Chennai Floods

Six Chennai maps spanning over a century explain why the city faces flood danger each year

Many of the city’s lakes have been swallowed up by real-estate developments and government projects.

Over the past week, heavy rains have lashed the city of Chennai, bringing back painful memories of the December deluge in 2015 that left more than 300 people dead.

On October 30, the North East monsoon hit Tamil Nadu with a bang. Schools were shut for most of last week, and the state government issued a notice asking private companies to allow their employees to work from home.

On November 2, after six hours of incessant rainfall, several areas in southern and western Chennai were waterlogged. Fearing a repeat of the 2015 floods, more than 10,000 residents of low-lying areas took shelter in 114 relief centres in Chennai, Kancheepuram, Tiruvallur and Nagapattinam, the Tamil Nadu government said.

Despite the efforts of Chennai authorities to prepare for the monsoon by desilting rivers and building storm water drains, many low-lying residential areas find themselves under a few feet of water ever year.

The reason is simple. Most of these low-lying residential areas were once lakes.

A comparison of the 1909 map of Madras, the 1970 Survey of India map and a contemporary Google map shows how the city’s lakes have disappeared over the past century.

The Long Tank

Map of Madras, 1909. Source: Maps from the Imperial Gazetteer of India (Volume 1-24) via Wikimedia Commons
Map of Madras, 1909. Source: Maps from the Imperial Gazetteer of India (Volume 1-24) via Wikimedia Commons

Today, there is no trace of the large water body marked on the map as the Long Tank. Over the past hundred years, densely populated neighbourhoods have been built on this lake, including Thyagaraya Nagar – known for its jewellery and sari shops. These areas now constitute central Chennai.

Vyasarpadi Tank

Vyasarpadi Lake. Source: Map of Madras, 1909 and Google maps.
Vyasarpadi Lake. Source: Map of Madras, 1909 and Google maps.

The erstwhile Vyasarpadi tank in northern Chennai now houses the Dr Ambedkar Government Arts College, as well as the homes of the poor in BV Colony and Saliman Colony. Traces of the tank can be seen in the Survey of India map of 1971. But in the present day map on Google Earth, the Vyasarpadi tank has entirely disappeared.

Velachery Lake and Adambakkam Lake

Velachery Lake. Source: Survey of India map, 1970 and Google maps.
Velachery Lake. Source: Survey of India map, 1970 and Google maps.

Parts of Velachery and surrounding areas were inundated by several feet of water during the floods of 2015. The neighbourhood continues to face water-logging and traffic jams every year, including this monsoon. A glance at the Survey of India map of 1970 shows that this is hardly surprising. Today, only a sliver of the lake still exists. The two Adambakkam lakes are not evident any longer.

Katteri Lake

Katteri Lake in Kotturpuram. Source: Survey of India map, 1970 and Google maps.
Katteri Lake in Kotturpuram. Source: Survey of India map, 1970 and Google maps.

In the 1970 map of Chennai, a lake called Katteri can be seen just below the winding Adyar River. Today, along this lake lies the Tamil Nadu Science and Technology Centre as well as the Tamil Nadu Electricity Board office of Taramani area.

Kodungaiyur Lake

Kodungaiyur Lake. Source: Survey of India map, 1970 and Google maps.
Kodungaiyur Lake. Source: Survey of India map, 1970 and Google maps.

The Kodungaiyur Lake of North Chennai no longer exists. In its place is Muthamizh Nagar, consisting of tightly-packed houses of the Tamil Nadu government housing board project.

Konnur Tank

The ground floors of many houses in SIDCO Nagar, which was developed on the Konnur tank, were submerged during the 2015 flood. While many parts of the city went under water in December, this area in Villivakkam of western Chennai faced intense water-logging through the month of November itself. The areas surrounding the lake frequently face flooding every year.

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