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Install RWH in your house, make Bangalore greener

Collecting rainwater is now being proven as a scientific, hygienic and economical method to bring control the rampant water shortage crisis.

Install RWH in your house, make Bangalore greener Photo: GoogleInstall RWH in your house, make Bangalore greener Photo: Google

Rainwater harvesting (RWH) or restoring rainwater
for the future has become one of the major necessities in Bangalore owing to the depleting level of water in and around the city. Renowned rainwater harvester S Viswanath says "There is stress on centralised piped supply of water to the city, surface water bodies like lakes and tanks, which were traditional sources of supply, are on a steep decline coming down from 262 in 1972 to about 82 by 1999 and the existing 82 surface water bodies are also polluted with sewage since only about 40 percent of the city is covered with underground sewage collection facilities,"

What is RWH?
The system mainly ensures a minimum of 100 days water supply for a four person household in a year. All you need to do for the conservation of rainwater is a proper management. According Viswanath, in an average rainfall year, a 100 square metre roof area would theoretically generate 97,000 litres of water and out of which about 77600 litres could be harvested assuming 80 percent capture efficiency. With a consumption of 100 lpcd for a four member family rainwater should suffice for 194 days in a year. For example, in Bangalore, with around 60 rainy days, a 500-litre rain tank fixed to a 50-square metre roof catchment can collect nearly 23,000 litres of rain in a year. This is provided the rainwater is used up every time it collects rain.

Experts speak:
With RWH has been made mandatory in the city by Bangalore Water Supply and Sewage Board (BWSSB), Bangalore has been witnessing a tremendous rise in the number of RWH installations. Viswanath says, “The number of RWH installations in the city has gone up to around 40000.”

While the rainwater harvesters coming across more and more people everybody enquiring about the details of rainwater installations, the number of installations at domestic buildings has gone up rapidly. However, Karan Manveer Singh, another expert from Biome Environmental Solutions, says, “Even though the number of queries is high, people are not opting for the best solution like before.”

How to go about installing?
One household needs to have a proper sump tank to store the rainwater. With this, one will have to install a pipeline to channel the water from the catchment area to the sump tank and maintain a clean catchment area (usually rooftop) to stay away from the bacterial growth. For installation of pipeline, you need to consult any rainwater harvester or any individual plumber.

  • A wide rooftop area would be used as the catchment
  • Roof top has to be kept clean since it tend to see bacterial growth
  • 100 sq mt surface can capture 80000 litre of rainwater in a year
  • A middle class family of four can use the harvested water for more than three months (considering an average use of 800 litre water per day)
  • One can also use the ground as catchment
  • On an average, it would cost Rs 10000 to 20000 for one household (excluding sump tank)
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For more details contact Rainwater Club at 91-80-41672790 or email:rainwaterclub@gmail.com
Tags: rainwater harvesting bangalore, rainwater club, s viswanath, install rwh

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