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Work to date <br />Preliminary surveys haw been conducted to aid in the hydraulic design of the channel. Due to river <br />levels it was not possible for extensive surveys. When river levels rise and a boat can be used, the <br />surveys will be completed. <br />Pebble counts were conducted to determine the D84 size used in the determination of Manning's n. <br />Calculations indicate an n value of 0.038 at the Section 4 cross section of 0.038, consistent with 0.04 <br />reported by Ward and Elliot (Environmental Hydrology 1995) for cobble bottomed mountain rivers. <br />Bank -full flow was determined to be 12,700cfs based on gage data and a 1.5 year reoccurrence interval. <br />Gage data, pebble counts, and reoccurrence intervals used to design the proposed channel are <br />presented in the following pages. <br />Additional analysis will continue during construction and presented in a summary report to the USACOE <br />after the projec` S completed. <br />35000 <br />30000 <br />25000 <br />20000 <br />15000 <br />10000 <br />5000 <br />0 <br />1 <br />Reoccur ence Interval for Peak Flows based on <br />Glenwood Sprs. Gage <br />10 100 <br />Yearly Peak flows <br />—'F-- Series 1 <br />