Water in the Northeast

In Lesson 1.2 we met water in the north-east as part of the sacred-corner story — the Ishanya kept light, clean and open. Here we widen the lens to the entire water system of a home: the source (well, borewell, underground sump), the heavy store (the overhead tank), and the path rainwater takes across the plot.

Vastu's prescription is consistent and worth stating plainly. Underground water and its source go toward the north-east: the well, the borewell, the sump. The heavy overhead tank goes toward the south-west or west. And water, in general, is said to flow from the high south-west toward the low north-east.

That is a tidy diagram. Our job is to ask, for each piece, what is doing the work — gravity and shade, or convention. We will leave waste-water drainage and toilet placement to Lesson 2.4; this lesson stays on the water you want to keep clean and cool.

There is genuine physics under the north-east rule — but it is contingent. The north-east is the lightly-built, shaded corner (Module 1.2), so an underground store tucked there sits under cooler ground and stays cooler for longer. That is a real, if modest, thermal benefit.

The stronger logic is topographic. On a plot that genuinely slopes down toward the north or north-east, rain and surface run-off gather there by gravity. That makes the NE a natural low point — exactly where you want to collect and harvest water and recharge the groundwater. Historically, with the source upslope and clean, the NE was the freshwater zone of the home.

But notice the if. On a flat urban plot fed by municipal supply and lifted by pumps, the gravity argument largely evaporates — you can pump water uphill into any corner — and a buried sump under a concrete podium is not meaningfully cooled by a corner that no longer shades anything. The rule is sound where the land earns it, and decorative where it does not.

The second rule sends the heavy overhead tank to the south-west or west. There is a real but secondary point here. A full water tank is heavy — a 1,000-litre tank is a tonne of water — and concentrating that mass over the already heavy, tall south-west corner is consistent with Module 1.3's mass logic. Some also argue, reasonably, that parking the bulky tank in the SW keeps the cool, open NE clear.

The trouble is that an overhead tank cannot float to wherever the compass prefers. Where it actually sits is decided by structural engineering: the column grid, the beam spans that can carry a point load, and — crucially — the position of the staircase, lift or plumbing shaft that the water has to drop through. Plumbers want the tank above the bathrooms and kitchen to feed them by gravity with the shortest, simplest runs.

So treat the SW-tank rule as a soft preference, not a law. If the SW corner happens to carry a structural pier and sits over the wet rooms, by all means honour it — it costs nothing. If chasing the SW means a long, leaky, low-pressure plumbing maze, the engineering wins.

Strip away the symbolism and one practice survives every test: collecting rainwater at the plot's natural low point and recharging the groundwater. Where the land slopes to the NE, the Vastu low-point and the hydrologist's low-point are the same place, and the well-or-recharge-pit-in-the-NE rule becomes simply good water management.

This is climate logic you honour for free, and increasingly it is also law — many Indian municipalities mandate rainwater harvesting on new plots above a certain size. Sizing a recharge pit, leading roof and surface run-off to it, and keeping that collection zone clean and unbuilt is sound hydrology whether or not anyone draws a mandala over it.

The honest move is to let the actual survey drive the harvesting layout. Find where water already wants to go on your specific plot, collect it there, and if that coincides with the NE, enjoy the agreement. If your plot slopes the other way, follow the water — not the chart.

A tidy diagram — but each piece earns its own verdict.