Pipe B (2,655 ft, 1.5 ft diameter) alone contributes approximately how many gallons?

• A. 50,000 gallons
• B. 35,000 gallons
• C. 3,500 gallons
• D. 350,000 gallons

Answer: (B)

This question tests how to find the stored volume of a cylindrical pipe and convert that volume to gallons. The volume of a cylinder equals the cross-sectional area times the length. With a diameter of 1.5 feet, the radius is 0.75 feet, so the cross-sectional area is πr^2 = π(0.75)^2 ≈ 1.767 square feet. Multiply by the length: 1.767 ft^2 × 2,655 ft ≈ 4,692 cubic feet. To convert to gallons, use 1 cubic foot ≈ 7.4805 gallons, giving 4,692 × 7.4805 ≈ 35,100 gallons. The closest approximation is about 35,000 gallons.