Nozzle Diameter (\( D_n \)):

\[ D_n = 0.54 \cdot \frac{\sqrt{Q}}{H^{0.25}} \]

Where:

• \( D_n \) is the nozzle diameter, in meters (m).
• \( Q \) is the water flow rate, in cubic meters per second (m³/s).
• \( H \) is the head, in meters (m).