Roof Catchment Calculations
- Light to normal = rain 1 sq m x 1mm of rain + 1 Litre
- Heavy rain = 1 sq m x 25mm of rain = 25 Litres
Average Household Water Usage Calculations:
- Toilet flush – dual single flush 5 litres 1.1 gallons
- Toilet flush – dual full flush 10 litres 2.2 gallons
- Bath 100 litres 21.9 gallons
- Shower (10 minutes) 200 litres 43.9 gallons
- Dishwasher load 50 litres 10.9 gallons
- Washing machine load 150 litres 32.9 gallons
- Drinking, cooking, cleaning per person per day 10 litres 2.2 gallons
- Hand basin per use 5 litres 1.1 gallons
- Garden sprinkler per hour 1000 litres 210.0 gallons
- Garden drippier per hour 4 litres 0.9 gallons
- Car washing with hose 200 litres 43.9 gallons
- Hosing driveway 100 litres 21.9 gallons
- Brushing teeth with tap running 5 litres 1.1 gallons
