Orifice Outlet Control Required Area Calculator

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

Design Flow Rate, \(Q\) (cfs):

Example: 10 cfs

Head, \(H\) (ft):

Example: 3 ft

Discharge Coefficient, \(C_d\):

Example: 0.62

Step 1: Enter Parameters

Calculated Orifice Area