Calculators generally use one of two primary empirical equations: The Manning Equation
These calculators assume . Do not use if: gravity pipe flow calculator
Converted to Gallons Per Minute (GPM): $$1.4 \times 448.83 \approx \mathbf628 \text GPM$$ Calculators generally use one of two primary empirical
Sometimes used for full-pipe gravity flow (siphons) or pressurized systems, though Manning's is the standard for storm drains and sewers. gravity pipe flow calculator
The first step is determining if your pipe is flowing or partially full .