Do these boring and underground tank rules apply to farms too?
Yes, the same rules apply to farm land.
Related questions
Fire is the enemy of water. What can be done if the water source of a house lies in the South?
Remedies for such anti-element placements are taught later, in the remedy classes. First learn each element, its zone, its friends and its enemies; the corrections for a water source in the wrong zone come when the course reaches remedial vastu.
We live in a housing society and do not know where the boring or septic tank is. Will it still affect us?
Yes. Not knowing makes no difference: the sun gives its rays whether or not someone believes in it, and a person who knows nothing of vastu still gets its doshas. A wrongly placed tank, boring, septic tank or sewer line affects the residents whether they know about it or not.
Why do an underground water tank, drawing room, puja room and conference room suit Shikhi (E1)?
When Adi Prabhu (Shiva) did sadhana on Kailash, the friction produced heat that began to melt the mountain, so water matters most for cooling this place; Shikhi's energy stored with water also spreads through the house and keeps removing about 50% of its vastu doshas. In the drawing room the family sits as if in sadhana and makes its plans and policies, and in a conference room others are convinced with one's ideas and vision and given targets. Worship of Adi Prabhu (Shiva) in a puja room here raises the energy further; an office and a borewell also suit this pad.
A South boring was abandoned and a new one dug in the right place. How should the old pit be closed permanently?
Put five haldi, five supari, panch ratna and a silver swastik into it, then fill it completely with sand.
A house has its entry in the Agni kon (South-East), an underground water tank in the South-East with the stairs over it, and the slope running to the South. The family fights constantly. What is the remedy?
Either leave the house or treat it: close the South-East underground water tank immediately and correct the slope. The staircase can stay. An overhead tank in the South-East is acceptable.
Are an underground water tank and a septic tank the same?
No, there is a world of difference between them, and they follow different rules and locations.