Cities & Architecture

How Official Negligence Turned a Natural Crisis into a Human-Made Catastrophe

The Tamil Nadu government failed to warn people about the deluge that swallowed Chennai

People wade through a waterlogged road following heavy rains at Porur in Chennai on Wednesday. Credit: PTI

People wade through a waterlogged road following heavy rains at Porur in Chennai on Wednesday. Credit: PTI

Chennai: Around 5 pm on the 1st of December, an official who does not wish to be identified watched as the sluice gates of the Chembarambakkam reservoir were cranked open. Word was that 10,000 cusecs of water was to be released into the Adyar river from the reservoir which was close to overflowing. “I was at Chembarambakkam seeing the huge amount being released,” the official told The Wire on Monday. “I didn’t imagine they were unleashing a deluge. I was so naive as to have thought that they would have taken the consequences into account. In fact, the next day I was shocked to hear of what happened because of the water release,” he said.

About an hour earlier, at around 4 pm the same day, journalists in Chennai received a terse warning. “Water is being released from Chembarambakkam lake at the rate of 5,000 cubic feet per second,” a press release issued by the Chennai Collector, E.  Sundaravalli, stated. “Since the inflows into the lake have increased, there is a possibility of increasing overflow to the tune of 7,500 cusecs. People living along the banks of the Adyar river are advised to move to safer areas,” it said.

A subsequent press release issued a little later requested the public not to attempt to venture near the Adyar or Cooum rivers out of curiosity and not to allow children near the banks. The statement said that the revenue department, police and fire service authorities were informing the people about this as well.

A lake in Perumbakkam breached following heavy rains, flooding neighbouring roads and an SEZ. Credit: Tirusenthil

A lake in Perumbakkam breached following heavy rains, flooding neighbouring roads and an SEZ. Credit: Tirusenthil

The flooding began that night. By the morning of the 2nd of December, most areas of Chennai within a radius of seven kilometres on either side of the Adyar river were under water. By noon that day, water had entered homes and driven people out onto the streets. In areas closer to the river, water rose to heights of 10 feet, forcing residents in areas like Defence Colony onto their rooftops.

What was conspicuous by its absence was information. Take for instance the information now available on the state government’s site. On the 1st of December, the Chembarambakkam reservoir was at 86% capacity with storage of 3141 million cubic feet as against its maximum capacity of 3645 million cubic feet. Outflow from the reservoir shows a mere 900 cusecs into the Adyar river. Recorded rainfall is 17 mm.


So which version is true? The government official who was told about the outflow of 10,000 cusecs, or the Chennai Collector’s press release stating 5000 to 7500 cusecs, or the government website that states 900 cusecs? The Wire contacted various officials in government including the Chief Secretary, the Secretary of the Public Works Department and the Chennai Collector but did not receive any answers.

Now take the reservoir data of December 2, the day of the actual flooding. As per the government site, storage levels in Chembarambakkam went up to 93% with levels hitting 3396 million cubic feet. 47.5 cm of rainfall contributed to this. Water released from the reservoir into the Adyar river was a calamitous 29,000 cusecs. In fact, say officials off the record, 29,000 cusecs of water was released at 10pm on December 1.



Curiously, there was no press release informing the media about this enormous unprecedented outflow from the reservoir. Residents report that in a few areas, the police made announcements about the likelihood of flooding using loudspeakers. But most of Chennai did not know. Caught unawares, residents were horrified to see water taking away their homes and belongings. Why did the state administration not issue any warning to the media or communicate to the public that a potential disaster was heading towards them?

“We communicate such alerts through wireless to police and other authorities like panchayat presidents in places along the river,” said S Rajaraman, monitoring officer for flood rescue and relief for Kanchipuram district. “As soon as we get information about water release, it is communicated to villages on the banks of the river. We then inform the public through the local authorities and ask them to move away,” he said. No other official responded to The Wire‘s queries on this issue. Journalists covering the floods were told verbally about the release of 29,000 cusecs of water by officials of the Public Works Department only after being questioned specifically about the quantum of water being released.

What actually caused the flood?

On digging deeper, more questions emerge. The Poondi reservoir, which empties into the Cooum river, also saw unprecedented outflows around the same time. On the 1st of December, the outflow from Poondi was at 8,552 cusecs as per the state government site. On the 2nd of December, the outflow was at 30,200 cusecs – more than that of Chembarambakkam. On the 3rd of December, Poondi discharged 36,484 cusecs, while the release from Chembarambakkam on the same day came down to 11,000 cusecs.

So why did the areas surrounding the Poondi reservoir and along the Cooum river not get flooded? Why did only the areas around the Adyar river get flooded?

A senior state government official told The Wire on condition of anonymity that heavy rainfall and overflow from various lakes into the Adyar river was the cause of the inundation. “The Adyar river’s capacity is 40,000 cusecs,” he explained. “Around 60,000 cusecs was flowing for two days, meaning three times the capacity of Chembarambakkam,” he said. The official also said the Cooum river thankfully did not flood despite high discharge from the Poondi reservoir simply because rainfall in the area was lower. “Lakes in the Porur, Tambaram and Mudichur areas flow into the Adyar river, which was already in spate,” he said. “Hence water backed up and there was a reverse flow into surrounding areas. The saving grace is that the Cooum was not flowing like the Adyar. The Cooum’s capacity is 25,000 cusecs. Less rainfall meant its flow was less. If the flow had gone up to 50,000 cusecs for instance, areas like Adyar, Kilpauk, Nungambakkam, Chintadripet and Egmore would have had a crisis. You can’t take floods in both rivers,” he said.

Environmentalists, however, say that the flood was entirely man-made, a creation of the state government. “Precipitation data has to be factored into the way reservoirs are managed,” said Jayshree Vencatesan of Care Earth, a non-profit working in the field of environmental conservation. “We cannot allow reservoirs to fill up like a bucket and then suddenly empty them. That cannot happen,” she added.

Activists also blame the huge deposits of sand and sediment that they claim blocked the flow of water from the Adyar river into the sea. “There are all kinds of encroachments on the Adyar,” said Nityanand Jayaraman, an environmental activist. “In September this year the state government laid a road on the Adyar river just for the Global Investors Meet. There is huge siltation of the river due to the dumping of sewage. This is blocking the flow of water into the sea,” he said.

Vencatesan says the Poondi outflow did not go into the surrounds of the Cooum river simply due to the presence of the protected Pulicat Lake, a swamp that absorbed the excess water. “It is very clear that wherever there are protected areas like Pulicat and Pallikaranai (another protected wetland in Chennai), they have acted as shock absorbers – taking in the water and preventing flooding,” she said. “There is no choice in front of the government now. They have to designate certain areas as no development zones. Only then can other areas be maximised for development,” she said.

Another big error made by the state government, say sources, was the release of this large quantity of water at around 10pm on the December 1. “Water should have been released by 6pm at least so that people have a chance of getting out when the flooding would have begun at around 10pm,” said the source. “It was wrong to release so much water post 10pm. Flooding began by 2am and people were stuck,” he said.

Could the flood have been avoided altogether? Was it a series of costly errors by the state government for which Chennai’s residents paid the price?

In the aftermath of a 2009 earthquake in Italy which claimed 309 lives, seven scientists of the country’s National Commission for the Forecast and Prevention of Major Risks were sentenced to six years imprisonment for “having failed to carry out their legally binding duties as public officials”. This was prompted by reassuring statements made by the Commission a week earlier which led Italians to stay indoors believing they were in no great danger. A subsequent appeal overturned the verdict for six of the scientists, upholding the sentence for only one.

As the state government now focuses on relief measures, the actual cause of the flood has been put on the backburner. Government officials and Chief Minister J. Jayalalithaa have chosen to maintain a stoic silence on the issue. The monsoon is not yet over. Tamil Nadu can only benefit from a swift commission of enquiry being set up to go into whether official apathy was behind the floods and to put in place systems to prevent a recurrence in the future.

Sandhya Ravishankar is a freelance journalist in Chennai.

  • Ganesh Sankar

    Good article..You nailed it

  • Vinita Nayar

    This is criminal negligence and people need to be put behind bars for causing loss of life and loss of property. I would like to point out one thing though – you say areas around the Cooum did not get flooded. That is not true. I live in Aminjikarai, off Nelson Manickam Rd close to the Cooum. It overflowed and entered people’s homes at around 1am. All my household help who live close to the Cooum had water entering their homes. On 2nd morning, from my 6th floor terrace, I could see the entire area around me covered with water; water had even entered the ground floor apartments in our building. Maids who live near the Cooum on Poonamalee High Rd in Aminjikarai said their huts were washed away and they were left with nothing.

  • Shrek

    wow. thanks for the informative report. its a pity that the CM has to approve every single thing in TN. we havent seen an extremely inefficient CM like jaya in TN

  • Anjali Mody

    This is a very good article. But there is one factual error: “So why did the areas surrounding the Poondi reservoir and along the Cooum river not get flooded?” When a river overflows its banks it is in flood. The Cooum in North Madras not only broke its banks but in parts flood waters rose 8 and 10 feet above the river’s higest point. It would be interesting to know how officials define a flood!

  • Giri

    Again a critical factor is being missed out. It rained heavily on November 15 and 16 and they released water that flooded the Adyar banks. And chennai faces water shortage. So they probably decided to keep the lake storage as close to full as possible. So Adyar had water in it already as opposed to being nearly dry. Thus when on Dec 2 water was released, it easily flooded. Of course, they are not used to chennai getting so much rain and lake storage. Plus the factors listed in this article made for a disaster.

  • M.S.Vasan

    The Government head the CM of the state failed to look either side but herself. She is surrounded with the chamchas who say what she wished to hear. The innocents lost their lives, many list their entirely the whole life savings. The whole state faced the calamity because of the wrong decisions by the wrong Person at the wrong TIMES.

  • Aravindan Sekar

    Both D.M.K and AIADMK are responsible for the encroachment. They are behind the real estate mafia. This is time for people like SAGAYAM I A S. TN desperate for a leader like him. Hope in few we can see him leading the state. I pray it should happen ! let those life which are lost in this disaster help this to happen as soon as possible!

  • Usman Ali K

    If you look at the google map of the bridge near MIOT Hospitals and travel north yard by yard along the western bank of Adyar River, you will find a well-known school about 50 yards from the bank of the river. How could a school ever get built there? The less said about the hospital, the better. They have blatantly encroached on the course of the Ramapuram Kaalvaai shrinking a 35 feet wide drainage channel to a mere 5 feet. The damage that this did has to be seen to be believed. There is seething and a simmering anger that may turn ugly if there are more rains.

  • Aravindan Sekar

    Chennai and cuddalore ruling party going to lose by large margin but at the end of the day whom they are going to vote for ?? Ans: ONE MORE EVIL

  • perumaal

    Now that our city is bouncing back, our first priority now
    (rather I would say it’s our responsibility) is to understand what caused this
    devastation? The happenings look such that the dam has broken and washed away
    the city. It was very hard to believe the failure of all the technologies
    (weather forecast, reservoir engineering, etc,.) that make me think as if I was
    living in 19th century. I strongly believe that the losses could
    have reduced to half if at all the authorities in place had followed the minimal
    operational and safety guidelines. The one word that answers the whole mishap
    is ‘NEGLIGENCE’.

    So it is more important for us to understand what went wrong
    in managing the rain – not to criticize the government and its officials but for
    us to be more aware and get prepared during such situations in future. The
    money and the human effort needed for creating readiness in facing the calamity
    would be one tenth of its aftermath restoration activities.

    So, we should request the state government to release a white
    paper with complete details on Chennai rain flood. It should include the forecast warnings,
    impact assessments, preventive measures undergone, efforts taken by the
    authorities to manage the water storage bodies like reservoir against the rain
    water, awareness created among public, rescue and relief works undertaken etc,.
    with clear timeline and necessary supporting documents. It should also conclude
    with recommendations that could have implemented in order to manage the
    situation better. Let the government takes its own time to collate the
    information from all its department and release it by end of Dec’15 or even by
    Jan’16. This white paper should be evaluated by experts around the world and a
    guideline for the efficient management of extreme rains specific to Chennai
    geography should be created. The fund for the evaluation work can be crowd-sourced.
    If this is not done by mid of 2016, I am
    very sure the situation would be just the replica in Dec’16. There is point in
    treating the symptoms without finding the root cause.

    Getting the government to release the white paper would be
    the toughest task, because they would never prefer to expose their faults. But
    still we should force them to do it. With those minimal and adjusted
    information, we can make a big difference and welcome the rain happily again.

  • Srikanth G

    What we sow we reap

    1. How many of us can say we follow strong professional integrity in process (how we do) and purpose (what we do) in circumstances outside a routine?
    2. How do we employ and pay the so called Government personnel who are the key inputs (tell what is happening) and actors (deliver tasks)?
    3. What kind of data and information systems we give them access to?
    4. How often you are aware (not to check read or follow ) of guidelines on long term forecasts or plans about town plan, drainage network , power or water in your city ?

    In all, we collectively place far less qualified people with little salary and meagre facility to manage our life’s and nations most long term interests. We assume they all will be perfect because we are in a high fly job as a consultant to IT and earning a lot!

    How on earth this deligence you seek is posible with the abject mediocrity and synchophancy we cultivate?

    We reap what we sow!

  • Karthik Subramanian

    Poondi Reservoir does not empty into the Cooum River. Neither is Pulicat a reason why Cooum did not experience floods. A bulk of the water was released via Adayar through Chembarambakkam, which is to the South. Some facts are wrong. Cooum flows through Central Chennai. Kosathalayar through North Chennai, and Adayar through South Chennai.

  • Peer Mohamed