A rain
gauge / Udometer / Pluviometer / Ombrometer is a type of instrument used to
gather and measure the amount of liquid precipitation over a set period of
time.
Standard
rain gauge
A
standard rain gauge consists of a funnel emptying into a graduated cylinder of
2 cm in diameter, that fits inside a larger container of 20 cm in diameter and
50 cm in height.
When
measurements are taken, the height of the water in the small cylinder is
measured. Excess water overflowed into
the larger container is measured too to get a total rainfall.
General
practice is to examine the gauge daily; to measure the water, if any; and to
enter the record at once.
Rain is
measured in units of length per unit time, typically in millimeters per
hour. One millimeter
of rainfall is the equivalent of one liter of water per square meter.
Other
types of rain gauges :
1. Weighing
precipitation gauge
2.
Tipping bucket rain gauge
3. Optical
rain gauge
4.
Acoustic rain gauge
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