Sizing Guidelines for Residential Water Tanks: 3 Factors to Consider

Many parts of Western Australia experience arid weather and a lack of rainfall. According to the Bureau of Meteorology, WA had only 406 mm of average rainfall last year, which is rather low compared to Australia’s overall average of 465 mm. For this reason, many West Australians, particularly those in Perth, find it not only convenient but also necessary to install water tanks in their homes. Not every home, however, has the same water requirements, which means that the size of every water tank will need to be determined before installation. Here are three factors you will need to take into account when sizing your water tank:


Water Demands

Your home’s water demands hinge on a few factors. The number of inhabitants, average consumption, range of uses, and water conservation devices are some details that need to be considered. If you get your water from the mains, chances are you are consuming about 300 to 740 litres of water per day, though this amount could be far less if water conservation measures are in place. Before you call a water tank company, determine a rough amount of your water demands and get a general idea of sizes that are available to you.

Amount of Rainfall

The amount of rainfall is different in each area. Therefore, you cannot just leave it to guesswork. As mentioned earlier, WA has a drier climate compared to Australia’s long-term average rainfall. Normally, homes in drier regions need larger water tanks to store more water in case the dry spells don’t let up for a very long time.

Roof Area

Your roof can function as your instrument for collecting rainwater. Naturally, the larger your roof’s surface area, the more water you can collect. As a general rule, smaller houses need smaller tanks. An average house has about 100 to 160 square metres of roof area, and each square metre of your roof collects 1 litre of water for every 1 millimetre of rainfall. Assuming that 50 percent of the roof can be connected to the water tank, your tank can collect approximately 800 litres of water with every 10 mm of rainfall projected.

Water is a limited natural resource that is essential to every form of life on Earth and must, therefore, be used wisely. Calculating your tank size can help you maximise your water saving capacity. Look for companies that sell different sizes of water tanks at Perth prices that are reasonable, like Rainfill Tanks and Curved Roofing Supplies.


Guidance on Use of Rainwater Tanks, Australian Government Department of Health

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