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 Page 23 Upper and Lower Emerald Valley Dam Failure Report <br /> January 23, 2015 <br /> <br /> Figure 29: Schematic Profile View of Keeton Access Bridge <br />To estimate the flow that could pass beneath the bridge chord, the software program <br />Bentley Flowmaster was utilized. Inputs for channel slope and bridge chord elevation <br />were known and a Mannings n, roughness coefficient, of 0.105 was utilized. It is <br />estimated the bridge can pass about 506 cfs below the bridge chord, as shown below. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Figure 30: Flowmaster estimate of Channel capacity <br />BELOW bridge Chord <br />Figure 31: RR Tie Bridge Channel Capacity, below bridge chord