A bathroom group under the UPC consists of 1 water closet (1.6 gpf gravity tank, private), 1 lavatory (private), and 1 bathtub. What is the total DFU load, using UPC fixture-unit values?
Not quite. The answer is B: 6
Add the three table values: the private water closet is 3 DFU, the lavatory 1 DFU and the bathtub 2 DFU, for 6 DFU. The trap is treating the group as one lump value or mixing in the public-use column; on the exam you add each fixture from Table 702.1.
Reference: UPC 2021 Table 702.1 (Drainage Fixture Unit Values)
Checked against the official text
The exam supplies this table at the desk, so the edition it prints is the one that counts on test day.
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