Have you ever wondered how much water you can harvest from your roof during a rainstorm? While the answer depends on many variables, including air temperature, gutter system and rain harvesting system, you can get a general idea by calculating the area of your roof by the inches of rainfall.
For example, if your roof measures 100 feet by 100 feet and there has been 1 inch of rainfall, that equals over 6,000 gallons of rainwater. That's the equivalent of more than 150, 40-gallon baths!
An area of just 10 feet by 10 feet, with 1 inch of rainfall, can virtually collect about 62 gallons of water or 8 cubic feet. An acre receives 27,154 gallons of water during a rainstorm that yields 1 inch of rain and 1 square mile receives 17,378,560 gallons of water per 1 inch of measured rainfall.
The U.S. Geological Survey website provides an easy-to-use calculator to measure the amount of water a storm delivers using area and inches of rainfall. Determine how much water actually falls in a given area by feet, acres or miles. You'll be surprised how much rainwater you can harvest with just a small storm.
To learn more about this subject, check out our previous blog post, Rainwater & Harvesting Facts
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