Also known asroof tank
The North to North-East location of the water element means water sources such as borings, wells and tanks are made below ground level there, not as overhead tanks. Roof-top water should also drain towards the water element direction.
An overhead tank can be built anywhere from the West to the North-West; NNW and the South-West are wrong, and a tank over the staircase is best avoided.
The water element is shown by a silver or white half moon, its colour is white, its zone runs from North to North-East and its metal is silver; water bodies and mirrors represent it.
From 7:30 to 9 am the Sun sits in ESE and its rays churn (manthan), making it the zone of analysis, also called the anxiety zone. It suits wash areas, septic tanks, guest rooms, lifts and rooms of small children or research scholars, but not adult bedrooms, tijori or business counters.
The earth is tilted about 23 degrees toward the NE, so this corner receives the most energy; it is the zone of clarity. Keep it low and open, use it for water, study and worship, and keep here everything you want to charge or speed up.
NW brings prana and fresh air and pushes stale air out, so cross ventilation is a must; the teacher calls it the gateway (get-away) zone. It is a natural fridge for storing grain and the Moon's place, which makes it the ideal zone for the overhead tank.
The overhead tank belongs in the NW, the Moon's place, or in Varun's West. Most people wrongly build it in the SW, which is dry Rahu-Ketu territory with very intense infrared.
SE is pure Agneya: from 9 am to 12 noon the young Sun's fire is strong enough to cook food, so this is the ideal kitchen zone and the zone of cash flow. Water, mirrors and money storage go wrong here.
West is pure and sacred: goddesses live here, it is Shani's place, and Varun devta, the wealthiest devta, resides here with Pushpadant, so it is the zone of gain and profit. It suits bedrooms, tijori, temple and overhead tank, but must never be dug, dirtied or kept low.
The Sun sets in the West but the effect falls on WNW, which brings tears, so Vedic vastu calls it the rudan kaksh (crying room); it is the zone of depression and low mood. It is the ideal place for a septic tank and suits waste and storage uses.
From 4:30 pm until sunset the Sun's rays turn cool and soothe the brain's neurons and glial cells, so WSW is the education zone and is very good for studying children. Most activities are allowed, but no fire, toilet or main door.
Keep heavy furniture and cupboards in the South, West or SW of the bedroom, and avoid sleeping under beams or tanks, near electronics, facing mirrors or over clutter.
Rules to avoid in kitchen design: no south-facing door, no doorless or open kitchen, no central platform, no mirrors or water artifacts, no toilet on any of its six sides and no well, borewell or tank above or below.
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.
In the same places prescribed for underground and overhead water tanks; there is no separate location, whether the water is for the labour or for the owner.
Yes. Above floor level it works in the North and in the North-West, and in the North-West it can also be built high up like an overhead tank. A tank at ground floor that is raised, with no pit, is acceptable.
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.
Not in NNW. An overhead tank can be built from the West up to the North-West; making it in the South-West, as many people do, is wrong. Build it in the North-West.
Only if the stairs are in the North-West; otherwise not. Basically an overhead tank should not be built over the stairs, because hydro currents move as you walk below it and the mind becomes unsettled.
Yes. Water stored anywhere, including on the roof, represents the water element. But if the tank is built in a square shape, it moves to the earth element, because the square is the earth element's shape, and it becomes an earth combination.
No, it will not have any effect. Only the roof directly above the bedroom should not carry an overhead tank.
Paste a thin layer of muscovite (mica) on the ceiling, or give the room a wooden ceiling. Sleeping under an overhead tank generates hydro currents that raise the risk of heart problems.
It should not be underground; keep it overhead, in the West direction.