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Rain Barrel How-To: Harvest Roof Runoff with a Calculator

A guide to building a rain barrel system to capture roof runoff. Includes an interactive Rainfall Harvest Calculator: enter roof length, width (draining section only), and rainfall in inches to estimate gallons collected. The article emphasizes the value of rainwater harvesting for garden irrigation, reducing municipal water use, and managing stormwater. The calculator helps size barrels and predict yield.

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