SC Plumber Contractor Practice Questions - South Carolina Plumber Contractor Examination Exam

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The same 104 gpm roof drain is collected by a horizontal storm drain sloped 1/8 inch per foot. What is the smallest horizontal pipe Table 1106.2 permits?

3 inches (55 gpm at 1/8 in/ft) 4 inches (115 gpm at 1/8 in/ft) 5 inches (165 gpm at 1/8 in/ft) 6 inches (344 gpm at 1/8 in/ft)

Correct Answer:

4 inches (115 gpm at 1/8 in/ft)

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