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How Much Is an Inch of Rain Really?


Two inches is two inches…right? Wrong. When it comes to rain, volume’s one thing that’s easy to forget. When we consider the recent hurricane in Houston or even the rainfall in New Orleans during a summer storm, we can forget that the area of the rainfall affects just how “big” an inch of rain really is.

If 6 inches of rain falls over New Orleans (about 18 miles), then roughly 2 billion gallons of water fell over the city. If we reduce the area to 10 miles, then only 1 billion gallons account for the same inches of rainfall.

WWL-TV, Part of TEGNA Local Louisiana

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