How is a head measurement of 11.55 feet converted to psi?

To convert a head measurement in feet to pressure in pounds per square inch (psi), you can use the conversion factor that 1 foot of water head is approximately equal to 0.433 psi. This means you would multiply the head measurement by this conversion factor to find the equivalent pressure in psi.

In this case, you would take the head measurement of 11.55 feet and multiply it by 0.433 psi/foot:

[

11.55 , \text{feet} \times 0.433 , \text{psi/foot} \approx 5 , \text{psi}

]

This calculation shows that a head measurement of 11.55 feet converts to approximately 5 psi, making this the correct answer. Understanding this conversion is crucial in irrigation, as it helps determine the appropriate pressure needed for efficient water application in various systems.