It has dependably been an open mystery, examined and wrangled after the December surges a year ago. Be that as it may, now it has developed that as the city extended, more than 150 water bodies, that were a piece of a surge moderating framework in the city and its rural areas, were infringed and transformed into human residence. The outcome was there to see: Plum land wanders in Mudichur and Tambaram went submerged.
As per a study done via Care Earth Trust (a Chennai-based biodiversity research association), just 15% of the city’s wetlands are left, down from the 80% when Chennai’s range was lesser. The scientist, Prem V , has broke down the spatiotemporal varieties, uniquely focussing on wetland and developed place where there is the Chennai metropolitan territory from 1980 to 2010.
According to the discoveries, the developed territory of the city was 47.62sq.km. in 1980, just 20%, while the wetlands were spread more than 186.30sqkm (see maps). In 1991, the developed range expanded three-fold, 152.33sqkm, and practically equalled the wetland spread which in the 11 years had boiled down to 159.41sqkm.
The IT blast at the turn of the thousand years set off a development blast in the southern parts of the city to suit workplaces; and to house geeks the land business thrived in the region. Throughout the years, the city extended and edges like OMR and Perungudi changed. As concrete supplanted the bush grounds and dry lake beds, the developed zone expanded. In 2000, it was 250.58sqkm (68%) when contrasted with the 117.48sq.km. of the wetlands. After 10 years, the developed territory touched 402.10sqkm (85%) and the wetlands had contracted to 71.05sqkm (15%).
The study found that the majority of the water bodies influenced were in the southern and western rural areas. The ranges where the water bodies were infringed, some institutionally, included Tambaram, Perungalathur, Vandalur, Ramapuram, Manapakkam, Valasaravakkam, Ambattur, Alandur and Adyar. By chance, a few of these zones were hit hard by the December downpour.
As indicated by the study, cradle territories of a lake are the main losses of fast urbanization. Known as odai poramboke and yeri porambokku in Tamil – meaning waterway over a no man’s land and lake on a no man’s land individually – these cradle ranges associated lakes and emptied abundance water out of one water body into another. These channels shaped a basic part of a characteristic surge moderating framework, yet after some time, with the lakes dry, these were infringed upon, the study said. Likewise, peaceful area bordering the lakes went about as floodplains amid storm. With the channels and farmlands gone, flooding was up and coming.