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

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Two roof drains each serve 2,000 square feet at 4 inches per hour (83.2 gpm each). Their leaders combine into one horizontal storm drain sloped 1/4 inch per foot. What is the smallest Table 1106.2 size for that combined drain?

3 inches (79 gpm at 1/4 in/ft) 4 inches (163 gpm at 1/4 in/ft) 5 inches (234 gpm at 1/4 in/ft) 6 inches (487 gpm at 1/4 in/ft)

Correct Answer:

5 inches (234 gpm at 1/4 in/ft)

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