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Design Engineering Report: Avon Exhibit 1
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Design Engineering Report: Avon Exhibit 1
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Last modified
1/26/2010 4:41:44 PM
Creation date
7/30/2009 11:37:56 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8230.31B7
Description
Exhibits
State
CO
Basin
Colorado Mainstem
Water Division
4
Author
Jason Carey
Title
Design Engineering Report: Avon Exhibit 1
Water Supply Pro - Doc Type
Court Documents
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Design F,n;in4er•lng Repor•t. (.'r.rse No.200:5-0W =' .58 <br />Town of =lvon's Reerealional /rr-C'hanne! L)irersii,ri rR/(,DI R'aler Right irt 1he Eagle River <br />features where they can learn and practice new skills. The limiting factor for a <br />reasonable recreational experience with this group, is the depth of channel adequate for <br />tipping over. At a flow of 200 cfs the depth at the designed Baby Bob feature is 3.1 feet <br />on average. The November 21, 2003 RICD Technical Criteria suggest a minimum depth <br />of 3-3.3 ft. Baby Bob is designed to provide an efficient hole feature at the minimal flow <br />that maintains adequate depths. <br />The season of kayaking is anytime that the channel is not obstructed by ice and there is <br />sufficient water. Typically the warm-up season is in April and May on the rising limb of <br />the hydrograph. Advanced freestyle season is around the peak in late May or June. As <br />the runoff recedes the water warms and the intermediate and beginning freestyle paddlers <br />are more active. When the channel drops to levels less than those claimed for the RICD, <br />paddling is not popular on this reach. <br />VI. Permits <br />Avon has applied for all of the necessary permits for this project, and two permits have <br />been issued. Avon filed an application for a Corps of Engineers 404 individual permit <br />(COE 2006-75059) on January 23, 2006. The Corps of Engineers received comments <br />from the EPA and the DOW, and Avon has responded to both comments. Avon <br />anticipates the 404 Permit will be issued shortly. Avon also applied for a Department of <br />Public Health and Environment 401 Water Quality permit (CO Certificate No. 4113) and <br />an Eagle County Floodplain Development Plan permit (Permit No. 2006-002), both of <br />which have been issued. <br />VII. Floodplain Compliance <br />The proposed project does not result in increases of the Base Flood Elevations as <br />published in a Floodplain Information Report (FIR) dated August 22, 2003, that was <br />prepared by Matrix Design Group for Eagle County and the Colorado Water <br />Conservation Board. The FIR is the most current floodway information available for the <br />Eagle River (2003). The FIR presents Base Flood Elevations (BFE) through the project <br />site based on use of the HEC-RAS floodway model developed by the U.S. Army Corps <br />of Engineers (USACE, 1997). <br />As applied to the Eagle River, the HEC-RAS model used in the 2003 FIR represents six <br />channel cross-sections over the project reach to describe channel geometry. To evaluate <br />potential effects of the Avon RICD structures on flood profiles for the Eagle River, three <br />additional control cross-sections were added to the existing HEC-RAS model based on <br />field surveys conducted in 2005 and the proposed RICD design. These additional cross- <br />sections represent the physical changes to the channel geometry that would result from <br />construction of the RICD structures. The HEC-RAS model was then run with the <br />additional cross-sections ("Eagle_River Bob Design") and results were compared to the <br />original model results ("Eagle_River"). The HEC-RAS model results (Table 2) indicate <br />4 of 11 <br />? I ? E R Junc 2O(IG <br />'? ' '' <br />??? PC? Bo? 7.1_3 GIemF<?od $??tiur?s Cblur,ido S 16(1? ('1?0) 9d7-9it.$
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