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// CODE SNIPPET

P3004.1 DWV System Load

Residential Code 2015 of Utah > 30 Sanitary Drainage > P3004 Determining Drainage Fixture Units > 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.

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 7
2 baths 8
2.5 baths 9
3 baths 10
3.5 baths 11

For SI: 1 gallon = 3.785 L.
  1. 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.
  2. 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.
  3. Add 2 d.f.u. for each additional full bath.

Related Code Sections


P3004.1 Sanitary Drainage, DWV System Load
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. TABLE ...
Residential Code 2015 of Utah > 30 Sanitary Drainage > P3004 Determining Drainage Fixture Units > P3004.1 DWV System Load
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Building Code 2015 of Utah > 4 Special Detailed Requirements Based on Use and Occupancy > 412 Aircraft-Related Occupancies > 412.5 Residential Aircraft Hangars > 412.5.4 Independent Systems
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Joints and connections in the DWV system shall be gas tight and water tight for the intended use or pressure required by test ...
Residential Code 2015 of Utah > 30 Sanitary Drainage > P3003 Joints and Connections > P3003.1 Tightness
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