The formula to calculate the Horsepower (HP) is:
\[ HP = \frac{GPH \cdot P}{1714 \cdot E} \]
Where:
Let's say the gallons per hour (GPH) is 500, the pressure (P) is 100 psi, and the pump efficiency (E) is 0.85. Using the formula:
\[ HP = \frac{500 \times 100}{1714 \times 0.85} \]
We get:
\[ HP \approx 34.29 \, \text{HP} \]
So, the horsepower required is approximately 34.29 HP.