IIT Madras researchers proposes a wall to prevent floods in and around Chennai
A team of researchers at IIT Madras has come up with a way to minimise the flood risk in and around Chennai.
Indian Institute of Technology (IIT) Madras Researchers have done a study on flooding in and around Chennai. They have proposed the construction of ‘Straight Training Walls’ at the mouth of Ennore Creek in order to minimise the flood risk significantly on its upstream. The study focused on extreme storm surge scenarios and high tide levels along with flooding in the river. It found that heavy siltation in the creek mouth and narrow opening in the mouth posed a flood threat to the areas adjoining the river.
The study showed that straight training walls at the creek mouth and some regular de-silting of the river will improve the situation and minimise the flood risk significantly in North Chennai. It also showed that an alternative proposal of curved training walls proposed earlier will worsen the situation, by blocking the free exchange of Seawater with the creek, thereby, increasing the flood risk.
The Study was commissioned by Kamarajar Port (formerly Ennore Port) in Chennai to propose solutions to reduce flooding around Kosathalaiyar riverbanks. It was undertaken by Professor. K. Murali, Prof. S.A. Sannasiraj, and Prof. V. Sundar, faculty in the Department of Ocean Engineering, IIT Madras.
Elaborating about their proposals to construct ‘straight training walls,’ Prof S.A. Sannasiraj, Department of Ocean Engineering, IIT Madras, said, “Based on the expertise and experience of the Department of Ocean Engineering, IIT Madras, the Researchers working with the training of river mouths, the proposal has been made to construct a pair of training walls extending perpendicular from the shore up to a water depth of -5m on either side of the creek.”
Further Prof V. Sundar, Department of Ocean Engineering, IIT Madras, said, “A straight structure with sufficient crest height is essential to ensure the tidal prism ingress for flushing. Further, in the event the shoreline south of southern training wall reaches its tip, either dredging or its further extension into a water depth of 6 to 7m is feasible with ease. Further, the straight training walls would act in complement with the present series of groynes which were designed by IIT Madras for shore protection too.
The comprehensive report of IIT Madras examined different possibilities of extreme event cases both from the land and the Sea. The studies reveal that it could lead to an overflow in the region of elevation lesser than 2.71 m with respective MSL. A detailed study for the Adyar and Cooum estuaries will also be taken up for investigation by IIT Madras.
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