Water Main Sizing Calculator

Sizes water distribution mains for domestic and fire flow requirements using Hazen-Williams.

From demand calculations.
GPM
From fire flow calculator.
GPM
Distribution main length.
feet
Typically 5-10 fps.
ft/s
100-150 based on pipe material.

Results

Total Design Flow-GPM
Pipe Size (Velocity Limit)-inches
Pipe Size (Friction Loss)-inches
References: AWWA M31, Hazen-Williams Formula