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Credit:

NASA

s Global Precipitation

Measurement Mission

Reading a Rain Gauge

Reading a rain

gauge is simple. We can look at the measurement marks on the

side of a rain

–

capturing device, and find the level of water collected from a passing

storm. Depending on what system is used where we live, we can read inches or

millimeters and say how much rai

n has fallen. But the device collects a volume of

are units of

length,

instead of in pints or liters, which are units of

volume

?

Picture a Pool

To find a volume of an objec

t, in this case rainwater, you need to know the area of

the base of the object and its height. For a rectangular rain gauge you can measure

the area of the base like this:

length x width,

and then multiply by the

height

of the

water.

volume = length x widt

h x height

Now let’s put our hypothetical, rectangular rain gauge on the grass next to an

equally hypothetical and also rectangular swimming pool. Our swimming pool is

empty. A thunderstorm rains over both of them. They both collect a

volume

of

rainwater.

The base of a rain gauge is a small area (small

length x width

); you can hold one in

your hand. During a storm, you know by looking that it will collect a small volume

of rainwater. The base of a rectangular swimming pool

is a much larger area (big

length x width

). During that same storm, the pool will collect a much larger volume of rainwater.

But what about the

height

? Does the collected water rise the same amount in the swimming pool as it

does in the rain gauge?

The a

nswer is yes. Not

convinced? Think about it

this way.

Let’s fill our rectangular

swimming pool with row

upon row of rectangular

rain gauges sitting right

beside each other. The rain

gauges in the pool are

identical to each other and

to the on

e sitting on the

grass. We roll back time and

the storm rains again.

Rain gauges collect rain,

or snow, in one spot. By

looking at the level of

water and reading the

measurement mark on

the gauge, we can see

how much has fallen over

a period of time, in a 24

–

hour day, for example.

Credit (both images): CoCoRaHS

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