ALL WEATHER TANKS RANGEAll All Weather Tanks are made to the Highest Australian Standards from Food Grade UV20 Polyethylene. Our sizes allow you to choose the right tank for your needs and the size of property where the tank is being installed. WHAT SIZE TANK IS RIGHT FOR ME?With the restrictions on water usage the bigger the tank the better, as you will be able to collect the most water possible but you are also limited by space. To best determine which tank will best suit your needs identify a location where you would like to have your tank installed and measure the length of that area against the wall, it would also help if the location has access to a downpipe to be able to feed water to your tank. Now based on that measurement pick the tank below that fits (you will need to add 100mm to the tank length and width to allow for a concrete base):
HOW MUCH RAINWATER WILL MY TANK COLLECT?
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All Weather 2000 
On average for every 1mm of rain that falls on your roof 1 Litre of rainwater will be collected from a 1m2 area of roof. So once you have worked out which down pipe will feed your tank you need to calculate the surface area of the roof that will feed that down pipe. Simply multiply the width x the height of the roof to give you a calculation. This will give you the surface area and the Litres per Millimeter of Rainfall collected. So if your roof is 40m wide by 4m high then your roof will collect 160L of rainwater for every 1mm that falls. To see the average rain fall in your area click on the link below to visit the Bureau of Meteorology and select your local area to see the average rainfall over the year.