Rainwater tanks have plenty of benefits to offer. You can use the collected rainwater for watering your garden, washing your car, cleaning your driveway, and many more. You can also use it for toilet water, washing machine, or for your hot water. Rainwater tanks lessens the stormwater runoff from your property. It decreases the water volume flowing towards drainages, creaks, streams, and rivers. In short, rainwater tanks help you not only reduce your environmental impact by saving water, but they also help reduce your water bill.
If you’re interested in getting a rainwater tank, here’s our guide to help you decide which one is best suited for your needs and your property.
What size rainwater tank should I get?
The size of the rainwater tank depends your personal rainwater needs in addition to your roof area and the annual average rainfall in your region. A wider roof area collects more rainwater so it will need a bigger sized tank. Regions with more rainfall in a year would need a tank that can hold more water volume.
Also keep in mind the seasonal nature of rainfall in your region. For example, Ipswich, as most of south east Queensland, receives significantly more rainfall during the summer months compared to the winter months. Depending upon what you’re planning on using the water for you may want to consider having a considerable size reserve to see you through the drier months.
The formula to compute for your tank size is the following:
Annual rainfall (mm) x Roof surface (sqm) = Tank size
You can get your region’s annual rainfall data in the Bureau of Meteorology website. Otherwise, you can also consult your tank supplier to determine the right size for your tank.
Plastic vs Metal Rainwater Tanks
Plastic rainwater tanks are popular as they are durable and affordable. You don’t have to worry about material corrosion. They’re easy to clean and to repair as well. There are several colours and designs too. You can choose which will be compatible with your house’s colour and natural surroundings. Plastic tanks have UV inhibitors to withstand exposure to sunlight. But despite this, it slowly degrades over time. Its lifespan is approximately 15-20 years.
On the other hand, metal rainwater tanks are made with flat-rolled or corrugated metal. They are either galvanised or coated. A plastic inner lining protects the water quality and prolongs the lifespan of the tank. They are also stylish and look good with homes made with similar material or appearance. However, metal tanks are vulnerable in coastal areas. It can be exposed to saltwater spray which can speed up corrosion. Proper installation should be done to ensure that the metal rainwater tank is protected. Its lifespan is estimated to last up to 25 years.
What shape rainwater tank should I get?
There are different shapes of rainwater tanks you can choose. But it sometimes depends on where you will be installing it.
The most common shape is the round tanks which can be tall or squat types. These tanks are ideal for under deck or spacious areas. There are also oval, rectangular, and slimline rainwater tanks.
Slimline tanks are usually preferred for narrow spaces. If you have a spacious area for your tank and you experience frequent rainfall, you can choose rectangular tanks that can hold more water.
Above or below ground rainwater tank?
Above the ground rainwater tanks are easier to maintain and generally will not need water pumps. While below ground rainwater tanks, are common in high-density residential areas. The tanks used are usually made from concrete or poly materials.
Concrete tanks have internal reinforcements that enables it to support heavy loads. Poly tanks are also reinforced to withstand a considerable weight. Underground tanks are usually installed under the driveway. Poor installation can cause the concrete to crack and repairs can be quite expensive.
We hope you have a much better idea of what rainwater tank you will choose that is best suited for your needs. We highly recommend a licensed plumber for your tank installation. Call now to get your free quote.