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eng.sewer-Manning-design Calculator
Calculates sewer pipe capacity and velocity using Manning's equation and checks against self-cleansing velocity requirement. Manning's n for smooth PVC pipe is 0.010; concrete is 0.013 — the 30% difference significantly affects pipe sizing.
Inputs
Q L S
Reference formula or conversion factor shown for context.
Slope Pct
Reference formula or conversion factor shown for context.
N Manning
Reference formula or conversion factor shown for context.
D Fill Ratio
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Results
required pipe diameter D (mm)
The computed diameter -- twice the radius.
full-flow capacity Qfull (L/s)
Reference formula or conversion factor shown for context.
d/D fill ratio design target
The proportional relationship between two quantities.