Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 10
Sanskrit:
स्थूणास्थूला वर्षधारा मुञ्चत्स्वभ्रेष्वभीक्ष्णश: । जलौघै: प्लाव्यमाना भूर्नादृश्यत नतोन्नतम् ॥ १० ॥
ITRANS:
sthūṇā-sthūlā varṣa-dhārāmuñcatsv abhreṣv abhīkṣṇaśaḥjalaughaiḥ plāvyamānā bhūrnādṛśyata natonnatam
Translation:
As the clouds released torrents of rain as thick as massive columns, the earth was submerged in the flood, and high ground could no longer be distinguished from low.