Maybe we are not aware that 1 mm rainfall in Jakarta means that Jakarta gets 132000 fully loaded water wagons


How can?
What is called rainfall depth is rainfall volume divided by its area. Let's chek the formula:

     -------------------
       h = V/A
     -------------------

where,

       h             =  rainfall depth (mm)
       V             =  rain volume (mm^3)
       A             =  area (mm^2)


One important note is, because rainfall depth is the proportion of rainfall volume and  area, in same rain event, despite the area has different width, the rainfall will have the same depth. Because the depth is always same, different area results in different volume.


So what does 1 mm depth rainfall mean for us?

When 1 mm rainfall fills 1 m-square area, where it is not become a run-off, absorbed, or evaporate, its volume is 1 littre. Here how we get that:

     => 1 mm x 1 m x 1 m
     => 0,001 m x 1 mˆ2
     => 0,001 mˆ3
     =>  1 liter



Hence if the 1mm rainfall fill 2 m-square land, its volume is 2 littres, and so forth.

According to Wikipedia, Jakarta covers 661,52 km-square or 661.520.000 m-square area. When whole Jakarta has once an identical 1 mm rainfall, we get 661.520.000 littres rain water.

Have you ever imagine how much is 661.520.000 litters of water?
If we fill that 5000 littres-capacity-water wagon, we will need:

     =>661.520.000 liter / 5.000 liter
     =>132.304

It means that we need 132.304 water wagons to collect our 661.520.000 littres water from the rainfall.

Image source : here

A water wagon is about 9-meter long. If we put our 132.304 water wagons in a line, the length will be 1190,7 km. This is equal to the distance between Jakarta and Sumbawa, a city in West Nusa Tenggara Province.

Isn't it something amazing, from only 1-mm rainfall, it can fill water wagon along Jakarta to Sumbawa.





How almighty the universe creator is.

(Translated by AS)

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