Sprinkler Discharge (\( q = 29.85 \times C \times d_n^2 \times P^{1/2} \)):

Where:

• \( q \) is the sprinkler or nozzle discharge, in gallons per minute (gpm).
• \( d_n \) is the diameter of the nozzle orifice, in inches.
• \( P \) is the pressure at the nozzle, in pounds per square inch (psi).
• \( C \) is the coefficient of discharge.