Table § 18-29-604.3


Water Distribution System Design Criteria Required Capacities at Fixture Supply Pipe Outlets

Fixture Supply Outlet Serving

Flow Rate a

Flow Pressure (psi)

Bathtub

4

8

Bidet

2

4

Combination fixture

4

8

Dishwasher, residential

2.75

8

Drinking fountain

0.75

8

Laundry tray

4

8

Lavatory

2

8

Shower

3

8

Shower, temperature controlled

3

20

Silkock, hose bibb

5

8

Sink, residential

2.5

8

Sink, service

3

20

Urinal, valve

15

20

Water closet, blow out, flushometer valve

35

25

Water closet, flushometer tank

1.6

20

Water closet, siphonic, flushometer valve

25

25

Water closet, tank, close coupled

3

8

Water closet, tank, one piece

6

20

Water closet, tank, pressure assist

3

25

For SI: 1 psi = 67.895 kPa, 1 gallon per minute (gpm) = 3.785 L/m.

a) For additional requirements for flow rates and quantities, see § 18-29-604.4.