Water CalculatorWCTaps (Other)Taps (Kitchen/Utility)BathsDishwashersWashing MachinesShowersH2O softenersGreywaterRainwater

Installation Type | Unit of Measure | Capacity/Flow rate (1) | Use Factor (2) | Fixed use (litres/person/day) (3) | Litres/person/day = [(1)x(2)] + (3) (4) |
---|---|---|---|---|---|

WC (single flush) | Flush Volume (litres) | 4.42 | 0.00 | ||

WC (dual flush) | Full flush Volume (litres) | 1.46 | 0.00 | ||

Part flush Volume (litres) | 2.96 | 0.00 | |||

WC (multiple fittings) | Average effective flushing Volume (litres) | 4.42 | 0.00 | ||

Taps (excluding kitchen/utility room taps) | Flow rate (litres/min) | 1.58 | 1.58 | ||

Bath (where shower also present) | Capacity to overflow(litres) | 0.11 | 0.00 | ||

Shower (where bath also present) | Flow Rate(litres / minute) | 4.37 | 0.00 | ||

Bath Only | Capacity to overflow(litres) | 0.50 | 0.00 | ||

Shower Only | Flow Rate (litres/minute) | 5.60 | 0.00 | ||

Kitchen/Utility room sink taps | Flow rate (litres/minute) | 0.44 | 10.36 | ||

Washing Machine | (Litres/kg dry load) | 8.17 | 2.1 | 0.00 | 17.157 |

Dishwasher | (Litres/place setting) | 1.25 | 3.6 | 0.00 | 4.5 |

Waste disposal unit | (Litres/use) | 3.08 | 0.00 | ||

Water Softener | (Litres/person/day) | 1.00 | 0.00 | ||

(5) |
Total Calculated use (litres/person/day) =SUM(column 4) | ||||

(6) |
Contribution from greywater (litres/person/day) | ||||

(7) |
Contribution from rainwater (litres/person/day) | ||||

(8) | Normalisation factor | 0.91 | |||

(9) |
Total internal water consumption = [(5)-(6)-(7)]x(8) (litres/person/day) | ||||

(10) | External water use | 5.0 | |||

(11) |
Total water consumption (Building Regulation 17.K) =(9)+(10)(litres/person/day) |

©Water Research Centre Limited 2023 |