North East is the place of God and head of Vastu Purushothaman resides. This corner can be the source of water. Water can be allowed to flow into the house through this corner. Drainage water can also flow thru this area, we should always check that water flows from SW direction to the direction NE, which means SE should be higher than NE area.
Bore well can be there in the North East area and water connection line can be taken from this side. Similarly, drainage pipe can be thru this side.
North east corner should be light so overhead tank shouldn't be placed in this area.
North east area should have a better and more open space in the house, which will allow natural universal energy into the house through this side.
If your NE area is blocked by other flat or building, it'll obstruct or block the flow of natural universal energy into the house and that is not Vastu compliant area. If one side is blocked, provide more openings in the other side.