Quick Answer
To create a rainwater collection system with a storage tank, start by installing gutters and downspouts to capture rainwater from the roof, then direct it into a first flush device to remove debris and contaminants. The clean water flows into a storage tank where it can be used for irrigation, toilet flushing, or washing machines. Regular maintenance is essential to ensure water quality and longevity of the system.
Designing the System
When designing a rainwater collection system, consider the roof catchment area, the size of the storage tank, and the desired water use. A general rule of thumb is to use a storage tank with a capacity of 1,000 gallons for every 20 feet of the house’s roof area. For example, a 2,500 square foot roof would require a 125 gallon tank. The tank’s material should be durable and resistant to corrosion, such as food-grade polyethylene or stainless steel.
Installing the Storage Tank
Before installing the storage tank, ensure the site is level and secure. A concrete foundation or a wooden platform can be used to support the tank. The tank should be positioned at least 1 foot away from any walls, to allow for easy maintenance and inspection. The tank’s inlet and outlet valves should be easily accessible for regular cleaning and testing.
Maintenance and Testing
To maintain the water quality and the system’s overall performance, it’s essential to regularly inspect and test the system. Check the first flush device for proper function, clean the gutters and downspouts, and test the water for pH, turbidity, and bacterial contamination. It’s also recommended to perform a 1-year inspection of the storage tank to check for any signs of leaks, corrosion, or damage.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.