September 23, 2021

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Delhi Rains: Then the rain water got wasted, if we had stopped, the problem would have gone away.

 

Highlights

  • Rain water harvesting can solve the water shortage in Delhi to a great extent.
  • Since July 19 this year, it has rained close to 300 mm in only four days.
  • Due to poor planning in Delhi, about 85 percent of the rain water is wasted.

New Delhi
Due to the absence of any concrete system of rain water harvesting in the capital till date, a large amount of water is going to waste in this monsoon season in Delhi, which is facing water scarcity. In the second fortnight of July, people are troubled by the torrential rains of five days, but instead of going underground, all this water was wasted by flowing on the roads. According to experts, if measures are not taken to save rain water according to the changing pattern of rain, then the situation will continue to worsen in the coming time. It is unreasonable to expect such rains to improve the groundwater level in the existing infrastructure.

300 mm of rain fell in 4 days
This year, since July 19, there has been around 300 mm of rain in only four days. Experts say that about 120 mm of rain contains 87 thousand million liters of water. Now it has become more difficult to save this water because the intensity of rain is increasing very fast. Therefore, it is necessary to improve the infrastructure associated with storing rain water. According to an estimate by the Center for Science and Environment (CSE), the demand for water in the capital is 2765 million liters per day i.e. 644225 million liters per annum. An average person needs 175 liters of water in a day. This clearly means that if the rain water had been conserved this year, then 20-25 per cent of the water requirement in Delhi could have been overcome. Significantly, the groundwater level of the capital is going down by 0.2 to 2 meters every year.

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85 percent of the water goes to waste
The average rainfall in the capital during the four months of monsoon is 617 mm, which is much less than other parts of the country. However, according to experts, if we can use this water for recharge, then the groundwater level will not decline. According to Vikrant Tongad of SAFE, working on the environment, about 85 percent of the rain water in Delhi is wasted due to poor planning. At the same time, despite the ban, groundwater exploitation in the capital is becoming very high. The difference between the demand and supply of water during summer varies from 150 to 200 MGD. If rain water is used properly, this gap can be reduced by 70 to 80 percent. At the same time, environmentalist Divan Singh says that much attention is not being given to reviving the lakes.

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According to experts, if the rain water harvesting system is worked properly in the capital, then the capital can get 900 billion liters of water from it. At the same time, if work is done only on the roofs, then an average of 27 million liters of water can be obtained during each monsoon.

What is the problem in installing RWH system

  • It is expensive to install. Minimum expenditure of 10 to 20 lakh rupees is spent on getting it installed in the society.
  • It can be planted by selecting on waterlogged places, so that that water can go directly to the ground.
  • Arrangements should be made to transport rain water to lakes, ponds and johads so that the lakes are recharged every year.

Estimation of water requirement in master plan-2041

Year demand
2020 1140 mgd
2031 1746 MGD
2041 1455 mgd
current production 935 mgd
Demand and supply gap right now 141 MGD

 

Delhi-Water

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