7 Great Techniques by Which You Can Easily Harvest Rainwater at Your Home This Monsoon

Did you know that if Bangalore manages to recharge even 30% of the rainwater it gets, it will have more that what the Cauvery River is supplying currently to the city, while also cutting down on the huge energy bill!

Water. So often taken for granted until those shortages hit home. This monsoon, instead of just playing the waiting game and anxiously watching the horizon, here’s how you can gather those precious drops by making your own rainwater harvesting system at home. Now is the time to become a water wise warrior!

1. Install a Rain Barrel

Install a Rain Barrel

The easiest way to harvest rain is through a rain barrel (make your own from a large trash can or an old drum) linked to a pipe fitted to collect rainwater from the rooftop and verandah of the house.To prevent the barrel from becoming a mosquito breeding ground, fasten a tight-fitting top to it, and screen the ends of the downspouts leading into the barrels. Or simply add a tablespoon of vegetable oil to the stored rainwater. It coats the water’s surface and kills larvae by depriving them of oxygen.

2. Create a Rain Garden

Create a Rain Garden

A rain garden is a sunken landscape that uses native plants, local soil, and mulch to remove pollutants from water, and allows it to percolate into the ground. It’s easy to create, looks good all year-round and has a positive impact on the environment. Here’s how to make a rain garden in your own backyard.

How does a Rain Garden Work

3. Make your own DIY Rain Chain

Make your own DIY Rain Chain

Rain chains are not only beautiful, simple to make requiring few tools and materials, but also a more attractive alternative to standard PVC (polyvinyl chloride) pipe downspouts. These fun, fashionable and environment-friendly accessories help avoid the runoff by transporting rainwater from the collecting pipe downwards to a drain or to a storage container. Check out the instructions for DIY rain chains here and decide which one would look great in your home!

4. Naturally recharge your wells and borewells

Naturally recharge your wells and borewells

Rooftop rainwater is led through pipes with a filter at the end to open dug wells for replenishing underground aquifers. Based on this idea, the ‘Mazhapolima’ (bounty of rain) Recharge Project of Thrissur was born. As a result, today, not only is there abundant water in summer, there is also reduced salinity, turbidity, and colour in the well water.

A recharge pit for borewells is also a good idea as it pushes back the surface water into the groundwater system. Usually, a recharge pit is one metre in diameter and six metres deep, lined with concrete rings having perforations. These perforations let filtered and de-silted water seep from the sides increasing the groundwater table.

5. Set up a Splash Block

Set up a Splash Block

Setting up a splash block is a great idea to divert the flowing rainwater away from the structure’s foundation.It is a piece of concrete or plastic of a roughly rectangular shape, and is placed below the downspout that carries rainwater from the roof of a house during rainfall. It absorbs the force of the water that is getting diverted from the roof, and also prevents holes from being dug in the garden due to the eroding force of the pouring water.

6. Build a Rain Saucer

Build a Rain Saucer

If you are looking for a fast DIY way to collect rainwater without much hassle, rain saucers form a great free standing rain collection system which fill up surprisingly fast. Looking like an upside-down umbrella, the rain saucer unfolds to form a funnel which fills the containers with rainwater. Since this easy-to-deploy system catches rain straight from the sky, it also decreases the chances of contamination.

7. A Reservoir for Rain

A Reservoir for Rain

Rainwater that falls on the rooftop, be it flat or slanting, can be made to run through a pipe to a storage facility like a sump or a tank. This water can be filtered to purify the larger particles before being stored in rainwater harvest (RWH) tanks. By using stored rainwater for washing cars and watering gardens, the use of underground water can be minimised. A win-win system for economy and environment, this also helps in saving energy and keeps the energy bill to a minimum.

You can know more here about the different types of RWH systems for different types of homes, as recommended by the Government. You can also visit the beautiful rainwater harvesting theme park at Jayanagar in Bangalore or the Rain Centre at Chennai where one can see several models on display and learn about different rainwater harvesting methods. A free consultation is also available with engineers at these places for a basic rainwater harvesting design. So this time, when it rains, your homes will be prepared to save and store the substance which is the lifeline to human existence itself.

India: Depleting Ground Water and Rain Water Harvesting

NASA published a report last month on India’s depleting ground water level using their twin satellites in Gravity Recovery and Climate Experiment (GRACE) program.

Highlights of the report are:

  • The north Indian states of Rajasthan, Punjab and Haryana are the worst affected with groundwater levels reducing at the rate of one metre every three years (one foot per year).
  • Ground water is pumped and consumed rapidly due to:
    • population explosion
    • rapid economic development
    • water-hungry farms
  • When groundwater is rapidly consumed, recharge to the original levels by natural process can take months or years.
  • If corrective actions are not taken, it may lead to famine due to collapse of agricultural output and severe potable water scarcity.

The map above from NASA shows groundwater changes in India during 2002-08, with losses in red and gains in blue, based on GRACE satellite observations. (Credit: I. Velicogna/UC Irvine)

One of the easiest way to recharge ground water is by implementing Rain Water Harvesting (RWH) in all

  • Residences with any type of roof
  • Shopping complex, railway stations, bus terminals, government buildings, schools, flyovers including temples, churches, mosques etc.,

Here is a recent advertisement in leading newspapers by Chennai Metro water on RWH. Also here are different types of RWH recommended by them.

Images Source: marinebuzz.com

Rain_Water_Harvesting_1 Rain Water Collection in Flat Roofs Rainwater Collection in Asbestos Roofs Rainwater Collection in Multistoried Roofs Rainwater Collection in Slope Tiled Roofs Rain Collection in Thatched Roofs

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