Canada
Demand at Individual Water Outlets
Each fixture in a water supply system represents a certain demand of water. The table below can be used to indicate the normal supply requirements of common fixtures.
| Fixture | Flow rate | Minimum Supply Pressure | ||
| (gpm) | (l/min) | (psi) | (kPa) | |
| Aspirator | 2,5 | 10 | 8 | 55 |
| Bathtub faucet | 5 | 19 | 8 | 55 |
| Bidet | 2 | 7,5 | 4 | 28 |
| Combination fixture | 4 | 15 | 8 | 55 |
| Dishwashing machine | 4 | 15 | 8 | 55 |
| Drinking fountain jet | 0,75 | 3 | 8 | 55 |
| Laundry faucet 1/2″ | 5 | 19 | 8 | 55 |
| Laundry machine | 4 | 15 | 8 | 55 |
| Lavatory faucet, ordinary | 2 | 7,5 | 8 | 55 |
| Lavatory faucet, self closing | 2,5 | 10 | 8 | 55 |
| Shower head | 5 | 19 | 8 | 55 |
| Shower, temperature controlled | 3 | 10 | 20 | 138 |
| Sink 3/8″, 1/2″ | 4,5 | 17 | 8 | 55 |
| Sink 3/4″ | 6 | 23 | 8 | 55 |
| Urinal flush valve | 15 | 56 | 15 | 110 |
| Water closet with flush valve | 35 | 132 | 25 | 170 |
| Water closet with gravity tank | 2,5 | 10 | 8 | 55 |
| Water closet with close coupled tank, ballcock | 3 | 11 | 8 | 55 |
Adding up the numbers to cover all fixtures in a system would give the total demand when all fixtures are used at the same time. This is almost never a realistic situation for a supply system. A reasonable estimate must be made based on the simultaneously demand of the fixtures.