Specific Speed (\( N_s \)):

\[ N_s = C \frac{N q^{1/2}}{h^{3/4}} \]

Where:

• \( N_s \) is the specific speed.
• \( C \) is a constant, 51.65.
• \( N \) is the impeller speed, in revolutions per minute (rpm).
• \( q \) is the flow rate, in cubic meters per second (m³/s).
• \( h \) is the head, in meters (m).