How is Rainfall calculated?

Answer 1

The standard raingauge is 203mm in diameter (8" in the old measure). This is the exact diameter of the top of a funnel. Water falling in the funnel runs down into the bucket below in which it is collected. The measuring glass is a calibrated tube about a quarter the diameter of the funnel. This exaggerates the vertical depth of the water allowing the depth to be read with great accuracy - 0.2mm or 100th of an inch (one point on the old scale).

The depth of the rainfall is what is measured, not the volume. By measuring the depth, it can be extrapolated to an area to calculate the volume of water that has fallen on an area. If you have 20mm of rain falling on a roof of 200sq metres, that will put 200 *.02 or 4 cubic metres of water in a collection tank.

Answer 2

Rainfall Calculator

Answer 3

The instrument is called a rain guage. A standard rain guage has a collector which may be a funnel attached to a long measuring tube. The cross sectional area of the collector is amplified 10 fold in the tube so 10 inches of rainfall in the tube would be 1 inch of rainfall. Because of this amplification rainfall amounts can be made when the rainfall is as small as one-hundredth of an inch. Anything less is called a "trace". I should add that the "standard guage" is just one of at least three types of precipitation measuring instruments.

Answer 4

Especially when a rain event will be accompanied by thunderstorms, there is a calculation called the "rainfall rate per hour".

Thunderstorms are known causing torrential downpours (that is, very heavy rains), so the severity of those "torrential downpours" during rain-producing thunderstorms can be calculated by the rainfall rate.

A rainfall rate of 1/2" per hour is a garden-variety thunderstorm; anything 1 1/2" per hour or higher is a torrential downpour, and from 2" per hour or above, it is a "flash-flood-producing" downpour.

Answer 5

Rainfall is calculated or measure by a rain gauge. A rain gauge is a tube with measurements on it that has an opening on top to let the rain drops fall into it. Here's everything you would want to know about a rain gauge:
http://en.wikipedia.org/wiki/Rain_gauge

Answer 6

Rainfall is not calculated but actually measured by an instrument called rainguage every three hours in all the observatories throughout the world at the same time.

Answer 7

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Precipitations of snow or rain is predicted and measured in millimeters over a certain period of time. The size of the container used doesn't matter. An average precipitation on earth is about 5 mm per hour. It rains a bit less than one meter per year, as an average on earth. It means that all oceans, lakes and even outside swimming pools rise by a bit less than one meter each year. But it also means that all oceans, etc. evaporate by exactly the same amount each year because what comes down must first go up! ;-)

Answer 8

Rainfall is typically measured using a rain gauge. It is expressed as the depth of water that collects on a flat surface, and is routinely measured with an accuracy up to 0.1 mm or 0.01 in.

Answer 9

total rainfall= rainfall depth x area

Answer 10

in inches