Above Ground Rainwater Tanks
Want to learn more?
What is an above ground storage tank?
An above ground storage tank is the focal point of a rainwater harvesting system. It receives rooftop rainwater runoff that runs through the gutters and downspouts before collecting in the tank itself. In optimal rainwater harvesting systems, this water runs through filters in the gutters, downspouts, or both before reaching the storage container.
What are above ground tanks used for?
Above ground tanks are typically used for the following applications:
- Rainwater harvesting
- Sprinkler systems
- Non-potable household applications
- Drinking water (with appropriate filtration in place)
- Miscellaneous outdoor needs (washing cars, gardening, etc.)
What are above ground tanks made of?
The Norwesco tanks listed above are made from UV-treated, impact-modified, food-grade polyethylene. This material is a durable, strong, and long-lasting form of plastic that is ideal for storing potable water supplies. Because of its benefits over other types of plastic, polyethylene is commonly used in trash and grocery bags, packaging film, housewares, squeeze bottles, and many other food and household applications.
What size above ground tank do I need?
To size a rainwater tank, you must consider the surface area of your roof, the amount of rainfall in your region, and the volume of stored water you use. To determine how much water will be harvested each rainfall, use the following formula:
Roof size (square feet) x rainfall (inches) x 0.623 = harvested water (gallons)
For example, one inch of rainfall on a 2000 square foot roof provides about 1250 gallons of rainwater to a storage tank. The application you use rainwater for will determine the amount you use and, consequently, the size of the tank you should purchase. You will want to purchase a tank that provides enough water for your applications without running out during a normal weather cycle.
Are above ground tanks UV resistant?
Yes, high-density polyethylene offers protection against ultraviolet rays from the sun. This protection prevents the structure of the tank from becoming compromised by constant exposure to sunlight.
What are the minimum and maximum storage temperatures of above ground tanks?
If water freezes in a water storage tank, it will expand and cause the tank to crack. If you live in a cold region and wish to use an above ground tank in the cold months, you will need to insulate your tank.
The maximum storage temperature for Norwesco above ground tanks is 120 degrees Fahrenheit. Exposure to temperatures higher than this for long periods will quickly damage the tank’s structure and cause it to deteriorate.
Can above ground tanks store petroleum products?
No, Norwesco water tanks should not be used to store petroleum products. These soften the walls of the tanks and ultimately cause them to fail.
How much maintenance do above ground tanks need?
Above ground rainwater tanks should be cleaned about once a year on average. The interior of the tank should be inspected regularly for bacterial growth or excessive sediment that necessitates immediate cleaning of the tank. A plastic tank can be cleaned with unscented bleach, water, and an effective scrubbing device.
What are the installation costs of above ground tanks?
Installation for a small rain barrel can cost as little as $100, and large tank installation can cost multiple hundreds of dollars. The majority of installation costs in a rainwater harvesting system will not come from an above ground storage tank, but rather the filters in your gutters and downspouts. Gutter guards are particularly expensive, but they offer the most comprehensive protection for your collected rainwater.
What are the benefits of above ground tanks?
Compared to underground rainwater tanks, above ground tanks provide:
- Cheaper and simpler installation
- Easier relocation
- Easier access for maintenance
What are the disadvantages of underground tanks?
Above ground rainwater tanks possess the following disadvantages to underground tanks:
- More prone to theft
- Susceptible to damage from weather and other natural factors
- Inconsistent temperatures without expensive insulation
- Difficult to blend in with environment