Pump Impeller Diameter vs Head (\( \frac{D1^2}{D2^2} = \frac{H1}{H2} \)):

Where:

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