Solving for time of concentration.

watershed lag time (t _{L})= 0 = 0 hour |

time of concentration (t _{c})= NOT CALCULATED |

Select to solve for a different unknown

Izzard formula

time of concentration | |

overland flow distance | |

retardance coefficient | |

slope |

Kerby formula

time of concentration | |

flow length | |

retardance roughness coefficient |

Kirpich formula

time of concentration | |

travel length | |

slope |

Kinematic wave formula

time of concentration | |

overland flow length | |

Manning's overland flow roughness coefficient | |

rainfall intensity | |

average overland flow path slope |

National Resources Conservation Service

time of concentration | |

watershed lag time |

watershed lag time | |

watershed hydraulic length | |

potential watershed storage | |

average watershed slope |

Bransby Williams Equation

time of concentration | |

channel length | |

watershed area | |

linear profile slope |

References - Books:

Martin Wanielista, Robert Kersten and Ron Eaglin. 1997. Hydrology Water Quantity and Quality Control. John Wiley & Sons. 2nd ed.

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