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East Jordan, MI 49727
800.874.4100

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Orifice Flow Calculator


Options:
Enter A and d, solve for Q (flow)
Enter Q and d, solve for A (grate open area)

* = Required Fields
Open area of grate (in²) (A):
* Depth of water over grate (in) (d):
Flow (ft³/s) (Q):

Orifice Equation

The flow capacity of any inlet grate in a sump or ponded condition is a function of the depth of water over the grate and the open area of the grate. For this calculation, the orifice equation is used. The orifice equation can be used to determine the flow through a grate.

Q = 0.0108 A√ d 

Q = flow (ft³/s)
A = open area of grate (in²)
d = depth of water over grate (in)

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