" RAIN IN MEASURED AMOUNTS

Another item of information provided in the Qur'an about rain is
that it is sent down to Earth in "due measure." This is mentioned in
Surat az-Zukhruf as follows:
It is He Who sends down water in measured amounts from the sky by
which We bring a dead land back to life. That is how you too will be
raised [from the dead]. (Qur'an, 43:11)
This measured quantity in rain has again been discovered by modern
research. It is estimated that in one second, approximately 16 million
tons of water evaporates from the Earth. This figure amounts to
513 trillion tons of water in one year. This number is equal to the
amount of rain that falls on the Earth in a year. Therefore, water continuously
circulates in a balanced cycle, according to a "measure." Life
on Earth depends on this water cycle. Even if all the available technology
in the world were to be employed for this purpose, this cycle could
not be reproduced artificially.
Even a minor deviation in this equilibrium would soon give rise to
a major ecological imbalance that would bring about the end of life on
Earth. Yet, it never happens, and rain continues to fall every year in
exactly the same measure, just as revealed in the Qur'an.
The proportion of rain does not merely apply to its quantity, but
also to the speed of the falling raindrops. The speed of raindrops,
regardless of their size, does not exceed a certain limit.
Philipp Lenard, a German physicist who received the Nobel Prize
in physics in 1905, found that the fall speed increased with drop diameter
until a size of 4.5 mm (0.18 inch). For larger drops, however, the fall
speed did not increase beyond 8 metres per second (26 ft/sec).57 He
attributed this to the changes in drop shape caused by the air flow as
the drop size increased. The change in shape thus increased the air
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resistance of the drop and slowed its fall rate.
As can be seen, the Qur'an may also be drawing our attention to
the subtle adjustment in rain which could not have been known 1,400
years ago.
Harun Yahya
Every year, the amount of water that evaporates and that falls back to the
Earth in the form of rain is "constant": 513 trillion tons. This constant
amount is declared in the Qur'an by the expression "sending down water in
due measure from the sky." The constancy of this quantity is very important
for the continuity of the ecological balance, and therefore, life. "

― Harun Yahya , Allah's Miracles in the Qur'an