry Creek drainage without implementing one of the structural projects outlined in this report that the damage would be almost as severe as the Spring Creek flood. STUDY OBJECTIVE The study objective is to examine the preliminary engineering, economic, institutional, permitting, and financial feasibility of a Dry Creek Flood Control Project. Furthermore, this study presents an environmental assessment program for the project. The purpose of the study is to identify feasible alternatives for a structural project and describe them for evaluation by the Larimer County Board of Commissioners and the Fort Collins City Council. Ultimately, these two governing bodies will choose the Alternative which will be taken to construction and successful implementation. e One criterion used for identifying the Selected Alternative will be how it addresses local and regional flooding issues identified by the City, County, and affected irrigation companies, see Appendix A through C. Other criteria to be used in the selection process include environmental issues, cost effectiveness of the project, private property impacts, the amount ofland required, constructability, and the amount of maintenance. BACKGROUND OF THE DRY CREEK FLOOD CONTROL PROJECT In February 1996, the Fort Collins City Council and the Larimer County Board of Commissioners foresaw the need for a solution to drainage problems in northeast Fort Collins and directed staff to pursue a comprehensive solution to flooding problems. In May 1997, the City and County agreed that the flood hazards presented by Dry Creek and the West Vine Drainage Basin were a priority and enacted an Intergovernmental Agreement for Stormwater Cooperation (lOA) to jointly pursue flood control solutions, see Appendix D. e The lOA identified two basins to be jointly addressed by the City and County. These were the Dry Creek Basin and the West Vine Basin. It was agreed between the City and County that the City would take the lead in the West Vine Basin and the County would take the lead in the Dry Creek Basin. Since that time, the County has formed a stormwater utility for the West Vine Basin, and a flood control project has been designed and constructed within the West Vine Basin. Subsequent to the enactment of the lOA, Larimer County chose to conduct a study that identified alternatives for flood control within the Dry Creek basin. The ability for a City or County to form a stormwater utility is governed by Colorado law under State Statutes #31-35-40 I and 402, and #30-20-400 respectively. 11