Matsya Purana — The Greatness of the Vibhūti-Dvādaśī Vow: Pushkara
अथाभिदृष्टं महदम्बुजाढ्यं सरोवरं पङ्कपरीतरोधः पद्मान्यथादाय ततो बहूनि गतः पुरं वैदिशनामधेयम् //
athābhidṛṣṭaṃ mahadambujāḍhyaṃ sarovaraṃ paṅkaparītarodhaḥ padmānyathādāya tato bahūni gataḥ puraṃ vaidiśanāmadheyam //
Then he beheld a vast lake rich with great lotuses, its banks encircled by mire; and, gathering many lotus-flowers from there, he went on to the city known by the name Vaidiśa (Vidishā).
This verse is not about Pralaya; it is a travel/geography passage highlighting an auspicious lotus-filled lake and the onward journey to Vaidiśa (Vidishā).
By depicting the gathering of lotuses, it aligns with the householder/royal practice of collecting pure offerings (flowers) for worship, hospitality, and merit-making acts while traveling through sacred regions.
Ritually, lotus-flowers are classic offerings in pūjā and tīrtha contexts; architecturally, the mention of a prominent sarovara near a city echoes the Puranic ideal of settlements supported by water bodies (useful for Vastu-oriented site planning).