Water Catchment Calculator

How much rainwater can you harvest?

Need help selecting which tank is right for you? Use our water catchment and water usage calculators below to make your selection easier!

SUMMARY
LITRES PER DAY—
LITRES PER YEAR—
RAIN HARVESTED—
TANK SIZE—

Not sure of your average annual rainfall?
• Use BOM’s Climate Data Online (find a nearby station, check “Mean rainfall”).
• Or see BOM’s rainfall maps (set to “Average annual”).
• For capitals, see city climate stats.
Example: Sunshine Coast Airport ≈ 1500 mm/year.

Assume the tank can fill 3 times per year (depends on rainfall and usage).

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Minimum Tank Size

Note: Minimum tank size is based on the assumption that no mains water supply is available.

Indoor Usage

ActivityAmount (per day)Daily (L)Yearly (L)
Shower (15 L/min)
Bath (150 L)
Dishwasher (30 L/load)
Front Load Washing (80 L/load)
Top Load Washing (100 L/load)
Brushing Teeth (5 L/min)
Drinking/Cooking (10 L/person)
Hand Basin (5 L/use)
Toilet Flush (6 L)
Toilet Half Flush (3 L)

Outdoor Usage

ActivityAmount (per day)Daily (L)Yearly (L)
Garden Sprinkler (15 L/min)
Car Wash (200 L)
Hosing Surfaces (15 L/min)
Drip System (6 L/hr)
Filling Pool (L)
—
TOTAL LITRES PER ANNUM

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