Design Engineering Report: Avon Exhibit 1

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f)e.si,tM F?ktTirt4errr?,a Repa•1, C"usa A'r).'(ll) 5-{ Y1-?j,3 Toivn ofAvon'.s Rr°creationul In-Cdtunnel Divrrsiorl (R/M bl'ater Righ1 ir1 !he Eagle RivGr. 3. ERWSD Filtration Plant Raw Water Booster Pump 1,000 feet downstream (Alternate for Metcalf diversion) 4. Arrowhead Metro Diversion 3,000 feet downstream 5. ERWSD Wastewater Treatment Plant Return, 100 feet upstream of USGS 09067020 The Town of Avon anticipates working with the Water Commissioner for District 37 to determine the most appropriate method of ineasurement for administrative purposes. V. Minimal Flows Sought Three different levels of recreation experience are sought for three different periods. The levels of recreation sought are beginning whitewater freestyle, intermediate whitewater freestyle and advanced whitewater freestyle. Freestyle kayaking has specific equipment, largely defined by a planing hull as opposed to the displacement hulls of slalom kayaks. Planing hulls have a flat bottom, and the sides come up from the bottom at a defined angle. When at rest, or when paddled very slowly, planing-hull boats plow through the water. When the boat is given some speed, the flat surface skims to the water's surface, and allows the boat to spin and the paddler to perform tricks. Advanced freestyle kayak paddlers require a wave that would allow a boat to hydroplane on the water, this is the initiation for all aerial maneuvers. There is a natural, existing wave at the location of Bob Sr. that provides advanced whitewater freestyle recreation at approximately 3,500 cfs. The proposed designed structure at Bob Sr. modifies the existing wave to create the intended recreational experience at a lower rate of flow. The proposed Bob Sr. design efficiently maximizes the local hydraulics without increasing the Base Flood Elevations. To have this reasonable recreation experience, a minimum flow of 1,400 cfs at Bob Sr. is required. Bob Sr. would also have the potential to be a rodeo venue. It is desired to achieve this level of experience because of the publicity and economic impact of festivals and competitions. Having a feature that attracts world-class competitors to festivals and competitions enhances the economic benefits to Avon. Intermediate freestyle kayakers have been another key focus of the Avon whitewater improvements. Intermediate freestyle kayakers have advanced boating skills and are performing stunts in their boats. It is more important for the intermediate reasonable recreation experience to have an extended season duration than a short extreme peak. A wave hole feature that provides hydroplaning and a foam pile is the attraction for intermediate freestyle kayakers. The Bob Jr. feature is designed to provide the reasonable recreation experience of a wave hole at a minimum flow of 350 cfs and thus to efficiently persist for a sufficient period of the hydrograph. Beginning freestyle kayaking is a level that occurs when a kayaker has obtained enough skill to maneuver in the river. 'This level of recreational boating is most impacted by depth for rolling or wet exiting. This group of paddlers are entertained by gentler 3 of 11 I V E R .,une 2006 /? ? ' . . . . ?00,? PO Boti 2123 Gle!m ood Sprin?; C'oicrrido $ I6U2. (970) 9-{7-95oS