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. The minimum flow rate and flow pressure provided at fixtures and appliances not listed in Table 18-29-604.3 shall be in accordance with the manufacturer's installation instructions.
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 Section 18-29-604.4.
(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 6)