Matsya Purana — Division of Bhārata-varṣa
संकल्पपञ्चमानां तु आश्रमाणां यथाविधि इह स्वर्गापवर्गार्थं प्रवृत्तिरिह मानुषे //
saṃkalpapañcamānāṃ tu āśramāṇāṃ yathāvidhi iha svargāpavargārthaṃ pravṛttiriha mānuṣe //
But as for the āśramas—reckoned as five by intention and inner resolve—when they are followed here according to proper rule, human endeavor in this very world proceeds for the sake of heaven and for apavarga (liberation).
This verse does not address pralaya directly; it focuses on human spiritual discipline—how regulated life-stages (āśramas) guide a person toward svarga (heavenly merit) and apavarga (liberation).
It frames pravṛtti (right worldly engagement) as legitimate when done yathāvidhi—according to dharmic rules—so a householder (and by extension a king who embodies social dharma) should uphold prescribed duties to generate merit (svarga) while also supporting conditions conducive to liberation (apavarga).
No specific Vāstu or iconographic rule is stated here; the ritual takeaway is the emphasis on yathāvidhi—performing prescribed disciplines and rites in the proper manner within one’s āśrama to attain higher aims.