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<br />Bridge <br />Dimensions <br />Bottom width first design = 398 ft <br />Abutments will start at or slightly inside the <br />natural bank. <br />Number of piers, 3, <br />One pier is in center of the channel. <br />Spans between piers = 90, 110, 110, 90 ft <br />Distance from top of bank to bottom cord = 8 ft <br />Abutment is spill through with 1 to I slope. <br />piers are numbered from right to left from the right <br />bank (looking downstrean) <br /> <br />pier and footing geometry. <br />pier width = 3 ft <br />Pier length = 36 ft <br />Pier shape Round nose <br />Footing width = 7 ft <br />Footing length = 41 ft <br />Footing Elev, 2 ft below average strean bed elevation <br />after contraction scour, <br /> <br />Ql00 at Bridge <br />Discharge = 43,600 cfs, Manning n = 0,024 <br />Right abutment <br />Angle with channel = 800 <br />Left abutment <br />Angle with channel = 1000 <br />Pier 1 <br />Angle of attack = 00 <br />pier 2 <br />Angle of attack = 00 <br />pier 3 <br />Angle of attack = 50 <br />Channel conditions <br />Channel is straight upstream for 3,000 feet and down <br />stream for 4,600 ft of the bridge site. The bends <br />upstream and down are very mild so the flow through the <br />bridge and except for the returning flow on the left <br />side overflow area is fairly uniform. <br /> <br />63 <br />