Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
तथा निशादौ तत्कृत्वा पानीयेन प्रपूरयेत् ।प्रातर्दृष्टे जले वृद्धिः समं पंके क्षयः क्षये ॥ ५४४ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 544.
Do the same at nightfall and fill the pit with water. If water is seen in the morning, there is growth. If there is mud, the result is middling. If the water has gone, there is loss.
Simple meaning: 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.
रेखामार्गे च कर्त्तव्यं प्राकारं सुमनोहरम् ।
Build a fine wall along the marked line. Each of the four sides gets door places.