// multi-utility computation suite · offline · instant · precise
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eng.mannings-sewer-pipe Calculator
Calculates sewer pipe design flow and minimum slope using Manning's equation for full-pipe flow in circular sewers. Minimum self-cleansing velocity of 0.6 m/s at design flow requires minimum slopes of 1:100 to 1:400 depending on pipe diameter.
Inputs
D Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
S Pct
Reference formula or conversion factor shown for context.
N Coeff
Reference formula or conversion factor shown for context.
Depth Ratio
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Results
full-flow discharge Qfull (L/s)
Reference formula or conversion factor shown for context.
full-flow velocity Vfull (m/s)
Reference formula or conversion factor shown for context.