FAQS - Rainwater Collection & Storage
What capacity rainwater tank will I need?
How much rain water will I capture?
What type of base is required for positioning a water tank?
Can I drink the water tank water?
What is a first-flush diverter?
What is a leaf guard or leaf catcher?
Will the rainwater tank system require maintenance?
What will a rain water tank system cost?
What capacity rainwater tank will I need?
There is no general rule on capacity. The tank selected will depend on the space you have available (or are willing to make available) and the purpose for which you are installing a rainwater tank. Generally 3000-5000 litres will give a good supply for watering a moderate-sized garden. At least 5000 litres is recommended if you are considering plumbing internally.
Any amount of rainwater stored and used helps to reduce the demand on our potable mains supply water. Storing rainwater will ultimately reduce your water usage charges as well as help conserve this precious resource.
How much rain water will I capture?
As a general rule, for each square metre of roof area entering your tank water catchment, each 1mm of rain will result in one litre of water in your tank.
For example: 50 sq. metres roof area x 5mm rain = 250 litres captured.
What type of base is required for positioning a water tank?
The choice of base is dependant on the property site and to an extent on individual choice.
Concrete - either construction of a reinforced concrete slab or leveling an existing concrete area. Concrete is the hardiest option and highly recommended on sloping sites.
Pavers may be chosen if they complement the surrounding landscape. May not be suitable for larger tanks depending on the paver material weight-bearing properties.
Crusher dust - generally the least expensive option and a sturdy base provided that the crushed rock is properly retained and compacted. Sometimes referred to as 'road base'.
Tank stand - some tank manufacturers supply specifically engineered metal tank bases to suit particular tank sizes. Custom-built tank stands are available but are subject to engineering specifications due to load bearing requirements and are often comparatively expensive.
In some cases, the property may already have a level concrete or paved area which will accommodate a tank and therefore no base construction will be required.
Can I drink the water tank water?
Most rainwater tanks destined for the urban market are produced to a 'food grade' standard. However, you should consider factors such as the roofing material, debris collected on your roof, air-borne pollutants and the possibility of any other unintended 'additions' to your tank water supply. Tank water should always be filtered before drinking but again you should consider the type of filter and what particular contaminants are being removed. Most Government bodies do not recommend drinking urban tank water.
What is a first-flush diverter?
A first-flush diverter is recommended in order to minimise debris from the roof entering the tank. It works by diverting the first flow of water from the roof into a chamber. When the chamber is full, the flow will be directed into the tank. This device empties itself of contaminated water and resets automatically but does require periodic cleaning.
What is a leaf guard or leaf catcher?
A leaf guard or leaf catcher (also known as a rain head) is a device inserted into the guttering downpipe to prevent leaves and larger debris from travelling all the way through the tank inlet pipe. This is particularly recommended in situations where the roof receives a high level of leaf debris. If not prevented in this way, the leaves may eventually block the tank inlet strainer and/or inlet pipe and result in a back-up of water overflowing from the tank inlet or roof guttering.
Will the rainwater tank system require maintenance?
It is recommended that you periodically check you roof and gutters and tank system components for build up of debris and any signs of deterioration. Blocked tank inlet/outlet strainers can lead to a back-up of water and lead to overflow from the tank inlet. Regular maintenance protects your investment and ensures the quality of your tank water.
Water Tactics provides a comprehensive tank maintenance service which is recommended on an annual basis, particularly at the beginning of the storm season. Visit our tank maintenace page for more information.
Depending on the water quality features installed, there may be a gradual build-up of 'sludge' at the bottom of the tank. It is recommended that tanks are 'de-sludged' every 2-3 years (or as required). Water Tactics can also assist in this area. Visit our tank cleaning page for more information.
What will a rain water tank system cost?
Because there are so many variables it is difficult to give a estimated price without numerous disclaimers. At Water Tactics, we aim to find the best solution for you and pride ourselves on our personalised service. That is why we offer an OBLIGATION FREE site visit and provide a detailed quote so that you can compare exactly what you are getting for your money.
You will find us competitive in price but not compromising on the quality of our work.
Information contained on this page is of a general nature and does not purport to be a difinitive or comprehensive guide