Choose location Maximum annual collection (litres)

Roof / Collection area (m2) Collectable rainwater (minus 20% estimated loss)

No. of people in the house No. of toilet flushes

Avg. flushes / person Litres / flush Avg. 4.42 flushes / person at 5 litres each

Washing machines cycles / day Litres / cycle Avg. 60 litres per wash cycle

Dish wash cycles per day (if used) Litres / cycle Avg. 10 litres per wash cycle

Garden size Avg. per day

Pool size Avg. daily loss in litres

Daily demand Annual demand

Tank 1 Tank 2