Rainwater Harvesting in India

Why is Rainwater harvesting important in India

Water is one of the foremost important natural resources on the earth. Water may be a limited source in the future.  Can you imagine a day without water?  Which Indian city will run out of water first? We use water for multiple uses. You know it well. One of the Most important uses of water is for drinking purposes. Ground water level is decreasing drastically. It is very important for us to save water. Rainwater harvesting is the best method to save water and use it during a shortfall of rain so you don’t run out of water.

Let’s understand Rainwater Harvesting in India. Water Harvesting is a process or a technique of collecting rainwater, storing it, and using it for our purpose. Rainwater storing in a systematic way to use in the future for needs is called rainwater harvesting – RHW. In this article you will understand the importance of rainwater harvesting. How to save water using rainwater harvesting methods. Water is a valuable natural source of our life.

Table of Content

Why is rainwater harvesting important in India

Advantages of rainwater harvesting

Disadvantages of rainwater harvesting

Methods of rainwater harvesting in India

Rainwater Harvesting in Indian Cities / Districts

Most commonly questions asked regarding Rainwater Harvesting.

Due to the shortage of rainfall in certain parts of the country, people face a huge water crisis. Water can be stored but not in all parts of the country. Due to limited resources and lack of awareness and technology. Rainwater harvesting is the most effective way to store water and use it in the future to prevent water shortage. It is very important to harvest rainwater. One of the main reasons for storing water is to avoid a water crisis.

Why is Rainwater Harvesting Important in India,
Water crisis – dry

The water crisis in Indian cities

India is a developing country. Some parts of cities are facing a huge water crisis that affects millions of people’s lives. Most of the water crises appear in south India. Many cities in India have no groundwater. Few major cities in India face a lot of water crises. Those are Nagpur, Chennai, Mumbai, Jaipur, Lucknow, and Bhatinda. To stop water shortage, Rainwater Harvesting Important in India.

Water harvesting is always the best idea to save water for future use. Lets’ see what are the advantages of rainwater harvesting.

1 Free natural source of water

You don’t pay for free natural water. By harvesting the water you can cut down the water bill. Also, you can save a lot of water for future use.

2 Multipurpose use of Rainwater harvesting

Harvested water can be used for many other purposes. Eg for pouring water into the garden. Washing cars, bikes, for other cleaning purposes. And if you purify the water you can use it for drinking as well.

3 . Water harvesting Long-lasting life.

Once you set up the rainwater harvesting it lasts up to 10 Years.

So these are the Advantages of rainwater harvesting.

Although there are many good benefits of water harvesting, some of the disadvantages of rainwater harvesting are.

1 Unpredictable rain.

Well, we can’t accurately predict the rainfall so it’s a disadvantage of rainwater harvesting. Sometimes limited rainfall or huge rainfall. It completely depends upon nature. Rainwater harvesting could be critical in areas where it is short of rainfall.

2 Initial Set up cost is High

The initial cost was high to set up Rainwater harvesting. Depending upon the storage, technology, and equipment that you use that cost much at starting.

3 Regular rainwater harvesting Maintenance.

You have to maintain the harvesting system regularly. You need to take care of cleaning the tank. Check pipeline and rooftop rainwater harvesting filter. If it’s damaged or broken you will have to set up a new one.

4 Limited storage capacity.

Rainwater harvesting Storage Tanks capacity is limited. Collected water can be stored in large tanks till its capacity. Collected water in initial rainfall does not last until the next rainy season if you have limited storage capacity.

There are two most common methods of Rainwater Harvesting. 

1 Surface Runoff Rainwater Harvesting Method

2 Rooftop Rainwater Harvesting Method

rooftop rainwater harvesting system
Rooftop Rainwater Harvesting System

Surface Runoff Rainwater Harvesting Method

Let’s look at this method. Different types of water Harvesting methods use as per geo-location and need. Mostly in urban areas people use the Surface Runoff Rainwater Harvesting Method. There are many names for this method; it can be called overland flow or landscape method. A significant amount of water is absorbed into the soil. Surface Runoff Rainwater Harvesting Method is to Collect and store water into a large or good capacity tank and to use in the future. Surface Runoff is a very good and simple method. This method is less cost-effective than other methods. Surface Runoff Rainwater Harvesting Method is a very easy way to store water.

Rooftop Rainwater Harvesting Method

This type of method is used to collect and store rainwater from the roof of a house or building.  Rooftop Rainwater Harvesting Method is involved in the process. Components rooftop rainwater harvesting system.

  1. Catchments
  2. Transportation
  3. First, flush
  4. Filter

The catchment is a process of collecting the water directly from rainfall for rainfall harvesting purposes. It can be from the roof, terrace, etc.

In the Transportation process collected water is transported or carried into a tank via pipe or some kind of equipment. Water can be carried down through a small gutter as well.

The first flush is very important to flash out the water received from the first rainfall to avoid contamination. 

The last one is Filter. Rooftop rainwater harvesting filters play an important role in water harvesting. There are different types of filters available to make things work, But the Most commonly used filter is the charcoal filter. This filter is made in situ or a drum. Pebbles, gravel, sand, and charcoal. These were the rooftop rainwater harvesting system.

Below is the list of the top ten Cities / Districts of Rainwater Harvesting in India. According to the Ministry of Jal Shakti Government of India Top, ten states rank in Rainwater harvesting in India.

RankDistrict – State Name
Rank wise District and State Name’s Table for Rainwater Harvesting In India

Tamilnadu State has the majority of rainwater harvesting in the top ten national rankings. There are three district shows in the top ten national ranks. An interesting fact is you can collect around 600 Gallons of water in a 1000 Square foot Area.

Rainwater Harvesting in India

What is the short form of Rainwater Harvesting?

Answer – RHW is a short form of Rainwater Harvesting.

Is it worth it to have rainwater harvesting?

Answer – It’s always the best solution for those locations where there is a shortage of rainfall. RHW will help them save and use water.

What can you use rainwater harvested for?

Answer: Harvested water can be used for multipurpose. Cooking, Toilets-Bathing and Flushing Toilets, Lawns, Fire protection, Cleaning, and many more.

Can we drink Harvested rainwater?

Once you purify the rainwater you can drink it. Water purifiers kill bacteria and germs.

Which Indian city has the most water crisis?

Answer : City Chennai  State Tamilnadu

How many liters are in a Gallon?

Answer One Gallon is 3.78541 Liters of water. Ten gallons is 37.8541 Liters of water.

What are the techniques used in Rainwater Harvesting in India?

1 Surface Runoff Rainwater Harvesting
2 Rooftop Rainwater Harvesting

Rainwater harvesting RAW is the solution to the water crisis in India. Best option to save water for future use. The water Resource department WRD of India provides a subsidy for about 2.5 Lakh Indian rupees. The Urban area is leading in rainwater harvesting.


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