Delhi: Groundwater
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Contents |
Availability and quality of water
2000-2017: the level dips to the critical zone
From: AmitAnand Choudhary, 90% of city in critical zone as groundwater level dips, May 9, 2018: The Times of India
Could Lead To Severe Water Crisis, SC Told
The capital, already facing a severe drinking water shortage, is heading towards a more serious situation as the level of groundwater, continuously depleting in the last two decades, has resulted in 90% of the city being categorised as semi-critical or critical. Presenting a dismal picture, the Central Ground Water Board told the Supreme Court that the water level has been decreasing from 0.5 metre to over 2 metres per year at different places in Delhi and could lead to a crisis if not halted. Compiling data on groundwater levels from year 2,000 onwards, the board in its report said water levels at all its 20 monitoring stations have seen a steady decline with areas around Chhatarpur, Dwarka and the President’s Estate hit the worst. As per the report, 27% of the national capital territory’s 1,483 sq km had ground water at the level of 0-5 metres in 2010 but in 17 years this has shrunk to 11%. In 2000, ground water was available till 40 metres but at present water levels in 15% of Delhi, or around 222 sq km, have plunged to 40-80 metres. The board has placed almost all of Delhi in semi-critical or critical zones except a few pockets of west and central Delhi, which have been declared safe as per 2005-10 data. The problem might be serious in NCR because of over-exploitation of ground water for construction.
Water table exploited up to 300% in parts of Ggn
Parts of Gurgaon suffer from severe over-exploitation of water to the extent of 300%. “Analysis of long-term water level data of May 2000 to the present period reveals that over the period, in areas categorised as over-exploited as per ground water resources estimation of 2013, mostly in South, South East, New Delhi, East, North East and also parts of West and South West district, water level decline rate varies from 0.5m per year to more than 2m per year at places,” the report said.
“There are some pockets, where change in water level is not significant or remain unchanged. Such pockets of shallow and rising water level areas are diminishing over the period. As such, major part of the state is under over-exploited and semi-critical category and in such areas, water levels are showing persistent declining trend during the last two decades,” it said.
Terming the report as “startling and very serious”, a bench of Justices Madan B Lokur and Deepak Gupta said immediate steps must be taken to avert the looming crisis. The court also pointed out that even the President’s Estate was under critical zone and asked the Centre “does it mean that you are not able to provide water to the President”?
Conceding that Delhi is staring at crisis, additional solicitor general A N S Nadkarni said the government will file a response on measures to be taken to deal with the problem. He said the entire world is facing the crisis and it is widely believed that next world war might be fought over water.
As in 2017
Proposal To Ban Extraction From 1Km-Zone On Either Side Of Najafgarh Drain
The Central groundwater Board has categorised groundwater in Delhi into four zones according to availability and quality of water and issued guidelines for managing them. It has also recommended the cessation of all extraction of groundwater from a 1km-zone on either side of Najafgarh drain and from landfill and industrial sites because of the water there being highly polluted.
In its report called “Hydrogeological Framework and Groundwater Management Plan of NCT Delhi,“ released recently , CGWB has recommended extraction in Zone 1 areas, where groundwater is available at a depth of less than 8 metres below the ground. However, the report also said that many areas in this zone had poor quality water and this should be used for salt-tolerant crops or blended with clean water for non-drinking purposes.
The board said extrac tion projects should not be allowed in areas with declining water level (zone III).These included Delhi Cantonment, Vasant Vihar, Hauz Khas, Kalkaji, Chanakyapuri, Connaught Place, Punjabi Bagh, Paharganj, Preet Vihar and Vivek Vihar.CGWB has said if pumping continued at the current rate here, it would result in saline water. It has recommended rainwater harvesting and use of tertiary treated waste water for recharge of these areas.
The report warned that overexploitation was not only depleting water resour ces, but turning groundwater saline. Of the 13,491 million cubic metres (MCM) of groundwater in Delhi, 10284 MCM, or 76%, was brackish or saline. Among affected areas were Darya Ganj, Sa raswati Vihar, Punjabi Bagh, Najafgarh, Civil Lines, Defence Colony , and Delhi Cantonment. “Poor quality groundwater can be used for growing salt-tolerant crops like cotton, whe at, gaur, chickpea, soyabean, sugarcane and others,“ the report advised.
As for places abutting the Najafgarh drain, the report stated that the “presence of heavy metals has been re ported in groundwater along the drain. Therefore, groundwater in this zone is unsuitable for drinking and irrigation purposes...pesticides and bacteriological parameters have also been reported in isolated pockets.It is recommended that landfill sites should be selected after concluding hydrogeological surveys to minimise the risk of groundwater pollution“.
Shashank Shekhar, assistant professor of geology at Delhi University , who had conducted an independent study on the Najafgarh drain, pointed out, “Fluoride and even arsenic in groundwater in water samples of the Najafgarh drain can be attributed primarily to anthropogenic sources. Some heavy metals are, of course, found naturally in the environment, but they are not found in levels that are dangerous to human use.High nitrate contamination was also discovered in Timarpur, with fluoride levels above permissible limits in 20% of the samples.“
CGWB has identified a “potential aquifer zone“ along the western Yamuna canal which can yield around 5 million gallons per day (MGD) of water (the city's need is estimated to be 1,140 MGD by the 12th Five Year Approach Plan paper). The board also mapped tehsil-wise groundwater level trends between 2003 and 2013. Kalkaji tehsil showed the highest groundwater development at 277%, or much higher exploitation than the recharge capacity . It was followed by Vasant Vihar at 268%, Hauz Khas at 260% and Rajouri Garden at 232%.
2017/Mangar groundwater unfit: CPCB
Shilpy Arora, CPCB finds Mangar groundwater unfit, September 8, 2017: The Times of India
Villagers Helpless; Report Sent To NGT
The worst fears of green activists about contamination of groundwater due to flow of leachate from the defunct Bandhwari waste treatment plant have come true.Central Pollution Control Board (CPCB) has found that the groundwater in Bandhwari and Mangar villages are polluted to such a level that it is unfit for drinking. The board submitted its report to National Green Tribunal (NGT).
The green tribunal had asked CPCB in July to conduct laboratory tests of the groundwater in and around Bandhwari in the wake of a plea filed by environmentalist Vivek Kamboj in 2016. In its petition, Kamboj alleged that leachate from the solid waste management plant in Bandhwari, which has been lying defunct for the past four years, was flowing into underground aquifers, thereby contaminating the groundwater of the area.
“Nitrate in the groundwater samples from Mangar village and Bandhwari village are not complying with the drinking water standards, hence groundwater at Mangar and Badhwari villages is not fit for drinking purpose, but water can be used for bathing and irrigation purposes,“ states the report.
The board has blamed leachate formation at the defunct Bandhwari waste treatment plant for high levels of chloride, manganese, calcium and boron in the groundwater of these villages. “High values of manganese, calcium, boron and chloride content at a borewell at landfill site and a borewell at Dera village, (located) 500 metres away from landfill site are observed. Such contents... are higher than the acceptable upper limits for drinking purposes... This may be attributed to contamination of the borewells from landfill leachate,“ states the report.
While chlorides at a borewell has been found to be 888 mgl (milligrams per litre) -three times higher than the desirable limit -nitrate level at another borewell is 101.7 mgl (two times higher than desirable limit). The desirable limit of chlorides and nitrates should be below 250 mgl and 45 mgl, respectively . Similarly, highest levels of manganese, calcium and boron are 14.11 mgl, 285 mgl and 0.6 mgl, respectively . The desirable limit of manganese, calcium and boron, on the other hand, should be below 0.1 mgl, 75 mgl and 0.5 mgl, respectively .
The board also said in its report that there are chances that groundwater contamination could rise in the area. “Parameters like TSS (total suspended solids), TDS (total dissolved solids), BOD (biochemical oxygen demand), COD (chemical oxygen demand), arsenic and chloride are not complying with the discharge standards of the leachate and (it is) found that there is no proper management system for storage and treatment of leachate at the site,“ the report states.
Rainwater harvesting
Status in 2018
From: Paras Singh, 2 years on, rain centres run dry as city fails to harvest gains, May 10, 2018: The Times of India
No Takers For Consultancy Helping Citizens Install Rainwater Harvesting Systems
To popularise the idea of rainwater harvesting, Delhi Jal Board, in association with an NGO, opened three “rain centres” two years ago. Today, after a promising beginning and at a time when groundwater resources are at a dire level, these centres are barely functional.
“The three centres provided free consultancy and helped people get rainwater harvesting (RWH) systems installed, but we did not build the harvesting units,” a DJB official said. “Now, hardly anyone visits us. We perhaps get one or two visitors in a month, sometimes not even that.”
Ironically, and perhaps indicative of the general disinterest in the capital’s falling water table, RK Puram, Dwarka and Lajpat Naga, where the three centres are located, have logged among the most worrisome drop in groundwater levels. When TOI visited the centre at RK Puram, where the last recorded water level was 44 metres below the ground, it found the unit locked. The lack of importance given to the project was evident in DJB officials being asked to shoulder the responsibilities of promoting RWH, in addition to their official work, once the partner NGO, Forum for Organised Resource Conservation and Enhancement (FORCE), withdrew.
Jyoti Sharma, founder of FORCE, explained that the water utility did not renew the partnership contract when it lapsed after a year. “These were advisory centres and we charged no money to provide our expertise,” Sharma said.
To increase water table recharge though RWH, the state government has made it mandatory for owners of properties built on an area of over 500 square metres to install water harvesting systems. Non-compliance attracts a penalty 1.5 times the water bill, while those who conform get a 10% rebate on the bill. An additional 5% rebate is offered for installing an effluent treatment plant. It is also mandatory for properties above 100sqm to install these units, though violation does not lead to penalties.
“The policy encourages people to fall in line, but lack of enforcement has failed to deliver. Also, waivers, amnesties and delays in deadline for compliance have hit the scheme,” Shar ma said. DJB officials agreed that the number of existing RWH systems is somewhere in the “few thousands” but nowhere “commensurate with the number of eligible households”.
DJB has relaxed troublesome conditions such as using activated charcoal as filtration medium. But experts say more tweaking is required for the idea to catch on. “Many properties in Delhi don’t have the required built-up free area and building a rainwater pit of the specified size could even damage the foundations. A policy should be made at community/ bulk user level,” said a FORCE member.
Sudha Sinha, general secretary of Federation of Cooperative Group Housing Societies, added the societies in Dwarka were bogged down by having to get annual fitness certificates for their RWH pits. “It takes over Rs 80,000 to get two RWH pits cleaned, so the costs for a cooperative society can go up to Rs 4 lakh,” Sinha pointed out.
