Quick Answer
For a rainwater collection tank, the best materials are food-grade polyethylene or fiberglass, which are durable, resistant to corrosion, and safe for storing potable water. Stainless steel tanks are also a good option, but they tend to be more expensive. Consider a tank with a minimum thickness of 0.4 mm for optimal durability.
Selecting the Right Tank Material
When choosing a tank material, consider factors such as durability, corrosion resistance, and safety for storing potable water. Food-grade polyethylene tanks are a popular choice, as they are resistant to chemicals and safe for drinking water. They also offer excellent UV resistance, which is essential for outdoor applications. Ensure the tank is made from a material with a minimum thickness of 0.4 mm to prevent punctures and cracks.
Considerations for Tank Capacity and Sizing
A rainwater collection tank’s capacity should be determined by the roof area, annual rainfall, and household water use. A general rule of thumb is to size the tank to collect at least 1,000 gallons of water per 1,000 square feet of roof area in areas with moderate rainfall. This will provide a minimum of 6 months of storage, assuming an average household water usage of 50 gallons per day.
Additional Tank Features and Considerations
In addition to selecting the right tank material, consider factors such as tank shape, size, and accessories. A rectangular tank with a minimum capacity of 1,000 gallons is a good starting point. Consider adding features such as a first flush device, which allows debris and contaminants to be diverted from the tank, and a screen or mesh to prevent mosquito breeding. Ensure the tank is properly installed and regularly maintained to prevent contamination and ensure optimal performance.
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