Design Data 11: Hydraulic Capacity of Culverts
The most widely accepted formula for evaluating the hydraulic capacity of non-pressure sewers is the Manning Formula.
- Q = discharge in cubic feet per second
- n = Manning’s roughness coefficient
- A = cross-sectional area of flow in square feet
- R = hydraulic radius in feet (equals the area of the flow divided by the wetted perimeter)
- S = slope of pipe line in feet of vertical drop per foot of horizontal distance
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