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Frequently Asked Questions

How much Rainwater can a Rainwater Collection System Collect?

The amount of rainwater which can be collected varies by the type and size of the collection system used. Rain barrels typically hold 50 – 55 gallons per barrel. A rainfall of ½” on a 1,000 sq. ft. roof will fill one barrel. Concrete and plastic storage tanks range in size from 250 gallons to 15,000 gallons.

Arch chambers, milkcrate and plastic modular systems are only limited by the length, width and depth of the area as well as the void space of the system. For example, arch chambers provide only 40 – 50% space for water whereas Rainstore3 provides 96%. Therefore, each 1 meter piece of Rainstore3 holds up to 25 gallons, even though it’s only 4” high. At the maximum depth of almost 8’, 24 units of stacked Rainstore3 can hold almost 600 gallons of water in a single stack.