# Hazen-Williams Pipe Inside Diameter Equation

This inside pipe diameter formula is used in Hazen-Williams equations and the coefficient formula.

## Hazen-Williams Pipe Inside Diameter Equation formula

\(\large{ d = \left( \frac {Q}{ 0.285 \; C \; m^{0.54} } \right) ^{\frac {1}{2.63} } }\) |

### Where:

Units |
English |
Metric |

\(\large{ d }\) = inside diameter of pipe | \(\large{in}\) | \(\large{mm}\) |

\(\large{ Q }\) = flow rate | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) |

\(\large{ C }\) = Hazen-Williams coefficient | \(\large{dimensionless}\) | |

\(\large{ m }\) = hydraulic grade line slope | \(\large{ft}\) | \(\large{m}\) |

Tags: Pipe Sizing Equations Pipe Equations Hazen-Williams Equations