What is rain and how does it measure millimeters of rain?

The rainfall index provides how many liters per square meter there has been rain. Understand how value is obtained and used

In everyday life, it is common to talk about the intensity of a to rain just like “strong” or “weak”, or whether it was a drizzle or a thunderstorm. In addition to terms like this which are not at all accurate, questions about the duration of rainfall and their geographical distribution are also important to know how much water actually fell from the sky.

• What are the types of rain?
• What is the difference between inundation, inundation and inundation?

Scientists and authorities are able to determine this value – called rainfall index – through meteorological stations distributed throughout the territory. The rainfall index is measured by a device called a rain gauge: a collection funnel that collects water and emits signals as its volume fills up.

The rain gauge measurement is made in millimeters (mm) of rainfall. When we say that, for example, it rained 10mm in one day in a certain region, it means that a box of 1 square meter of base placed there would fill with water up to a height of 10mm. If the concept is still abstract, just think that 1 mm of height in an area of ​​1 meter by 1 meter is equal to 1 litre.

How many millimeters is a lot of rain?

There is no single classification for the intensity of daily precipitation. Several municipalities in Brazil, however, take the following measures:

• Light rain: less than 5.0 mm/h
• Moderate rain: between 5.0 and 25 mm/h
• Heavy rain: between 25.1 and 50 mm/h
• Very heavy rain: over 50.0 mm/h

It is also possible to build, with data from meteorological stations, graphs called climagrams, which show the average monthly rainfall. The climagram below, for example, shows in its bars the average rainfall each month in the city of São Paulo, based on station data from the USP’s Institute of Astronomy, Geophysics and Atmospheric Sciences.

Each region of the country and the world has its own rainfall regime and its climagram. Time series like these and daily measurements of rain gauges are important for the control of water resources, in terms of water supply for the population and also for minimizing the incidence and impact of disasters such as floods and landslides resulting from heavy rainfall.

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Source: Terra

Rose

Rose James is a Gossipify movie and series reviewer known for her in-depth analysis and unique perspective on the latest releases. With a background in film studies, she provides engaging and informative reviews, and keeps readers up to date with industry trends and emerging talents.