Hydraulics and Fluid Mechanics Formulas

Solving for flow mean velocity

Note: Valid only for ambient temperatures and turbulent flow

Hazen Williams friction coefficient (C)

= 0

= 0

hydraulic radius (r)

= 0

= 0

foot

hydraulic grade line slope (s)

= 0

= 0

flow mean velocity (v)

= NOT CALCULATED

Select to solve for a different unknown

Mean Fluid Velocity

mean flow velocity | |

friction coefficient | |

hydraulic radius | |

hydraulic grade line slope |

Fluid Flow Rate

discharge or flow rate | |

friction coefficient | |

pipe diameter | |

hydraulic grade line slope |

Where

v | = | mean flow velocity |

C | = | Hazen Williams friction coefficient |

r | = | hydraulic radius |

s | = | hydraulic grade line slope |

Q | = | flow rate or discharge |

D | = | pipe diameter |

Reference - Books:

1) P. Aarne Vesilind, J. Jeffrey Peirce and Ruth F. Weiner. 1994. Environmental Engineering. Butterworth Heinemann. 3rd ed.

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