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By the year 2050, the chances of floods in Chennai would be more
Posted on: 17/Aug/2018 9:22:45 AM
People of Chennai and Tamil Nadu would not have forgotten the year 2015. It was in that year Chennai city and many parts of TN were submerged under flood waters. The latest news is by the year 2050, rainfall in Chennai would be reduced by 5% and there would be more frequency of catastrophic rainfall. This was confirmed by professor Elango belonging to the geology department of Anna University.
On Thursday, 16th August 2018, Urban Ecology and Resilience conference took place. This conference was about the climatic changes and professor Elango expressed his thoughts in this conference. He spoke about how global climate change model was used and it studied the climate change pattern across the globe in grids of 25 sq km. He then added that the model was down-scaled to study the grid in which the city of Chennai fell in order to predict this pattern. This event was organised by the UN Human Settlements Programme plus AARDE Foundation.
Professor Elango threw light on the fact that the overall rainfall would come down by 5 % and the number of days rain would occur would also come down. He surprised many when he revealed that the number of massive floods, storms and other weather extremities would be increased. He later spoke about how factors like wind velocity, ocean currents and surface temperatures were studied to arrive at the results. It must be noted that 13 decades of rainfall pattern was also studied. Unless there is robust system of reservoirs, rainwater would not be stored as ground water in Chennai city as Chennai falls on a terrain formed on hard sediment. The run-offs into the ocean would be greater during heavy rains if the storage capacity of landscape was lower.
Professor Elango explained how 17 wells were taken for the study and these 17 wells were totally submerged under water during the 2015 floods. He highlighted that water present in these wells had both pollutants plus microbes. The poor quality of ground water was due to catastrophic floods.
It is now brought out that various water bodies present in Chennai city and in the state of TN was studied to see how these water bodies could be made resilient to natural calamity like floods etc. Various solutions that are coming out of this research study are building check dams and creating percolation zones in the water bodies. He ended his speech by highlighting the importance of robust system of reservoirs.
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