Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 11
Sanskrit:
संवर्तको मेघगणो वर्षति स्म शतं समा: ।धाराभिर्हस्तिहस्ताभिर्लीयते सलिले विराट् ॥ ११ ॥
ITRANS:
saṁvartako megha-gaṇovarṣati sma śataṁ samāḥdhārābhir hasti-hastābhirlīyate salile virāṭ
Translation:
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.