How is inches of rain calculated

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Which might make you wonder: What does it mean when it rains an inch? How can you measure it yourself? And how much rain falls on your roof in a big storm? Those are exactly the questions we'll be talking about today.. How Is Rainfall Measured? As you probably know, rainfall amounts in the United States are typically measured in inches.

Actually, although we usually just say "inches," we really mean "inches in the storm" or "inches in the last 24 hours" or "inches in some time period. Well, obviously 1 inch of rain in a 15 minute period is a lot more water than 1 inch of rain in the last month. So we really don't know how much it's rained if we don't know the time period we're talking about. So what does 1 inch, 2 inches, or whatever number of inches of rain in some time period mean?

Well, if all the rain that falls stays right where it lands—meaning it doesn't run off and accumulate in streams and rivers and eventually in lakes and oceans, and it isn't absorbed into the ground—then 1 inch of rain in an area is enough to evenly cover the ground in that area with a layer of water 1 inch deep. I noticed on September 13 that the tree had intruded again: the end of one branch was about feet over the gauge, or slightly to the east. Runoff from this branch could have added to the total before I moved the gauge four feet to the west for the last two measurements.

It is also possible that the 0. Switching the rain gauges adds uncertainty and so does the previously-mentioned spillage when I poured the remaining water in the gauge into the tube. Also, because my rain gauge was open at the top, some of the water could have evaporated, although evaporation was probably minimal, given the high relative humidity.

Looking up from where the rain gauge was before Time 2. The tree is to the north and east. Credit: Peggy LeMone. The exposure of the rain gauge is undoubtedly the greatest source of error. Rain may be blocked by nearby obstacles causing the number to be lower than it should. Or, rain may be blown into or away from the gauge by wind gusts. The recommendation is that the gauge be about twice the distance from the height of the nearest obstacles, but still sheltered from the wind.

The gauge was certainly sheltered from the wind. It is located about 10 feet south of the house, which is about 15 feet high, and to the west of a fence and small trees as well as the tree in the photograph. This will provides the area of the rainfall.

Then, divide the volume of the precipitation by this number the area. That should give you the total rainfall amount in the unit you chose inches, centimeters, etc. This is because moisture will evaporate from your container while it sits.

Danielle Smyth is a writer and content marketer from upstate New York. By Danielle Smyth Updated September 24,