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20 Liters per cubic meter of rain? 
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#1
Feb710, 03:34 PM

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A weather report for Chiclayo Peru said we received 20 liters per cubic meter of rain yesterday. How many inches of rain would a New York weather report say we received? Thanks.
Tom 


#2
Feb710, 03:45 PM

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P: 6,068

The report (as you stated) can't be translated. If it were liters per square meter, then you can calculate the height. Assuming my interpretation, you have 2x10^{4} cc of rain on an area of 10^{4} sq cm.
This gives a height of 2 cm, approx. 0.8 in. 


#3
Feb710, 04:28 PM

P: 31

I just saw the report again and they did say 20 liters per cubic meter (which has caused widespread flooding here). But intuitively the figure you arrived at of 0.8 inches feels in the ball park. It fell in a 24 hour period and given conditions here could have caused the flooding. Thanks for your response.
Tom 


#4
Feb810, 01:26 AM

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P: 3,535

20 Liters per cubic meter of rain?
It doesn't make much sense to measure the height of a flooding rain in terms of cubic units. 


#5
Feb810, 09:43 AM

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#6
Feb810, 10:07 AM

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#7
Feb810, 12:10 PM

P: 31

You folks are correct...this internet article just showed up:
"Rains fell on Tumbes during 21 hours, leaving 35.4 liters per square meter, that turned streets into rivers, but fortunately caused no personal injuries, according to Civil Defense reports. Chiclayo (Lambayeque) also suffered intense rains during six hours, that flooded the main avenues and affected some roads connecting to Cajamarca region." Thanks for the responses. Tom 


#8
Feb810, 11:47 PM

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The public is only interested in a measurement of flooding that is simple to understand. 20mm rainfall makes sense as we only care how high the flooding is going to get. 20 L/m^{3} is less intuitive and only makes us have to do unnecessary mental calculations to convert this into something more understandable. Of course we would get used to accepting the magnitude of such floods as 20L/m^{3} as we have with other nonintuitive measurements such as kilometres/hour, but again it's not a necessity to make these changes. Also, what if the flooding were very intense and were to become over 1000mm? We would instead have something like 1500 Litres/metre^{3} and this makes even less sense. 


#9
Feb910, 03:06 AM

P: 986

0.8 inches is not that much. The area near my house got 5 inches in 4 days a few weeks ago. It was wet, but there were no major disruptions.



#10
Feb1210, 03:31 PM

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#11
Feb1210, 06:39 PM

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#13
Feb1210, 11:59 PM

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