Rain is sent down in a measured amount and settled in the earth, and Allah could take it away.
وَأَنزَلۡنَا مِنَ ٱلسَّمَآءِ مَآءَۢ بِقَدَرࣲ فَأَسۡكَنَّٰهُ فِي ٱلۡأَرۡضِۖ وَإِنَّا عَلَىٰ ذَهَابِۭ بِهِۦ لَقَٰدِرُونَ ١٨
And We have sent down rain from the sky in a measured amount and settled it in the earth. And indeed, We are Able to take it away