If the slope should go to the North-East, should it run from the West toward the North-East?
Yes. Everywhere, the slope should run from the West toward the North-East, the East or the North.
Related questions
Is a nahar mukhi (lion-faced) plot auspicious if it extends toward the South so that its South-East grows?
No. A South-East or South-West extension is not auspicious, because a plot needs its North-East extended. Even in an East-facing gaumukhi plot with a narrow front where the South-East is a right angle, the North-East gets cut, so it is not auspicious. A nahar mukhi plot gives results only when its North-East is extended.
Many people build the North-East part of the floor about a foot lower. Is that right?
Yes, lowering the floor level in the North-East causes no problem.
Should all the rooms of a house, apart from the bathroom, be at the same level?
Yes, all rooms should be at one level. A slope toward the North-East causes no problem, because the earth itself is tilted about 23.4 degrees toward the North-East and following nature counts as level; a slope in any other direction causes trouble.
When a toilet and bathroom are built in the visarjan (disposal) zone, their floor is often raised or sunk to keep water from flowing out. What is correct?
Anything placed on the ground should be at water level, and the floor of the whole house should stay the same. Give the toilet and bathroom floor its slope toward the North-East; water draining toward the South-West is very troublesome.
A mango tree inside the boundary in the North-East is growing taller than the house. What effect will it have?
Only one tall tree is allowed in the North-East, the coconut, which draws cosmic energy from above and passes it down. No other tall tree should stand there. If one already exists and cannot be cut, plant energy-capturing plants such as tulsi in the North and plant tulsi all around the tree.
A wooden temple with elephant figures stands in the North-East. Is that fine?
Elephant figures should stand on something solid, not hang in the air. The temple can stay, but a temple with elephants is better placed in the West.