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Because they measure how deep the rainfall is, they are not measuring the volume of the rain. The depth is measured because it is not important to know the total amount of rainfall that falls, because an area of indeterminant size is not so much affected by the total amount of water that falls, but the amount of water that falls on an area of given size, which is best represented by the depth of the moisture.

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10y ago
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Nakakande Faridah

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7mo ago
L want short answer
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13y ago

On each square metre of ground a certain number of litres fall. If 1 liter falls, that's 1000 cm3 per 100x100cm2, that is 0.1cm3 per cm2. That is, on each square cm the water stands 1mm deep. It is easier to say "1 millimeter of rain, than "1 liter per square meter". In any dish with vertical sides, that amount of rain would give you 1 millimeter depth. And depth of water worries people the most.

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12y ago

because it fell downward and extreme can be known in inces upto the souce or its origin.

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12y ago

because that is the unit we use

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Q: Why is rainfall measured in mm and not milliliters?
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