Los Angeles has an average rainfall of 15 inches. If you multiply 15 inches by the length and width of the capturing device (in inches) you should be able to get an estimate of water in cubic inches. For example if you had a 20 by 30 foot roof you would have 240 in x 360 in x 15 in = 1,296,000 cubic inches of water. This would add up to 5610.389 gal of water. Of course some of this would evaporate and you probably would not be able to capture all of it, so the final number would be a bit smaller. I’ve attached a link to convert cubic inches to liquid gallons. Hope this helps!
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