Quick Answer
Rainwater harvesting can significantly reduce utility bills by providing an alternative source of water for non-potable uses such as flushing toilets, washing machines, and irrigation systems. A well-designed rainwater harvesting system can save homeowners up to 50% on their water bills. Furthermore, rainwater harvesting systems often require less maintenance than traditional municipal water supplies.
Effective Rainwater Harvesting Systems
An effective rainwater harvesting system typically consists of a roof catchment area, a first flush device, and a storage tank. The roof catchment area should be designed to direct rainwater away from the home’s foundation and into a gutter system. A first flush device is used to prevent debris and contaminants from entering the storage tank. The storage tank should be designed to hold at least 1,000 gallons of water to provide a reliable source of water during dry periods.
Calculating Water Savings
To calculate the potential water savings from a rainwater harvesting system, homeowners should consider the amount of water used for non-potable purposes, such as flushing toilets and washing machines. According to the US Environmental Protection Agency (EPA), the average household uses approximately 30 gallons of water per day for non-potable purposes. In areas with high rainfall, a rainwater harvesting system can provide up to 90% of the water needed for these purposes, resulting in significant water savings.
Designing a Rainwater Harvesting System
When designing a rainwater harvesting system, homeowners should consider the size of the storage tank, the flow rate of the rainwater collection system, and the water demand of the household. A general rule of thumb is to size the storage tank to hold at least 1 inch of rainfall per 1,000 square feet of roof catchment area. Additionally, homeowners should consider installing a pump and treatment system to ensure the water is safe for use in the home.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.