Solving for area of opening.

Note: equation applies to flow depths greater than 1.4 the opening height

capture flow rate (Q _{i})= 0 = 0 foot^3/second |

acceleration of gravity (g) = 0 = 0 foot/second^2 |

flow depth (d) = 0 = 0 foot |

height of opening (h) = 0 = 0 foot |

area of opening (A) = NOT CALCULATED |

Select to solve for a different unknown

curb type gutter

gutter flow rate | |

Manning's coefficient | |

roadway cross slope | |

longitudinal slope | |

flow width |

curb opening inlet with weir operation

capture flow rate or interception capacity | |

curb opening length | |

curb opening width | |

flow depth at curb |

curb opening inlet with weir operation

no depression

no depression

capture flow rate or interception capacity | |

curb opening length | |

depth of flow |

curb opening inlet with orifice operation

capture flow rate or interception capacity | |

curb opening area | |

acceleration of gravity | |

flow depth at curb | |

opening height |

gutter opening inlet

capture flow rate or interception capacity | |

grate perimeter | |

flow depth |

slotted pipe drain inlet

pipe length for complete interception | |

flow rate | |

longitudinal slope | |

Manning's coefficient | |

roadway cross slope |

gutter capture efficiency

gutter capture efficiency | |

capture flow rate | |

total flow rate |

gutter carryover or bypass

gutter carry over or bypass | |

total flow rate | |

capture flow rate |

Where

Q | = | gutter flow rate |

n | = | Manning's coefficient |

S_{x} | = | roadway cross slope |

S | = | longitudinal slope |

T | = | flow width |

d | = | flow depth at curb |

a | = | depressing depth |

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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