Matsya Purana — Lineage of Yayāti through Yadu and the Deeds of Kārtavīrya Arjuna
एष वेगं समुद्रस्य प्रावृट्काले भजेत वै क्रीडन्नेव सुखोद्भिन्नः प्रतिस्रोतो महीपतिः //
eṣa vegaṃ samudrasya prāvṛṭkāle bhajeta vai krīḍanneva sukhodbhinnaḥ pratisroto mahīpatiḥ //
In the season of the rains (the monsoon), the ocean indeed takes on this surge: as though playing, it swells up in delight, and, O king, its currents run back against their usual course.
It does not directly describe Pralaya; rather, it notes a seasonal (monsoon) intensification of the ocean, whose swelling and counter-currents can be read as a natural sign of turbulent waters—imagery that later Puranic narratives also use when speaking of great floods.
By addressing the listener as “mahīpati,” it frames practical awareness: a ruler (and by extension householders) should heed seasonal changes—especially monsoon-driven sea surges and reverse currents—for safety, travel, coastal planning, and protection of settlements.
Architecturally, it implies caution for coastal construction and timing: monsoon conditions can reverse currents and increase wave-force, so site selection, drainage, and sea-facing protections should account for prāvṛṭ-season surges (a common concern in Matsya Purana–style Vastu guidance).