SB 11.3.11
samvartako megha-gano
varsati sma satam samah
dharabhir hasti-hastabhir
liyate salile virat
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Hordes of clouds called Samvartaka 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.