Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
समगर्तारत्निमात्रं खनित्वा तत्र पूरयेत् ।अत्यंतवृद्धिरधिके हीने हानिः समे समम् ॥ ५४३ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 543.
Dig a pit one aratni (cubit) in size, then fill it back. If there is more earth, growth is very great. If less, there is loss. If equal, the result is middling.
Simple meaning: Dig a small pit and refill it. Extra earth means growth, less earth means loss.
तथा निशादौ तत्कृत्वा पानीयेन प्रपूरयेत् ।
Fill the pit with water at night. Water in the morning means growth. No water means loss.
एवं लक्षणसंयुक्तं सम्यक् क्षेत्रं समीक्ष्यते ।
A plot with these signs is good. To find directions, draw a circle in the middle.
द्वादशांगुलकं शंकुं स्थाप्येक्षेत्तत्र दिक्क्रमम् ।
Set a 12-finger stick in the circle to find directions. Make the plot square.