Figure 15 Mean-section method
Where:
V = velocity at vertical
b = distance to vertical from bank
h = depth at vertical
q = flow at vertical
The Mid-section method also divides the cross-section into individual flow segments. With the Mid-
section method, the segments are not between verticals but are defined by half of the distance to
neighbor verticals in each case. For this reason, the first and last verticals should be as near to the
edges as possible (i.e., left edge of water (LEW) and right edge of water (REW)). Boundary
conditions dictate the proximity of the first and last vertical to the edge of water.
Experience shows that the Mid-section method gives more exact results compared to the Mean-
section method so it is the default setting. Figure 16 shows the definitions and equation for the Mid-
section method.
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