SB 11.3.11

saṁvartako megha-gaṇo
 varṣati sma śataṁ samāḥ
dhārābhir hasti-hastābhir
 līyate salile virāṭ
Word for word: 
saṁvartakaḥ — of annihilation; megha-gaṇaḥ — hordes of clouds; varṣati — will rain; sma — indeed; śatam samāḥ — for one hundred years; dhārābhiḥ — with torrents; hasti-hastābhiḥ — (raindrops measuring the length of) elephant trunks; līyate — will merge; salile — in the water; virāṭ — the entire universe.
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.