Gravity Pipe Flow Calculator Hot! Jun 2026

A 12-inch diameter concrete storm drain is laid at a 0.5% slope. It flows 80% full. Find the flow rate.

Flow rate ≈ 6.7 cubic feet per second (≈ 3000 gpm) Velocity ≈ 5.3 ft/s (good – above self-cleansing minimum of 2 ft/s) gravity pipe flow calculator

The gravity pipe flow calculator is a user-friendly tool that can be used to optimize the design of gravity-driven pipe systems, ensuring efficient and safe operation. The calculator can also be used to analyze existing systems, identifying potential problems and opportunities for improvement. A 12-inch diameter concrete storm drain is laid at a 0

The gravity pipe flow calculator is based on the following equations: gravity pipe flow calculator