FHWA Orifice Outlet Control Required Area Calculator
Calculate the required orifice area for an FHWA Orifice Outlet Control with free discharge.
Using: \(\displaystyle A = \frac{Q}{C_d\sqrt{2\,g\,H}}\)
* Enter the design flow rate \(Q\) (cfs), head \(H\) (ft), and discharge coefficient \(C_d\). Gravitational acceleration \(g\) is taken as 32.2 ft/s².
Step 1: Enter Parameters
Example: 10 cfs
Example: 3 ft
Example: 0.62
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