Matsya Purana — Description of Gomedaka and Puṣkara Dvīpas; the Lokāloka Boundary; Ocean Tide...
उदयतीन्दौ पूर्वे तु समुद्रः पूर्यते सदा प्रक्षीयमाने बहुले क्षीयते ऽस्तमिते च वै //
udayatīndau pūrve tu samudraḥ pūryate sadā prakṣīyamāne bahule kṣīyate 'stamite ca vai //
When the Moon rises in the east, the ocean is continually filled and swells. When the Moon wanes—indeed, in the dark fortnight—it diminishes; and it also diminishes when the Moon has set.
It does not describe Pralaya directly; it presents a regular cosmic rhythm—lunar rise, waning, and setting—governing the ocean’s swelling and recession, illustrating orderly cosmic regulation rather than dissolution.
By highlighting predictable lunar–ocean cycles, it supports practical governance and household planning—timing travel, coastal works, fishing, trade, and ritual observances connected with lunar days (tithis) and water management.
Architecturally, it implies awareness of tidal behavior when planning settlements, ghats, ports, or temples near coasts/estuaries; ritually, it reinforces the importance of lunar phases for water-related rites and calendrical timing.