The water level of a reservoir is 150 feet above a fire hydrant. What is the static reading at the hydrant?

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Prepare for the Ben Hirst Fire Apparatus Driver and Operator Exam 1. Utilize flashcards and multiple choice questions, each with hints and explanations. Ace your exam!

Multiple Choice

The water level of a reservoir is 150 feet above a fire hydrant. What is the static reading at the hydrant?

Explanation:
Static pressure at the hydrant comes from the hydrostatic head of the water column above it. The hydrant experiences the weight of 150 feet of water, so convert that height to pressure: about 0.433 psi per foot of water, giving 150 × 0.433 ≈ 64.95 psi. That rounds to about 65 psi, which matches the stated answer. (Note: dynamic pressure under flow would be lower due to friction, but static pressure reflects the vertical head.)

Static pressure at the hydrant comes from the hydrostatic head of the water column above it. The hydrant experiences the weight of 150 feet of water, so convert that height to pressure: about 0.433 psi per foot of water, giving 150 × 0.433 ≈ 64.95 psi. That rounds to about 65 psi, which matches the stated answer. (Note: dynamic pressure under flow would be lower due to friction, but static pressure reflects the vertical head.)

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