How much rain has to fall to fill your rain barrel(s)?

What size is your rain barrel gallons
How many rain barrels are there
Dimensions of house left to right

front to back

(your house is ??? square feet)
Portion of roof emptying into rain barrels
(enter as decimal, not fraction--half the roof would be .5)
Rainfall needed to fill barrels ??? inches

National Oceanic and Atmospheric Administration

Check the weather maps at the National Oceanic and Atmospheric Administration's National Weather Service website. This map shows forecasts normally updated every hour. Click here.
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