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P3004.1 DWV System Load
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The load on DWV-system piping shall be computed in terms of drainage fixture unit (d.f.u.) values in accordance with Table P3004.1.
DRAINAGE FIXTURE UNIT (d.f.u.) VALUES FOR VARIOUS PLUMBING FIXTURES
| TYPE OF FIXTURE OR GROUP OF FIXTURES | DRAINAGE FIXTURE UNIT VALUE (d.f.u.)a |
| Bar sink | 1 |
| Bathtub (with or without a shower head or whirlpool attachments) | 2 |
| Bidet | 1 |
| Clothes washer standpipe | 2 |
| Dishwasher | 2 |
| Floor drainb | 0 |
| Kitchen sink | 2 |
| Lavatory | 1 |
| Laundry tub | 2 |
| Shower stall | 2 |
| Water closet (1.6 gallons per flush) | 3 |
| Water closet (greater than 1.6 gallons per flush) | 4 |
| Full-bath group with bathtub (with 1.6 gallon per flush water closet, and with or without shower head and/or whirlpool attachment on the bathtub or shower stall) | 5 |
| Full-bath group with bathtub (water closet greater than 1.6 gallon per flush, and with or without shower head and/or whirlpool attachment on the bathtub or shower stall) | 6 |
| Half-bath group (1.6 gallon per flush water closet plus lavatory) | 4 |
| Half-bath group (water closet greater than 1.6 gallon per flush plus lavatory) | 5 |
| Kitchen group (dishwasher and sink with or without food-waste disposer) | 2 |
| Laundry group (clothes washer standpipe and laundry tub) | 3 |
| Multiple-bath groupsc: 1.5 baths 2 baths 2.5 baths 3 baths 3.5 baths | 7 8 9 10 11 |
For SI: 1 gallon = 3.785 L, 1 gallon per minute = 3.785 L/m.
- For a continuous or semicontinuous flow into a drainage system, such as from a pump or similar device, 1.5 fixture units shall be allowed per gpm of flow. For a fixture not listed, use the highest d.f.u. value for a similar listed fixture.
- A floor drain itself does not add hydraulic load. Where used as a receptor, the fixture unit value of the fixture discharging into the receptor shall be applicable.
- Add 2 d.f.u. for each additional full bath.
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