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Calculate Discharge from an (FHWA) Orifice Outlet Control With Free Discharge:

Calculation:

Designer/Checker:

Input:

Metric Units

(Note: All input Metric units are converted to English units for the equations below and then the output English units are converted back to Metric)

Area of orifice (Ao - SF or m^2)

Water surface elevation at design volume (Es - ft or m)

Elevation of centroid of orifice opening (Eo - ft or m)

Orifice Coeficient (Co)

Typical values for Co: Range from 0.40 to 0.60
Rough edges - torch cut: Co = 0.40
Smooth squared edges: Co = 0.60

Output:

Discharge, Q =