Rain Water Harvesting in Bangalore
Catch the Rain
Turning Nature’s Bounty into Amazing Savings
Rain Water Harvesting
Rain Water Harvesting for Homes
Imagine a world where every storm is not a disruption, but a homecoming.
Before pipelines and pumps, our ancestors knew how to store its own water. Rainwater harvesting is a return to that quiet wisdom—capturing each drop as it falls, guiding it back into the ground, and preserving a resource that is as ancient as it is essential.
Rainwater harvesting is about not letting a single drop go to waste. What falls on your roof and land is gently collected, stored, and returned to use—reducing dependence on borewells and tankers, while quietly replenishing the groundwater beneath your property.
Why get rain water harvesting for home?
90% of water used in at homes isn't used for drinking.
That’s right. Almost all of the water that you pay for, isn’t used for drinking, it is mainly used for bathing, washing clothes, washing dishes, washing your car, flushing your toilets and watering your plants, among other uses.
While the water you use needs to be clean, it doesn’t have to be potable water (Drinking water).
Rain is a great source of water, since it is naturally soft and free of chemicals.
A modern rain water harvesting system – collects, filters and stores rain water, which can be used directly for all non drinking purposes.
Rain water harvesting is a smart one-time investment that pays for itself by replacing expensive, treated water with a free local source.
What are the benefits of rain water harvesting?
Investing in a rainwater collection system is a strategic move that turns a seasonal weather event into a predictable economic asset. Here are three reasons why you should opt for rainwater harvesting for your home.
Savings
When you source most of your water for free, you can cut down on your water bills dramatically.
Increased Property Value
A house that has a source of free water is highly sought after, with buyers willing to pay a premium for the peace of mind it brings.
Peace
No more water tankers, no expensive sources of water, no need to worry about municipal water supply, most of the water you need is something that you get for free.
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What are the components of a Rain Water Harvesting System?
Here is how we can turn a downpour into a money saving system.
In short, all the rain water that would other wise literally go down the drain, is filtered and stored for non drinking use.
Catchment
We identify regions of the house which could serve as collecting rain water, like roofs and balconies.
Channels
Once the catchment areas are identified, we install channels to guide water to the filtration system.
Filtration
We set up a robust filtration system to eliminate suspended particles, leaves and other contaminants.
Storage
Construct a pit to an agreed depth, to store water which is secured by cement rings.
Access Nature's Free Source of Water
Create Your Own Water Supply
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Respect
Our work is a promise — to the earth that feeds us, the hands that build, and the people we serve.
Knowledge
From the texture of the soil to the rhythm of the rain, our knowledge is the accumulation of three generations of learning
Access Nature's Free Source of Water
Create Your Own Water Supply
F.A.Qs
Yes, it’s mandatory for buildings with a site area of 2400 sq ft and above, and for new constructions on sites of 1200 sq ft and above. Additionally, for plots measuring 60×40 and above, installation and use of harvested water (for non-potable purposes) is mandatory. Even smaller plots (like 30×40) are required to install rain water harvesting systems, though usage might not be mandatory.
Generally, rainwater collected from rooftops is not directly safe to drink due to potential contamination from debris, pathogens, and pollutants picked up from the roof. It requires additional treatment like boiling, UV filtration, or carbon filtration to make it potable. If you are looking to use it for drinking purposes, we suggest to get the water tested before use. However, we discourage using this water for drinking.
The amount depends on your rooftop area and the amount of rainfall. A rough estimate in kilolitres can be calculated as: (Rooftop area in sq meters) x 0.9 (runoff coefficient) x (Annual rainfall in meters). Bangalore’s average annual rainfall is around 787 mm (0.787 meters). For example, a 100 sq meter roof could potentially harvest around 70,830 litres annually.
- Cleaning the catchment area(roof) and gutters regularly.
- Emptying the first flush deviceafter the initial rain.
- Periodically cleaning or replacing filters(every 2-3 months for some filters, 6 months for sand/gravel).
- Annual checks of the system.
- Cleaning the storage tankevery few years (around 10 years is sometimes recommended for well-filtered systems).
Yes, you typically need a mechanical pre-tank filter to remove debris. For drinking water, you’ll need more advanced filters like carbon filters, microscopic filters, or disinfection methods (UV, chemical). Common filters include mesh filters, sand-gravel filters, and PVC pipe filters.
- If you lack space for a storage tank, focus on groundwater recharge. Options include:
- Recharge wells:Directing filtered rainwater into open wells or specifically constructed recharge wells to replenish the groundwater table.
- Recharge pits:Creating pits filled with pebbles and sand to allow rainwater to percolate into the ground.
- Surface runoff harvesting: Diverting rainwater from paved areas and small streams into underground reservoirs or surface storage for later recharge.
- Combination:You can also use a small sump to collect filtered water before directing it for recharge.