What is a Rainwater Harvesting?

Rainwater harvesting is the process of collecting and storing rainwater for later use. It is one of the best and eco-friendly ways to save water, especially in areas where water shortage is common. You can collect rainwater from rooftops, terraces, or open spaces and store it in tanks or underground reservoirs.

Why is Rainwater Harvesting Important?

Saves water and reduces dependency on groundwater
Helps recharge groundwater levels
Reduces water bills at home
A great solution for water shortage in summer
Good for gardening, cleaning, and even drinking (after filtration)
Eco-friendly and sustainable

Rainwater Harvesting Setup at Home

There are two common types of rainwater harvesting systems for homes:

1. Rooftop Rainwater Harvesting

This is the most popular and easy-to-install system for houses.

Steps to set up:

Catchment Area: Your rooftop or terrace
Gutters and Pipes: To collect and channel rainwater
First Flush System: Removes the first dirty flow of rainwater
Filter Unit: Removes dirt and debris
Storage Tank: Stores filtered water
Recharge Pit or Borewell Connection (optional): Sends water underground

2. Surface Runoff Harvesting

Useful if you have open areas or gardens
Water is collected from ground surfaces and directed to storage or recharge pits

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Rainwater Harvesting System Cost in India

Rainwater harvesting cost depends on the size of the house and system type:

Type of House	Approximate Cost
Small House (1 BHK/2 BHK)	₹8,000 – ₹15,000*
Medium House (3 BHK/4 BHK)	₹15,000 – ₹30,000*
Large Bungalow / Villa	₹30,000 – ₹60,000*
Commercial/Big Buildings	₹1 Lakh and above*

Pro Tip: The cost includes materials like pipes, filters, tanks, and plumber installation charges.

What Equipment is Required?

Here are the common rainwater harvesting components:

PVC/GI Pipes for channeling rainwater
Mesh to avoid leaves/debris
First flush system
Filters (sand, charcoal, gravel)
Storage tanks (plastic or cement)
Recharge pits or soak pits

Benefits of Rainwater Harvesting at Home

Saves thousands of liters of water every year
Lowers your water bill
Helps prevent waterlogging and soil erosion
Improves groundwater quality
Easy to maintain and long-lasting system
Can be done even in small homes or flats

Government Subsidy for Rainwater Harvesting in India

Yes, the government offers subsidy for rainwater harvesting systems to promote water conservation.

Some state-wise rainwater harvesting subsidies:

Delhi: Up to 50% subsidy for installing rainwater harvesting system
Tamil Nadu: Mandatory for new buildings and provides grants
Maharashtra: Subsidy under Jalswarajya scheme
Karnataka: BBMP offers subsidy of ₹25,000–₹50,000
Haryana & Punjab: Incentives for rooftop rainwater harvesting

How to Apply for Subsidy?

Contact local municipal office or water department
Submit application with building details
Get system installed and inspected
Claim subsidy post-verification

Tip: Keep all receipts and installation photos for subsidy application.

DIY Rainwater Harvesting or Hire a Professional?

DIY is possible for small homes with basic plumbing knowledge
For complex systems or filtration, it's better to hire an expert
You can consult rainwater harvesting consultants or local plumbers

How Much Water Can You Save?

A 1000 sq. ft. rooftop can collect around 60,000 liters of water per year (with average rainfall). This is enough for:

Gardening
Washing vehicles
Flushing toilets
Cleaning floors
And even drinking after filtering

Common FAQs

1. Is rainwater harvesting compulsory?

In some cities like Chennai and Delhi, it is mandatory for new buildings.

2. Can rainwater be used for drinking?

Yes, after proper filtration and purification.

3. How often do I clean the system?

Clean gutters and filters before and after every rainy season.

Final Thoughts

Installing a rainwater harvesting system at home is a smart, eco-friendly, and cost-effective solution. Whether you live in a city or village, it's a step toward saving water and reducing your monthly water bill. With government support and available subsidies, it’s now easier than ever to start rainwater harvesting.

16th, May, 2025

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