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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />- <br /> <br />Average Slope - 0.66% - average from a point 13,000 feet below the <br />3400 Road Bridge at the Town of Hotchkiss to the 4175 Road Bridge <br />upstream of the Town of paonia. <br /> <br />Depth of 100 year flood from centerline of channel - 6 to 9 feet <br /> <br />. Width and depth of channel to maintain a 100 year flood of 12,200 <br />cfs at the average slope (from Mannings Formula). <br /> <br />Channel <br />Depth <br /> <br />Channel <br />Width <br /> <br />6 <br />7 <br />8 <br />9 <br /> <br />210 <br />165 <br />135 <br />114 <br /> <br />Comparison of cross sections at each depth of reaches along river, <br />an average of 20 cubic yards per foot must be moved. <br /> <br />Comparative Costs <br /> <br />Case 1 If the entire reach was channeled to fit the above <br />applicable cross section: <br /> <br />76,275 ft x 20 yd3/ft = 1,525,500 yd3 <br />1,525,500 yd3 x $3/yd3 = <br /> <br />$ 4,576,500 <br /> <br />Case 2 - Based on the field surveys <br />channel only has to be cleared <br />protect specific critical areas: <br /> <br />and aerial photographs the <br />in certain reaches in order to <br /> <br />21,000 ft of heavy clearing <br />26,000 ft of light clearing <br />21,000 ft x 20 yd3/ft = 420,000 yd3 <br />26,000 ft x 10 yd3/ft = 260,000 yd3 <br /> 680,000 yd3 <br /> <br />680,000 yd3 x $3/yd3 = <br /> <br />$ 2,040,000 <br /> <br />C-6 <br />