Quick Answer
When adding bulk storage for collected rainwater, use a food-grade, 1,000-gallon or larger tank with a UV-resistant liner, and ensure it's elevated 1-2 feet above the surrounding ground to facilitate gravity-fed drainage and prevent contamination. Regularly inspect and maintain the tank, gutter system, and roof catchment to prevent debris accumulation and ensure optimal water quality.
Tank Selection and Placement
When choosing a storage tank for your rainwater collection system, consider the volume of water you aim to collect and the space available for installation. A 1,000-gallon tank is a good starting point for most residential applications, but larger tanks (up to 5,000 gallons or more) can be used for more extensive collection systems. Ensure the tank is elevated 1-2 feet above the surrounding ground to facilitate gravity-fed drainage and prevent contamination.
Gutter System Design and Maintenance
A well-designed gutter system is essential for efficient rainwater collection. Use 3-4 inch diameter gutters with a 1/4 inch screen to capture debris and prevent clogging. Clean the gutters every 2-3 months during peak collection seasons to ensure optimal water flow and prevent overflow. Consider installing a first flush device to divert the first 10-20 gallons of roof run-off, which may contain contaminants and debris.
Roof Catchment and Water Quality Management
A roof catchment is a critical component of a rainwater collection system, as it collects and directs rainwater into the storage tank. Ensure the roof catchment is free of debris, dirt, and pollutants to maintain optimal water quality. Regularly inspect the roof catchment and clean it as needed to prevent contamination and ensure the collected water is safe for use. Consider implementing a water treatment system, such as a sedimentation tank or UV filter, to further improve water quality.
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