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The water distribution system shall be designed, and pipe sizes shall be selected such that under conditions of peak demand, the capacities at the fixture supply pipe outlets shall not be less than shown in Table 18-29-604.3.
Fixture Supply Outlet Serving | Flow Rate a | Flow Pressure (psi) |
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.