Hordes of clouds called Saṁvartaka pour torrents of rain for one hundred years. Flooding down in raindrops as long as the trunk of an elephant, the deadly rainfall submerges the entire universe in water.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
सांवर्तको मेघगणो वर्षति स्म शतं समाः । धाराभिर्हस्तिहस्ताभिर्लीयते सलिले विराट्
sāṃvartako meghagaṇo varṣati sma śataṃ samāḥ | dhārābhirhastihastābhirlīyate salile virāṭ
SB 11.3.11