Pump Head vs Speed and Diameter (\( \frac{H1}{H2} = \left(\frac{N1^2}{N2^2}\right) \left(\frac{D1^2}{D2^2}\right) \)):

Where:

• \( H1 \) is the initial pump head, in feet.
• \( H2 \) is the final pump head, in feet.
• \( N1 \) is the initial pump speed, in rpm.
• \( N2 \) is the final pump speed, in rpm.
• \( D1 \) is the initial pump diameter, in inches.
• \( D2 \) is the final pump diameter, in inches.