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12.B.The storm drainage system consists of pipes, fittings, catch basins, area drain and is intended for getting rid of water from the building roof and its surrounding and is conveyed to the street sewer.

13.C.In plumbing, a trap is a U-shaped portion of pipe designed to trap liquid or gas to prevent unwanted flow; most notably sewer gases from entering buildings while allowing waste materials to pass through

Explanation:

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