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Manning s Equation <br />1.49 A. 1 <br />Q; = n p S2A, <br />S = River slope =1.3% <br />A; = Flow cross sectional area of subsection i <br />P; = Wetted perimeter of subsection i <br />n; = Manning's number for subsection i <br />Cliff Slope <br />1 <br />Dike Slope <br />3A--- . Area <br />K <br />Figure 3 -100 Year Event Cross Section <br />The sum of the separate area flows must be roughly equal to the FEMA 100 Year event flow. <br />The individual flows were calculated via a common depth applied to the wetted perimeters and <br />areas of each subsection. The results of the subsection calculations and the resulting flow total is <br />shown in Table 3. <br />Composite Flow <br />5 <br />QTowj = Q; =12,200 cfs <br />:=t <br />The number S denotes the total number of area segments in the river channel. <br />Tri County Dike Slope Stability Jan 08 <br />10