Matsya Purana — Characteristics of Dvāpara and Kali Yugas
अनावृष्टिहतास्ते वै वार्त्तामुत्सृज्य दुःखिताः आश्रयन्ति स्म प्रत्यन्तान् हित्वा जनपदान्स्वकान् //
anāvṛṣṭihatāste vai vārttāmutsṛjya duḥkhitāḥ āśrayanti sma pratyantān hitvā janapadānsvakān //
Struck by drought, they—distressed—abandoned their agrarian means of livelihood and took refuge in the frontier regions, leaving behind their own home provinces.
It does not describe cosmic Pralaya; it depicts a worldly calamity—drought—showing how environmental collapse disrupts society and forces displacement.
By highlighting famine-driven flight from janapadas, it implies a king’s rajadharma to secure rainfall/irrigation, maintain grain stores, relieve distress, and prevent depopulation and frontier instability; for householders, it reflects the fragility of vārttā and the need for prudent reserves and community support.
No direct Vāstu/ritual rule is stated; indirectly, it underscores why stable settlements (janapadas) require water management—tanks, wells, canals—often emphasized elsewhere in Purāṇic civic and temple-endowment contexts.